diff --git a/README.md b/README.md
index 498118b..e7a87fe 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Main advantages of this library:
 1) Universal abstraction with misc. implementations
 2) Support of multiple exports at once (`MultiMonitor`)
 3) Scala API
-4) Scala Effect API (cats-effect 3) - If you need cats-effect 2 you can use version 2.9.x of this library.
+4) Scala Effect API (cats-effect 2 and 3)
 
 The entry-point into the library is the interface `Monitor`. Your classes need to get an instance of a monitor which they can use to construct different metrics, e.g. meters, timers or histograms.
 Instances of the individuals metrics can be used to monitor your application.
diff --git a/build.sbt b/build.sbt
index f27d7d3..ed7178a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -29,6 +29,7 @@ lazy val Versions = new {
   val grpc = "1.42.1"
   val slf4j = "1.7.30"
   val assertj = "3.12.2"
+  val catsEffect2 = "2.5.3"
   val catsEffect3 = "3.3.5"
 }
 
@@ -59,7 +60,21 @@ lazy val root = (project in file("."))
     publish / skip := true,
     crossScalaVersions := Nil
   )
-  .aggregate(api, scalaApi, scalaCatsEffect3, core, dropwizardCommon, jmx, jmxAvast, graphite, filter, formatting, statsd, grpc)
+  .aggregate(
+    api,
+    scalaApi,
+    scalaCatsEffect2,
+    scalaCatsEffect3,
+    core,
+    dropwizardCommon,
+    jmx,
+    jmxAvast,
+    graphite,
+    filter,
+    formatting,
+    statsd,
+    grpc
+  )
 
 lazy val api = (project in file("api")).settings(
   commonSettings,
@@ -75,7 +90,19 @@ lazy val scalaApi = (project in file("scala-api"))
   )
   .dependsOn(api, jmx % "test")
 
-lazy val scalaCatsEffect3 = (project in file("scala-effect-api"))
+lazy val scalaCatsEffect2 = (project in file("scala-effect-api-cats2"))
+  .settings(
+    commonSettings,
+    scalaSettings,
+    scalacOptions += "-language:higherKinds",
+    name := "metrics-cats-effect-2",
+    libraryDependencies ++= Seq(
+      "org.typelevel" %% "cats-effect" % Versions.catsEffect2
+    )
+  )
+  .dependsOn(scalaApi, jmx % "test")
+
+lazy val scalaCatsEffect3 = (project in file("scala-effect-api-cats3"))
   .settings(
     commonSettings,
     scalaSettings,
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Counter.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Counter.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Counter.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Counter.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Counting.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Counting.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Counting.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Counting.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Gauge.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Gauge.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Gauge.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Gauge.scala
diff --git a/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/GaugeFactory.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/GaugeFactory.scala
new file mode 100644
index 0000000..28beb93
--- /dev/null
+++ b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/GaugeFactory.scala
@@ -0,0 +1,7 @@
+package com.avast.metrics.scalaeffectapi
+
+trait GaugeFactory[F[_]] {
+  def settableLong(name: String, replaceExisting: Boolean = false): SettableGauge[F, Long]
+  def settableDouble(name: String, replaceExisting: Boolean = false): SettableGauge[F, Double]
+  def generic[T](name: String, replaceExisting: Boolean = false)(gauge: () => T): Gauge[F, T]
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Histogram.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Histogram.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Histogram.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Histogram.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Meter.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Meter.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Meter.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Meter.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Monitor.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Monitor.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Monitor.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Monitor.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/SettableGauge.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/SettableGauge.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/SettableGauge.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/SettableGauge.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Timer.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Timer.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/Timer.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/Timer.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/TimerPair.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/TimerPair.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/TimerPair.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/TimerPair.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/CounterImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/CounterImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/CounterImpl.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/CounterImpl.scala
diff --git a/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/GaugeFactoryImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/GaugeFactoryImpl.scala
new file mode 100644
index 0000000..0494d10
--- /dev/null
+++ b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/GaugeFactoryImpl.scala
@@ -0,0 +1,53 @@
+package com.avast.metrics.scalaeffectapi.impl
+
+import cats.effect.Sync
+import com.avast.metrics.scalaapi.{Monitor => SMonitor}
+import com.avast.metrics.scalaeffectapi.{Gauge, GaugeFactory, SettableGauge}
+
+import java.util.concurrent.atomic.{AtomicLong, AtomicReference}
+
+private class GaugeFactoryImpl[F[_]: Sync](monitor: SMonitor) extends GaugeFactory[F] {
+
+  override def settableLong(gaugeName: String, replaceExisting: Boolean = false): SettableGauge[F, Long] = new SettableGauge[F, Long] {
+    private[this] val valueRef = new AtomicLong(0L)
+    private[this] val gauge = monitor.gauge(gaugeName, replaceExisting)(valueRef.get)
+
+    override def set(value: Long): F[Unit] = Sync[F].delay(valueRef.set(value))
+
+    override def name: String = gauge.name
+
+    override def value: F[Long] = Sync[F].delay(gauge.value)
+
+    override def update(f: Long => Long): F[Long] = Sync[F].delay(valueRef.updateAndGet(f(_)))
+
+    override def inc: F[Long] = Sync[F].delay(valueRef.incrementAndGet())
+
+    override def dec: F[Long] = Sync[F].delay(valueRef.decrementAndGet())
+  }
+
+  override def settableDouble(gaugeName: String, replaceExisting: Boolean = false): SettableGauge[F, Double] =
+    new SettableGauge[F, Double] {
+      private[this] val valueRef = new AtomicReference(0.0)
+      private[this] val gauge = monitor.gauge(gaugeName, replaceExisting)(valueRef.get)
+
+      override def set(value: Double): F[Unit] = Sync[F].delay(valueRef.set(value))
+
+      override def name: String = gauge.name
+
+      override def value: F[Double] = Sync[F].delay(gauge.value)
+
+      override def update(f: Double => Double): F[Double] = Sync[F].delay(valueRef.updateAndGet(f(_)))
+
+      override def inc: F[Double] = Sync[F].delay(valueRef.accumulateAndGet(1, (a, b) => a + b))
+
+      override def dec: F[Double] = Sync[F].delay(valueRef.accumulateAndGet(1, (a, b) => a - b))
+    }
+
+  override def generic[T](gaugeName: String, replaceExisting: Boolean = false)(gauge: () => T): Gauge[F, T] = new Gauge[F, T] {
+    private[this] val sGauge = monitor.gauge(gaugeName, replaceExisting)(gauge)
+
+    override def value: F[T] = Sync[F].delay(sGauge.value)
+
+    override def name: String = sGauge.name
+  }
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/HistogramImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/HistogramImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/HistogramImpl.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/HistogramImpl.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MeterImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MeterImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MeterImpl.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MeterImpl.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MonitorImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MonitorImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MonitorImpl.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MonitorImpl.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerImpl.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerImpl.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerPairImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerPairImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerPairImpl.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerPairImpl.scala
diff --git a/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyGaugeFactory.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyGaugeFactory.scala
new file mode 100644
index 0000000..e78d1ed
--- /dev/null
+++ b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyGaugeFactory.scala
@@ -0,0 +1,9 @@
+package com.avast.metrics.scalaeffectapi.perkey
+
+import com.avast.metrics.scalaeffectapi.{Gauge, SettableGauge}
+
+trait PerKeyGaugeFactory[F[_]] {
+  def settableLong(baseName: String, replaceExisting: Boolean = false): PerKeyMetric[SettableGauge[F, Long]]
+  def settableDouble(baseName: String, replaceExisting: Boolean = false): PerKeyMetric[SettableGauge[F, Double]]
+  def generic[T](baseName: String, replaceExisting: Boolean = false)(gauge: () => T): PerKeyMetric[Gauge[F, T]]
+}
diff --git a/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMetric.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMetric.scala
new file mode 100644
index 0000000..43e8185
--- /dev/null
+++ b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMetric.scala
@@ -0,0 +1,5 @@
+package com.avast.metrics.scalaeffectapi.perkey
+
+trait PerKeyMetric[M] {
+  def forKey(str: String): M
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMonitor.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMonitor.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMonitor.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMonitor.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyOps.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyOps.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyOps.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyOps.scala
diff --git a/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyGaugeFactoryImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyGaugeFactoryImpl.scala
new file mode 100644
index 0000000..25aa909
--- /dev/null
+++ b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyGaugeFactoryImpl.scala
@@ -0,0 +1,28 @@
+package com.avast.metrics.scalaeffectapi.perkey.impl
+
+import com.avast.metrics.scalaeffectapi.{Gauge, Monitor, SettableGauge}
+import com.avast.metrics.scalaeffectapi.perkey.{PerKeyGaugeFactory, PerKeyMetric}
+
+import scala.collection.concurrent.TrieMap
+
+class PerKeyGaugeFactoryImpl[F[_]](monitor: Monitor[F]) extends PerKeyGaugeFactory[F] {
+  private def emptyMap[M] = TrieMap.empty[String, M]
+
+  override def settableLong(baseName: String, replaceExisting: Boolean = false): PerKeyMetric[SettableGauge[F, Long]] = {
+    val instanceBuilder = monitor.named(baseName)
+    new PerKeyMetricImpl[SettableGauge[F, Long]](emptyMap[SettableGauge[F, Long]], instanceBuilder.gauge.settableLong(_, replaceExisting))
+  }
+
+  override def settableDouble(baseName: String, replaceExisting: Boolean = false): PerKeyMetric[SettableGauge[F, Double]] = {
+    val instanceBuilder = monitor.named(baseName)
+    new PerKeyMetricImpl[SettableGauge[F, Double]](
+      emptyMap[SettableGauge[F, Double]],
+      instanceBuilder.gauge.settableDouble(_, replaceExisting)
+    )
+  }
+
+  override def generic[T](baseName: String, replaceExisting: Boolean = false)(gauge: () => T): PerKeyMetric[Gauge[F, T]] = {
+    val instanceBuilder = monitor.named(baseName)
+    new PerKeyMetricImpl[Gauge[F, T]](emptyMap[Gauge[F, T]], instanceBuilder.gauge.generic(_, replaceExisting)(gauge))
+  }
+}
diff --git a/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMetricImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMetricImpl.scala
new file mode 100644
index 0000000..0e48b04
--- /dev/null
+++ b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMetricImpl.scala
@@ -0,0 +1,11 @@
+package com.avast.metrics.scalaeffectapi.perkey.impl
+
+import com.avast.metrics.scalaeffectapi.perkey.PerKeyMetric
+
+import scala.collection.concurrent.{Map => CMap}
+
+private[perkey] class PerKeyMetricImpl[A](map: CMap[String, A], metricBuilder: String => A) extends PerKeyMetric[A] {
+  override def forKey(str: String): A = {
+    map.getOrElseUpdate(str, metricBuilder(str))
+  }
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMonitorImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMonitorImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMonitorImpl.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMonitorImpl.scala
diff --git a/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyOpsImpl.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyOpsImpl.scala
new file mode 100644
index 0000000..b6abc09
--- /dev/null
+++ b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyOpsImpl.scala
@@ -0,0 +1,40 @@
+package com.avast.metrics.scalaeffectapi.perkey.impl
+
+import com.avast.metrics.scalaeffectapi._
+import com.avast.metrics.scalaeffectapi.perkey.{PerKeyGaugeFactory, PerKeyMetric, PerKeyOps}
+
+import scala.collection.concurrent.TrieMap
+
+private[perkey] class PerKeyOpsImpl[F[_]](monitor: Monitor[F]) extends PerKeyOps[F] {
+  private def emptyMap[M] = TrieMap.empty[String, M]
+
+  override def meter(baseName: String): PerKeyMetric[Meter[F]] = {
+    val instanceBuilder = monitor.named(baseName)
+    new PerKeyMetricImpl[Meter[F]](emptyMap[Meter[F]], instanceBuilder.meter)
+  }
+
+  override def counter(baseName: String): PerKeyMetric[Counter[F]] = {
+    val instanceBuilder = monitor.named(baseName)
+    new PerKeyMetricImpl[Counter[F]](emptyMap, instanceBuilder.counter)
+  }
+
+  override def timer(baseName: String): PerKeyMetric[Timer[F]] = {
+    val instanceBuilder = monitor.named(baseName)
+    new PerKeyMetricImpl[Timer[F]](emptyMap, instanceBuilder.timer)
+  }
+
+  override def timerPair(baseName: String): PerKeyMetric[TimerPair[F]] = {
+    val instanceBuilder = monitor.named(baseName)
+    new PerKeyMetricImpl[TimerPair[F]](emptyMap, instanceBuilder.timerPair)
+  }
+
+  override def histogram(baseName: String): PerKeyMetric[Histogram[F]] = {
+    val instanceBuilder = monitor.named(baseName)
+    new PerKeyMetricImpl[Histogram[F]](emptyMap, instanceBuilder.histogram)
+  }
+
+  override def gauge: PerKeyGaugeFactory[F] = {
+    new PerKeyGaugeFactoryImpl[F](monitor)
+  }
+
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/package.scala b/scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/package.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/package.scala
rename to scala-effect-api-cats2/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/package.scala
diff --git a/scala-effect-api-cats2/src/test/scala/com/avast/metrics/examples/EffectMonitor.scala b/scala-effect-api-cats2/src/test/scala/com/avast/metrics/examples/EffectMonitor.scala
new file mode 100644
index 0000000..2f48d94
--- /dev/null
+++ b/scala-effect-api-cats2/src/test/scala/com/avast/metrics/examples/EffectMonitor.scala
@@ -0,0 +1,26 @@
+package com.avast.metrics.examples
+
+import cats.effect.{ExitCode, IO, IOApp, Timer}
+import com.avast.metrics.dropwizard.JmxMetricsMonitor
+import com.avast.metrics.scalaeffectapi.Monitor
+
+import java.util.concurrent.TimeUnit
+import scala.concurrent.duration.FiniteDuration
+
+object EffectMonitor extends IOApp {
+
+  val jmxMetricsMonitor = new JmxMetricsMonitor("com.avast.some.app")
+
+  override def run(args: List[String]): IO[ExitCode] = {
+    val monitor = Monitor.wrapJava[IO](jmxMetricsMonitor)
+    val counter = monitor.counter("counter")
+    val timer = monitor.timer("timer")
+
+    for {
+      _ <- counter.inc
+      _ <- timer.time {
+        Timer[IO](IO.timer(executionContext)).sleep(FiniteDuration(500, TimeUnit.MILLISECONDS))
+      }
+    } yield ExitCode.Success
+  }
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Counter.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Counter.scala
new file mode 100644
index 0000000..62a6cc0
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Counter.scala
@@ -0,0 +1,10 @@
+package com.avast.metrics.scalaeffectapi
+
+import com.avast.metrics.scalaapi.Metric
+
+trait Counter[F[_]] extends Counting[F] with Metric {
+  def inc: F[Unit]
+  def inc(n: Long): F[Unit]
+  def dec: F[Unit]
+  def dec(n: Int): F[Unit]
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Counting.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Counting.scala
new file mode 100644
index 0000000..4ee93c8
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Counting.scala
@@ -0,0 +1,5 @@
+package com.avast.metrics.scalaeffectapi
+
+trait Counting[F[_]] {
+  def count: F[Long]
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Gauge.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Gauge.scala
new file mode 100644
index 0000000..65fbbd3
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Gauge.scala
@@ -0,0 +1,7 @@
+package com.avast.metrics.scalaeffectapi
+
+import com.avast.metrics.scalaapi.Metric
+
+trait Gauge[F[_], T] extends Metric {
+  def value: F[T]
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/GaugeFactory.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/GaugeFactory.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/GaugeFactory.scala
rename to scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/GaugeFactory.scala
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Histogram.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Histogram.scala
new file mode 100644
index 0000000..1b92e9d
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Histogram.scala
@@ -0,0 +1,7 @@
+package com.avast.metrics.scalaeffectapi
+
+import com.avast.metrics.scalaapi.Metric
+
+trait Histogram[F[_]] extends Metric {
+  def update(value: Long): F[Unit]
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Meter.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Meter.scala
new file mode 100644
index 0000000..8bfa51b
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Meter.scala
@@ -0,0 +1,8 @@
+package com.avast.metrics.scalaeffectapi
+
+import com.avast.metrics.scalaapi.Metric
+
+trait Meter[F[_]] extends Counting[F] with Metric {
+  def mark: F[Unit]
+  def mark(n: Long): F[Unit]
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Monitor.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Monitor.scala
new file mode 100644
index 0000000..9308f05
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Monitor.scala
@@ -0,0 +1,36 @@
+package com.avast.metrics.scalaeffectapi
+
+import cats.effect.Sync
+import com.avast.metrics.api.{Monitor => JMonitor, Naming}
+import com.avast.metrics.scalaapi.{Monitor => SMonitor}
+import com.avast.metrics.test.NoOpMonitor
+
+trait Monitor[F[_]] extends AutoCloseable {
+  def named(name: String): Monitor[F]
+  def named(name1: String, name2: String, restOfNames: String*): Monitor[F]
+  def getName: String
+  def meter(name: String): Meter[F]
+  def counter(name: String): Counter[F]
+  def timer(name: String): Timer[F]
+  def timerPair(name: String): TimerPair[F]
+  def histogram(name: String): Histogram[F]
+
+  def gauge: GaugeFactory[F]
+
+  def asJava: JMonitor
+  def asPlainScala: SMonitor
+}
+
+object Monitor {
+
+  def wrapJava[F[_]: Sync](monitor: JMonitor): Monitor[F] = wrapJava(monitor, Naming.defaultNaming())
+  def wrapJava[F[_]: Sync](monitor: JMonitor, naming: Naming): Monitor[F] = wrap(SMonitor(monitor), naming)
+
+  def wrap[F[_]: Sync](monitor: SMonitor): Monitor[F] = wrap(monitor, Naming.defaultNaming())
+  def wrap[F[_]: Sync](monitor: SMonitor, naming: Naming): Monitor[F] = new impl.MonitorImpl(monitor, naming)
+
+  def noOp[F[_]: Sync](): Monitor[F] = {
+    wrapJava(NoOpMonitor.INSTANCE)
+  }
+
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/SettableGauge.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/SettableGauge.scala
new file mode 100644
index 0000000..a7e1d6d
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/SettableGauge.scala
@@ -0,0 +1,8 @@
+package com.avast.metrics.scalaeffectapi
+
+trait SettableGauge[F[_], T] extends Gauge[F, T] {
+  def set(value: T): F[Unit]
+  def update(f: T => T): F[T]
+  def inc: F[T]
+  def dec: F[T]
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Timer.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Timer.scala
new file mode 100644
index 0000000..f905299
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/Timer.scala
@@ -0,0 +1,15 @@
+package com.avast.metrics.scalaeffectapi
+
+import java.time.{Duration => JDuration}
+import scala.concurrent.duration.Duration
+
+trait Timer[F[_]] {
+  trait TimeContext extends AutoCloseable {
+    def stop: F[Duration]
+  }
+
+  def start: F[TimeContext]
+  def update(duration: JDuration): F[Unit]
+  def update(duration: Duration): F[Unit]
+  def time[A](block: F[A]): F[A]
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/TimerPair.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/TimerPair.scala
new file mode 100644
index 0000000..5130fa8
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/TimerPair.scala
@@ -0,0 +1,19 @@
+package com.avast.metrics.scalaeffectapi
+
+import java.time.{Duration => JDuration}
+import scala.concurrent.duration.Duration
+
+trait TimerPair[F[_]] {
+  trait TimerPairContext extends AutoCloseable {
+    def stop: F[Duration]
+    def stopFailure: F[Duration]
+  }
+
+  def start: F[TimerPairContext]
+  def update(duration: JDuration): F[Unit]
+  def updateFailure(duration: JDuration): F[Unit]
+  def update(duration: Duration): F[Unit]
+  def updateFailure(duration: Duration): F[Unit]
+  def time[T](action: F[T]): F[T]
+  def time[T](action: F[T])(successCheck: T => Boolean): F[T]
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/CounterImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/CounterImpl.scala
new file mode 100644
index 0000000..fedc7be
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/CounterImpl.scala
@@ -0,0 +1,19 @@
+package com.avast.metrics.scalaeffectapi.impl
+
+import cats.effect.Sync
+import com.avast.metrics.scalaapi.{Counter => SCounter}
+import com.avast.metrics.scalaeffectapi.Counter
+
+private class CounterImpl[F[_]: Sync](inner: SCounter) extends Counter[F] {
+  override def inc: F[Unit] = Sync[F].delay(inner.inc())
+
+  override def inc(n: Long): F[Unit] = Sync[F].delay(inner.inc(n))
+
+  override def dec: F[Unit] = Sync[F].delay(inner.dec())
+
+  override def dec(n: Int): F[Unit] = Sync[F].delay(inner.dec(n))
+
+  override def count: F[Long] = Sync[F].delay(inner.count)
+
+  override def name: String = inner.name
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/GaugeFactoryImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/GaugeFactoryImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/impl/GaugeFactoryImpl.scala
rename to scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/GaugeFactoryImpl.scala
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/HistogramImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/HistogramImpl.scala
new file mode 100644
index 0000000..d481436
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/HistogramImpl.scala
@@ -0,0 +1,11 @@
+package com.avast.metrics.scalaeffectapi.impl
+
+import cats.effect.Sync
+import com.avast.metrics.scalaapi.{Histogram => SHistogram}
+import com.avast.metrics.scalaeffectapi.Histogram
+
+private class HistogramImpl[F[_]: Sync](histogram: SHistogram) extends Histogram[F] {
+  override def update(value: Long): F[Unit] = Sync[F].delay(histogram.update(value))
+
+  override def name: String = histogram.name
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MeterImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MeterImpl.scala
new file mode 100644
index 0000000..121c797
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MeterImpl.scala
@@ -0,0 +1,15 @@
+package com.avast.metrics.scalaeffectapi.impl
+
+import cats.effect.Sync
+import com.avast.metrics.scalaapi.{Meter => SMeter}
+import com.avast.metrics.scalaeffectapi.Meter
+
+private class MeterImpl[F[_]: Sync](meter: SMeter) extends Meter[F] {
+  override def mark: F[Unit] = Sync[F].delay(meter.mark())
+
+  override def mark(n: Long): F[Unit] = Sync[F].delay(meter.mark(n))
+
+  override def count: F[Long] = Sync[F].delay(meter.count)
+
+  override def name: String = meter.name
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MonitorImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MonitorImpl.scala
new file mode 100644
index 0000000..780af02
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/MonitorImpl.scala
@@ -0,0 +1,37 @@
+package com.avast.metrics.scalaeffectapi.impl
+
+import cats.effect.Sync
+import com.avast.metrics.api.{Monitor => JMonitor, Naming}
+
+import com.avast.metrics.scalaapi.{Monitor => SMonitor}
+import com.avast.metrics.scalaeffectapi._
+
+private[scalaeffectapi] class MonitorImpl[F[_]: Sync](monitor: SMonitor, naming: Naming) extends Monitor[F] {
+
+  override def named(name: String): Monitor[F] = new MonitorImpl(monitor.named(name), naming)
+
+  override def named(name: String, name2: String, names: String*): Monitor[F] =
+    new MonitorImpl(monitor.named(name, name2, names: _*), naming)
+
+  override def getName: String = monitor.getName
+
+  override def meter(name: String): Meter[F] = new MeterImpl[F](monitor.meter(name))
+
+  override def counter(name: String): Counter[F] = new CounterImpl(monitor.counter(name))
+
+  override def timer(name: String): Timer[F] = new TimerImpl(monitor.timer(name))
+
+  override def timerPair(name: String): TimerPair[F] =
+    new TimerPairImpl(timer(naming.successTimerName(name)), timer(naming.failureTimerName(name)))
+
+  override def histogram(name: String): Histogram[F] = new HistogramImpl(monitor.histogram(name))
+
+  override def gauge: GaugeFactory[F] = new GaugeFactoryImpl(monitor)
+
+  override def close(): Unit = monitor.close()
+
+  override def asJava: JMonitor = monitor.asJava
+
+  override def asPlainScala: SMonitor = monitor
+
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerImpl.scala
new file mode 100644
index 0000000..e3afd4e
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerImpl.scala
@@ -0,0 +1,34 @@
+package com.avast.metrics.scalaeffectapi.impl
+
+import cats.effect.Sync
+import cats.syntax.flatMap._
+import cats.syntax.functor._
+
+import java.time.{Duration => JDuration}
+import com.avast.metrics.scalaapi.{Timer => STimer}
+import com.avast.metrics.scalaeffectapi.Timer
+
+import scala.concurrent.duration.Duration
+
+private class TimerImpl[F[_]: Sync](inner: STimer) extends Timer[F] {
+  override def start: F[TimeContext] = Sync[F].delay {
+    val context = inner.start()
+    new TimeContext {
+      override def stop: F[Duration] = Sync[F].delay(Duration.fromNanos(context.stopAndGetTime()))
+
+      override def close(): Unit = context.close()
+    }
+  }
+
+  override def update(duration: JDuration): F[Unit] = Sync[F].delay(inner.update(duration))
+
+  override def update(duration: Duration): F[Unit] = update(JDuration.ofNanos(duration.toNanos))
+
+  override def time[A](block: F[A]): F[A] = {
+    for {
+      context <- start
+      result <- block
+      _ <- context.stop
+    } yield result
+  }
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerPairImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerPairImpl.scala
new file mode 100644
index 0000000..bf56e7a
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/impl/TimerPairImpl.scala
@@ -0,0 +1,52 @@
+package com.avast.metrics.scalaeffectapi.impl
+
+import cats.effect.Sync
+import cats.syntax.applicativeError._
+import cats.syntax.flatMap._
+import cats.syntax.functor._
+import com.avast.metrics.scalaeffectapi.{Timer, TimerPair}
+
+import java.time.{Duration => JDuration}
+import scala.concurrent.duration.Duration
+
+private class TimerPairImpl[F[_]: Sync](success: Timer[F], failure: Timer[F]) extends TimerPair[F] {
+  override def start: F[TimerPairContext] = {
+    for {
+      succCtx <- success.start
+      failCtx <- failure.start
+    } yield new TimerPairContext {
+      override def stop: F[Duration] = succCtx.stop
+
+      override def stopFailure: F[Duration] = failCtx.stop
+
+      override def close(): Unit = {
+        succCtx.close()
+        failCtx.close()
+      }
+    }
+  }
+
+  override def update(duration: JDuration): F[Unit] = success.update(duration)
+
+  override def updateFailure(duration: JDuration): F[Unit] = failure.update(duration)
+
+  override def update(duration: Duration): F[Unit] = success.update(duration)
+
+  override def updateFailure(duration: Duration): F[Unit] = failure.update(duration)
+
+  override def time[T](action: F[T]): F[T] = {
+    for {
+      ctx <- start
+      result <- action.onError { case _ => ctx.stopFailure.void }
+      _ <- ctx.stop
+    } yield result
+  }
+
+  override def time[T](action: F[T])(successCheck: T => Boolean): F[T] = {
+    for {
+      ctx <- start
+      result <- action.onError { case _ => ctx.stopFailure.void }
+      _ <- if (successCheck(result)) ctx.stop else ctx.stopFailure
+    } yield result
+  }
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyGaugeFactory.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyGaugeFactory.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyGaugeFactory.scala
rename to scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyGaugeFactory.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyHelper.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyHelper.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyHelper.scala
rename to scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyHelper.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMetric.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMetric.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMetric.scala
rename to scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMetric.scala
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMonitor.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMonitor.scala
new file mode 100644
index 0000000..8cace67
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyMonitor.scala
@@ -0,0 +1,13 @@
+package com.avast.metrics.scalaeffectapi.perkey
+
+import com.avast.metrics.scalaeffectapi.Monitor
+import com.avast.metrics.scalaeffectapi.perkey.impl.{PerKeyMonitorImpl, PerKeyOpsImpl}
+
+trait PerKeyMonitor[F[_]] extends Monitor[F] {
+  def perKey: PerKeyOps[F]
+}
+
+object PerKeyMonitor {
+  def apply[F[_]](monitor: Monitor[F]): PerKeyMonitor[F] =
+    new PerKeyMonitorImpl(monitor, new PerKeyOpsImpl(monitor))
+}
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyOps.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyOps.scala
new file mode 100644
index 0000000..7bd4db2
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/PerKeyOps.scala
@@ -0,0 +1,12 @@
+package com.avast.metrics.scalaeffectapi.perkey
+
+import com.avast.metrics.scalaeffectapi._
+
+trait PerKeyOps[F[_]] {
+  def meter(name: String): PerKeyMetric[Meter[F]]
+  def counter(name: String): PerKeyMetric[Counter[F]]
+  def timer(name: String): PerKeyMetric[Timer[F]]
+  def timerPair(name: String): PerKeyMetric[TimerPair[F]]
+  def histogram(name: String): PerKeyMetric[Histogram[F]]
+  def gauge: PerKeyGaugeFactory[F]
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyGaugeFactoryImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyGaugeFactoryImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyGaugeFactoryImpl.scala
rename to scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyGaugeFactoryImpl.scala
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMetricImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMetricImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMetricImpl.scala
rename to scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMetricImpl.scala
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMonitorImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMonitorImpl.scala
new file mode 100644
index 0000000..c2fe724
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyMonitorImpl.scala
@@ -0,0 +1,36 @@
+package com.avast.metrics.scalaeffectapi.perkey.impl
+
+import com.avast.metrics.{api, scalaapi}
+import com.avast.metrics.scalaeffectapi._
+import com.avast.metrics.scalaeffectapi.perkey.{PerKeyMonitor, PerKeyOps}
+
+/** Adds `perKey` method, otherwise just forward method calls to [[com.avast.metrics.scalaeffectapi.Monitor]]
+  */
+private[perkey] class PerKeyMonitorImpl[F[_]](monitor: Monitor[F], perKeyOps: PerKeyOps[F]) extends PerKeyMonitor[F] {
+  override def perKey: PerKeyOps[F] = perKeyOps
+
+  override def named(name: String): Monitor[F] = monitor.named(name)
+
+  override def named(name: String, name2: String, names: String*): Monitor[F] = monitor.named(name, name2, names: _*)
+
+  override def getName: String = monitor.getName
+
+  override def meter(name: String): Meter[F] = monitor.meter(name)
+
+  override def counter(name: String): Counter[F] = monitor.counter(name)
+
+  override def timer(name: String): Timer[F] = monitor.timer(name)
+
+  override def timerPair(name: String): TimerPair[F] = monitor.timerPair(name)
+
+  override def histogram(name: String): Histogram[F] = monitor.histogram(name)
+
+  override def gauge: GaugeFactory[F] = monitor.gauge
+
+  override def close(): Unit = monitor.close()
+
+  override def asJava: api.Monitor = monitor.asJava
+
+  override def asPlainScala: scalaapi.Monitor = monitor.asPlainScala
+
+}
diff --git a/scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyOpsImpl.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyOpsImpl.scala
similarity index 100%
rename from scala-effect-api/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyOpsImpl.scala
rename to scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/impl/PerKeyOpsImpl.scala
diff --git a/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/package.scala b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/package.scala
new file mode 100644
index 0000000..6037e83
--- /dev/null
+++ b/scala-effect-api-cats3/src/main/scala/com/avast/metrics/scalaeffectapi/perkey/package.scala
@@ -0,0 +1,7 @@
+package com.avast.metrics.scalaeffectapi
+
+package object perkey {
+  implicit class MonitorToPerKeyOps[F[_]](monitor: Monitor[F]) {
+    def perKey: PerKeyOps[F] = PerKeyMonitor(monitor).perKey
+  }
+}
diff --git a/scala-effect-api/src/test/scala/com/avast/metrics/examples/EffectMonitor.scala b/scala-effect-api-cats3/src/test/scala/com/avast/metrics/examples/EffectMonitor.scala
similarity index 100%
rename from scala-effect-api/src/test/scala/com/avast/metrics/examples/EffectMonitor.scala
rename to scala-effect-api-cats3/src/test/scala/com/avast/metrics/examples/EffectMonitor.scala