diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 26c41fe0..2f33708d 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -36,9 +36,11 @@ Ognjen Jevremović <ognjenjevremovic@users.noreply.github.com>
 Philipp Burckhardt <pburckhardt@outlook.com>
 Prajwal Kulkarni <prajwalkulkarni76@gmail.com>
 Pranav Goswami <goswami.4@iitj.ac.in>
+Pratik <97464067+Pratik772846@users.noreply.github.com>
 Ricky Reusser <rsreusser@gmail.com>
 Robert Gislason <gztown2216@yahoo.com>
 Roman Stetsyk <25715951+romanstetsyk@users.noreply.github.com>
+Rutam <138517416+performant23@users.noreply.github.com>
 Ryan Seal <splrk@users.noreply.github.com>
 Seyyed Parsa Neshaei <spneshaei@users.noreply.github.com>
 Shraddheya Shendre <shendreshraddheya@gmail.com>
diff --git a/is-nonpositive-finite/README.md b/is-nonpositive-finite/README.md
new file mode 100644
index 00000000..6859079b
--- /dev/null
+++ b/is-nonpositive-finite/README.md
@@ -0,0 +1,166 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# isNonPositiveFinite
+
+> Test if a value is a number having a nonpositive finite value.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var isNonPositiveFinite = require( '@stdlib/assert/is-nonpositive-finite' );
+```
+
+#### isNonPositiveFinite( value )
+
+Tests if a `value` is a `number` having a nonpositive finite value.
+
+<!-- eslint-disable no-new-wrappers -->
+
+```javascript
+var Number = require( '@stdlib/number/ctor' );
+var NINF = require('@stdlib/constants/float64/ninf');
+
+var bool = isNonPositiveFinite( -5.0 );
+// returns true
+
+bool = isNonPositiveFinite( NINF );
+// returns false
+
+bool = isNonPositiveFinite( new Number( -5.0 ) );
+// returns true
+
+bool = isNonPositiveFinite( -3.14 );
+// returns true
+
+bool = isNonPositiveFinite( 5.0 );
+// returns false
+
+bool = isNonPositiveFinite( null );
+// returns false
+```
+
+#### isNonPositiveFinite.isPrimitive( value )
+
+Tests if a `value` is a primitive `number` having a nonpositive finite value.
+
+<!-- eslint-disable no-new-wrappers -->
+
+```javascript
+var Number = require( '@stdlib/number/ctor' );
+
+var bool = isNonPositiveFinite.isPrimitive( -3.0 );
+// returns true
+
+bool = isNonPositiveFinite.isPrimitive( new Number( -3.0 ) );
+// returns false
+```
+
+#### isNonPositiveFinite.isObject( value )
+
+Tests if a `value` is a `Number` object having a nonpositive finite value.
+
+<!-- eslint-disable no-new-wrappers -->
+
+```javascript
+var Number = require( '@stdlib/number/ctor' );
+
+var bool = isNonPositiveFinite.isObject( -3.0 );
+// returns false
+
+bool = isNonPositiveFinite.isObject( new Number( -3.0 ) );
+// returns true
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint-disable no-new-wrappers -->
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var Number = require( '@stdlib/number/ctor' );
+var isNonPositiveFinite = require( '@stdlib/assert/is-nonpositive-finite' );
+var NINF = require('@stdlib/constants/float64/ninf');
+
+var bool = isNonPositiveFinite( -5.0 );
+// returns true
+
+bool = isNonPositiveFinite( NINF );
+// returns false
+
+bool = isNonPositiveFinite( new Number( -5.0 ) );
+// returns true
+
+bool = isNonPositiveFinite( 0.0 );
+// returns true
+
+bool = isNonPositiveFinite( -3.14 );
+// returns true
+
+bool = isNonPositiveFinite( 5.0 );
+// returns false
+
+bool = isNonPositiveFinite( '-5' );
+// returns false
+
+bool = isNonPositiveFinite( null );
+// returns false
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+* * *
+
+## See Also
+
+-   <span class="package-name">[`@stdlib/assert/is-number`][@stdlib/assert/is-number]</span><span class="delimiter">: </span><span class="description">test if a value is a number.</span>
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+<!-- <related-links> -->
+
+[@stdlib/assert/is-number]: https://github.com/stdlib-js/assert/tree/main/is-number
+
+<!-- </related-links> -->
+
+</section>
+
+<!-- /.links -->
diff --git a/is-nonpositive-finite/benchmark/benchmark.js b/is-nonpositive-finite/benchmark/benchmark.js
new file mode 100644
index 00000000..b23071fd
--- /dev/null
+++ b/is-nonpositive-finite/benchmark/benchmark.js
@@ -0,0 +1,220 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/* eslint-disable no-undefined, no-empty-function */
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var Number = require( '@stdlib/number/ctor' );
+var isBoolean = require( './../../is-boolean' ).isPrimitive;
+var pkg = require( './../package.json' ).name;
+var isNonPositiveFinite = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg+'::primitives', function benchmark( b ) {
+	var values;
+	var bool;
+	var i;
+
+	values = [
+		'5',
+		5.0,
+		4.0,
+		3.14,
+		-5.0,
+		-4.0,
+		NaN,
+		true,
+		false,
+		null
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		bool = isNonPositiveFinite( values[ i % values.length ] );
+		if ( typeof bool !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( !isBoolean( bool ) ) {
+		b.fail( 'should return a boolean' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( pkg+'::objects', function benchmark( b ) {
+	var values;
+	var bool;
+	var i;
+
+	values = [
+		[],
+		{},
+		function noop() {},
+		new Number( 2.0 ),
+		new Number( -3.0 ),
+		new Number( 3.14 )
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		bool = isNonPositiveFinite( values[ i % values.length ] );
+		if ( typeof bool !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( !isBoolean( bool ) ) {
+		b.fail( 'should return a boolean' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( pkg+'::primitives:isPrimitive', function benchmark( b ) {
+	var values;
+	var bool;
+	var i;
+
+	values = [
+		'5',
+		5.0,
+		4.0,
+		3.14,
+		-5.0,
+		-4.0,
+		NaN,
+		true,
+		false,
+		null,
+		undefined
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		bool = isNonPositiveFinite.isPrimitive( values[ i % values.length ] );
+		if ( typeof bool !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( !isBoolean( bool ) ) {
+		b.fail( 'should return a boolean' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( pkg+'::objects:isPrimitive', function benchmark( b ) {
+	var values;
+	var bool;
+	var i;
+
+	values = [
+		[],
+		{},
+		function noop() {},
+		new Number( 2.0 ),
+		new Number( -3.0 ),
+		new Number( 3.14 )
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		bool = isNonPositiveFinite.isPrimitive( values[ i % values.length ] );
+		if ( typeof bool !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( !isBoolean( bool ) ) {
+		b.fail( 'should return a boolean' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( pkg+'::primitives:isObject', function benchmark( b ) {
+	var values;
+	var bool;
+	var i;
+
+	values = [
+		'5',
+		5.0,
+		4.0,
+		3.14,
+		-5.0,
+		-4.0,
+		NaN,
+		true,
+		false,
+		null,
+		undefined
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		bool = isNonPositiveFinite.isObject( values[ i % values.length ] );
+		if ( typeof bool !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( !isBoolean( bool ) ) {
+		b.fail( 'should return a boolean' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
+
+bench( pkg+'::objects:isObject', function benchmark( b ) {
+	var values;
+	var bool;
+	var i;
+
+	values = [
+		[],
+		{},
+		function noop() {},
+		new Number( 2.0 ),
+		new Number( -3.0 ),
+		new Number( 3.14 )
+	];
+
+	b.tic();
+	for ( i = 0; i < b.iterations; i++ ) {
+		bool = isNonPositiveFinite.isObject( values[ i % values.length ] );
+		if ( typeof bool !== 'boolean' ) {
+			b.fail( 'should return a boolean' );
+		}
+	}
+	b.toc();
+	if ( !isBoolean( bool ) ) {
+		b.fail( 'should return a boolean' );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});
diff --git a/is-nonpositive-finite/docs/repl.txt b/is-nonpositive-finite/docs/repl.txt
new file mode 100644
index 00000000..86baa02f
--- /dev/null
+++ b/is-nonpositive-finite/docs/repl.txt
@@ -0,0 +1,75 @@
+
+{{alias}}( value )
+    Tests if a value is a nonpositive finite number.
+
+    Parameters
+    ----------
+    value: any
+        Value to test.
+
+    Returns
+    -------
+    bool: boolean
+        Boolean indicating whether value is a nonpositive finite number.
+
+    Examples
+    --------
+    > var bool = {{alias}}( -5.0 )
+    true
+    > bool = {{alias}}( new Number( -5.0 ) )
+    true
+    > bool = {{alias}}( -3.14 )
+    true
+    > bool = {{alias}}( 5.0 )
+    false
+    > bool = {{alias}}( null )
+    false
+
+
+{{alias}}.isPrimitive( value )
+    Tests if a value is a number primitive having a nonpositive finite value.
+
+    Parameters
+    ----------
+    value: any
+        Value to test.
+
+    Returns
+    -------
+    bool: boolean
+        Boolean indicating whether value is a number primitive having a
+        nonpositive finite value.
+
+    Examples
+    --------
+    > var bool = {{alias}}.isPrimitive( -3.0 )
+    true
+    > bool = {{alias}}.isPrimitive( new Number( -3.0 ) )
+    false
+
+
+{{alias}}.isObject( value )
+    Tests if a value is a number object having a nonpositive finite value.
+
+    Parameters
+    ----------
+    value: any
+        Value to test.
+
+    Returns
+    -------
+    bool: boolean
+        Boolean indicating whether value is a number object having a nonpositive
+        finite value.
+
+    Examples
+    --------
+    > var bool = {{alias}}.isObject( -3.0 )
+    false
+    > bool = {{alias}}.isObject( new Number( -3.0 ) )
+    true
+
+
+    See Also
+    --------
+
diff --git a/is-nonpositive-finite/docs/types/index.d.ts b/is-nonpositive-finite/docs/types/index.d.ts
new file mode 100644
index 00000000..61c2aa00
--- /dev/null
+++ b/is-nonpositive-finite/docs/types/index.d.ts
@@ -0,0 +1,125 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+/**
+* Interface defining `isNonPositiveFinite` with methods for testing for primitives and objects, respectively.
+*/
+interface IsNonPositiveFinite {
+	/**
+	* Tests if a value is a nonpositive finite number.
+	*
+	* @param value - value to test
+	* @returns boolean indicating whether value is a nonpositive finite number
+	*
+	* @example
+	* var bool = isNonPositiveFinite( -5.0 );
+	* // returns true
+	*
+	* @example
+	* var bool = isNonPositiveFinite( new Number( -5.0 ) );
+	* // returns true
+	*
+	* @example
+	* var bool = isNonPositiveFinite( -3.14 );
+	* // returns true
+	*
+	* @example
+	* var bool = isNonPositiveFinite( 5.0 );
+	* // returns false
+	*
+	* @example
+	* var bool = isNonPositiveFinite( null );
+	* // returns false
+	*/
+	( value: any ): value is number | Number;
+
+	/**
+	* Tests if a value is a number primitive having a nonpositive finite value.
+	*
+	* @param value - value to test
+	* @returns boolean indicating if a value is a number primitive having a nonpositive finite number value
+	*
+	* @example
+	* var bool = isNonPositiveFinite.isPrimitive( -3.0 );
+	* // returns true
+	*
+	* @example
+	* var bool = isNonPositiveFinite.isPrimitive( new Number( -3.0 ) );
+	* // returns false
+	*/
+	isPrimitive( value: any ): value is number;
+
+	/**
+	* Tests if a value is a number object having a nonpositive finite value.
+	*
+	* @param value - value to test
+	* @returns boolean indicating if a value is a number object having a nonpositive number value
+	*
+	* @example
+	* var bool = isNonPositiveFinite.isObject( -3.0 );
+	* // returns false
+	*
+	* @example
+	* var bool = isNonPositiveFinite.isObject( new Number( -3.0 ) );
+	* // returns true
+	*/
+	isObject( value: any ): value is Number;
+}
+
+/**
+* Tests if a value is a nonpositive finite number.
+*
+* @param value - value to test
+* @returns boolean indicating whether value is a nonpositive finite number
+*
+* @example
+* var bool = isNonPositiveFinite( -5.0 );
+* // returns true
+*
+* @example
+* var bool = isNonPositiveFinite( new Number( -5.0 ) );
+* // returns true
+*
+* @example
+* var bool = isNonPositiveFinite( -3.14 );
+* // returns true
+*
+* @example
+* var bool = isNonPositiveFinite( 5.0 );
+* // returns false
+*
+* @example
+* var bool = isNonPositiveFinite( null );
+* // returns false
+*
+* @example
+* var bool = isNonPositiveFinite.isPrimitive( -3.0 );
+* // returns true
+*
+* @example
+* var bool = isNonPositiveFinite.isObject( new Number( -3.0 ) );
+* // returns true
+*/
+declare var isNonPositiveFinite: IsNonPositiveFinite;
+
+
+// EXPORTS //
+
+export = isNonPositiveFinite;
diff --git a/is-nonpositive-finite/docs/types/test.ts b/is-nonpositive-finite/docs/types/test.ts
new file mode 100644
index 00000000..f2b8a35a
--- /dev/null
+++ b/is-nonpositive-finite/docs/types/test.ts
@@ -0,0 +1,60 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import isNonPositiveFinite = require( './index' );
+
+
+// TESTS //
+
+// The function returns a boolean...
+{
+	isNonPositiveFinite( 1.2 ); // $ExpectType boolean
+	isNonPositiveFinite( -3 ); // $ExpectType boolean
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+	isNonPositiveFinite(); // $ExpectError
+	isNonPositiveFinite( -2, 123 ); // $ExpectError
+}
+
+// Attached to main export is an isPrimitive method which returns a boolean...
+{
+	// eslint-disable-next-line no-new-wrappers
+	isNonPositiveFinite.isPrimitive( new Number( -2 ) ); // $ExpectType boolean
+	isNonPositiveFinite.isPrimitive( -2 ); // $ExpectType boolean
+}
+
+// The compiler throws an error if the isPrimitive method is provided an unsupported number of arguments...
+{
+	isNonPositiveFinite.isPrimitive(); // $ExpectError
+	isNonPositiveFinite.isPrimitive( -2, 123 ); // $ExpectError
+}
+
+// Attached to main export is an isObject method which returns a boolean...
+{
+	// eslint-disable-next-line no-new-wrappers
+	isNonPositiveFinite.isObject( new Number( -2 ) ); // $ExpectType boolean
+	isNonPositiveFinite.isObject( -2 ); // $ExpectType boolean
+}
+
+// The compiler throws an error if the isObject method is provided an unsupported number of arguments...
+{
+	isNonPositiveFinite.isObject(); // $ExpectError
+	isNonPositiveFinite.isObject( -2, 123 ); // $ExpectError
+}
diff --git a/is-nonpositive-finite/examples/index.js b/is-nonpositive-finite/examples/index.js
new file mode 100644
index 00000000..bdf0c8ce
--- /dev/null
+++ b/is-nonpositive-finite/examples/index.js
@@ -0,0 +1,51 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/* eslint-disable no-empty-function, no-restricted-syntax */
+
+'use strict';
+
+var NINF = require('@stdlib/constants/float64/ninf');
+var isNonPositiveFinite = require( './../lib' );
+
+console.log( isNonPositiveFinite( -2 ));
+// => true
+
+console.log( isNonPositiveFinite( -2.99 ));
+// => true
+
+console.log( isNonPositiveFinite( NINF ) );
+// => false
+
+console.log( isNonPositiveFinite( 'beep' ) );
+// => false
+
+console.log( isNonPositiveFinite( null ) );
+// => false
+
+console.log( isNonPositiveFinite( 5 ) );
+// => false
+
+console.log( isNonPositiveFinite( true ) );
+// => false
+
+console.log( isNonPositiveFinite( {} ) );
+// => false
+
+console.log( isNonPositiveFinite( function beep() {} ) );
+// => false
diff --git a/is-nonpositive-finite/lib/index.js b/is-nonpositive-finite/lib/index.js
new file mode 100644
index 00000000..6b711e3e
--- /dev/null
+++ b/is-nonpositive-finite/lib/index.js
@@ -0,0 +1,55 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Test if a value is a nonpositive finite number.
+*
+* @module @stdlib/assert/is-nonpositive-finite
+*
+* @example
+* var isNonPositiveFinite = require( '@stdlib/assert/is-nonpositive-finite' );
+*
+* var bool = isNonPositiveFinite( -2 );
+* // returns true
+*
+* bool = isNonPositiveFinite( 3 );
+* // returns false
+*
+* bool = isNonPositiveFinite( 'beep' );
+* // returns false
+*/
+
+// MODULES //
+
+var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
+var main = require( './main.js' );
+var isPrimitive = require( './primitive.js' );
+var isObject = require( './object.js' );
+
+
+// MAIN //
+
+setReadOnly( main, 'isPrimitive', isPrimitive );
+setReadOnly( main, 'isObject', isObject );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/is-nonpositive-finite/lib/main.js b/is-nonpositive-finite/lib/main.js
new file mode 100644
index 00000000..6a756700
--- /dev/null
+++ b/is-nonpositive-finite/lib/main.js
@@ -0,0 +1,57 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/* eslint-disable no-unused-vars */
+'use strict';
+
+// MODULES //
+
+var NINF = require('@stdlib/constants/float64/ninf');
+var isPrimitive = require( './primitive.js' );
+var isObject = require( './object.js' );
+
+
+// MAIN //
+
+/**
+* Tests if a value is a nonpositive finite number.
+*
+* @param {*} value - value to test
+* @returns {boolean} boolean indicating if a value is non positive finite
+*
+* @example
+* var bool = isNonPositiveFinite( -3.0 );
+* // returns true
+*
+* @example
+* var bool = isNonPositiveFinite( new Number( -3.0 ) );
+* // returns true
+*
+* @example
+* var bool = isNonPositiveFinite( -Infinity );
+* // returns false
+*/
+function isNonPositiveFinite( value ) {
+	return (
+		isPrimitive(value) || isObject(value));
+}
+
+
+// EXPORTS //
+
+module.exports = isNonPositiveFinite;
diff --git a/is-nonpositive-finite/lib/object.js b/is-nonpositive-finite/lib/object.js
new file mode 100644
index 00000000..e79cd840
--- /dev/null
+++ b/is-nonpositive-finite/lib/object.js
@@ -0,0 +1,51 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2018 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var NINF = require( '@stdlib/constants/float64/ninf' );
+var isNumber = require( './../../is-number' ).isObject;
+
+
+// MAIN //
+
+/**
+* Tests if a value is a number object having a non positive finite value.
+*
+* @param {*} value - value to test
+* @returns {boolean} boolean indicating if a value is non positive finite
+*
+* @example
+* var bool = isNonPositiveFinite( -3.0 );
+* // returns false
+*
+* @example
+* var bool = isNonPositiveFinite( new Number( -3.0 ) );
+* // returns true
+*/
+function isNonPositiveFinite( value ) {
+	return (
+		isNumber( value ) && value.valueOf() <=0 && value.valueOf() !== NINF);
+}
+
+
+// EXPORTS //
+
+module.exports = isNonPositiveFinite;
diff --git a/is-nonpositive-finite/lib/primitive.js b/is-nonpositive-finite/lib/primitive.js
new file mode 100644
index 00000000..1a18c0ea
--- /dev/null
+++ b/is-nonpositive-finite/lib/primitive.js
@@ -0,0 +1,50 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2018 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var NINF = require( '@stdlib/constants/float64/ninf' );
+var isNumber = require( './../../is-number' ).isPrimitive;
+
+
+// MAIN //
+
+/**
+* Tests if a value is a number primitive having a non positive finite value.
+*
+* @param {*} value - value to test
+* @returns {boolean} boolean indicating if a value is non positive finite
+*
+* @example
+* var bool = isNonPositiveFinite( -3.0 );
+* // returns true
+*
+* @example
+* var bool = isNonPositiveFinite( new Number( -3.0 ) );
+* // returns false
+*/
+function isNonPositiveFinite( value ) {
+	return ( isNumber( value ) && value <=0 && value !== NINF );
+}
+
+
+// EXPORTS //
+
+module.exports = isNonPositiveFinite;
diff --git a/is-nonpositive-finite/package.json b/is-nonpositive-finite/package.json
new file mode 100644
index 00000000..1a04748f
--- /dev/null
+++ b/is-nonpositive-finite/package.json
@@ -0,0 +1,71 @@
+{
+    "name": "@stdlib/assert/is-nonpositive-finite",
+    "version": "0.0.0",
+    "description": "Test if a value is a number having a nonpositive finite value.",
+    "license": "Apache-2.0",
+    "author": {
+      "name": "The Stdlib Authors",
+      "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+    },
+    "contributors": [
+      {
+        "name": "The Stdlib Authors",
+        "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+      }
+    ],
+    "main": "./lib",
+    "directories": {
+      "benchmark": "./benchmark",
+      "doc": "./docs",
+      "example": "./examples",
+      "lib": "./lib",
+      "test": "./test"
+    },
+    "types": "./docs/types",
+    "scripts": {},
+    "homepage": "https://github.com/stdlib-js/stdlib",
+    "repository": {
+      "type": "git",
+      "url": "git://github.com/stdlib-js/stdlib.git"
+    },
+    "bugs": {
+      "url": "https://github.com/stdlib-js/stdlib/issues"
+    },
+    "dependencies": {},
+    "devDependencies": {},
+    "engines": {
+      "node": ">=0.10.0",
+      "npm": ">2.7.0"
+    },
+    "os": [
+      "aix",
+      "darwin",
+      "freebsd",
+      "linux",
+      "macos",
+      "openbsd",
+      "sunos",
+      "win32",
+      "windows"
+    ],
+    "keywords": [
+      "stdlib",
+      "stdassert",
+      "assertion",
+      "assert",
+      "utilities",
+      "utility",
+      "utils",
+      "util",
+      "number",
+      "numeric",
+      "nonpositive",
+      "is",
+      "isnumber",
+      "isnumeric",
+      "type",
+      "check",
+      "primitive",
+      "object"
+    ]
+  }
\ No newline at end of file
diff --git a/is-nonpositive-finite/test/test.js b/is-nonpositive-finite/test/test.js
new file mode 100644
index 00000000..504034e3
--- /dev/null
+++ b/is-nonpositive-finite/test/test.js
@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2018 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var isNonPositiveFinite = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof isNonPositiveFinite, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'attached to the main export is a method to test for a primitive number having a nonpositive finite number value', function test( t ) {
+	t.equal( typeof isNonPositiveFinite.isPrimitive, 'function', 'export is a function' );
+	t.end();
+});
+
+tape( 'attached to the main export is a method to test for a number object having a nonpositive finite number value', function test( t ) {
+	t.equal( typeof isNonPositiveFinite.isObject, 'function', 'export is a function' );
+	t.end();
+});
diff --git a/is-nonpositive-finite/test/test.main.js b/is-nonpositive-finite/test/test.main.js
new file mode 100644
index 00000000..08544f3f
--- /dev/null
+++ b/is-nonpositive-finite/test/test.main.js
@@ -0,0 +1,64 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var NINF = require('@stdlib/constants/float64/ninf');
+var Number = require( '@stdlib/number/ctor' );
+var isNonPositiveFinite = require( './../lib/main.js' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof isNonPositiveFinite, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function returns `true` if provided a number having a nonpositive finite number value', function test( t ) {
+	t.equal( isNonPositiveFinite( -5.0 ), true, 'returns true' );
+	t.equal( isNonPositiveFinite( new Number( -5.0 ) ), true, 'returns true' );
+	t.end();
+});
+
+tape( 'the function returns `false` if not provided a number having a nonpositive finite number value', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		'5',
+		3.14,
+		NINF,
+		1.0,
+		null,
+		true,
+		void 0,
+		[],
+		{},
+		function noop() {}
+	];
+
+	for ( i = 0; i < values.length; i++ ) {
+		t.equal( isNonPositiveFinite( values[i] ), false, 'returns false when provided '+values[i] );
+	}
+	t.end();
+});
diff --git a/is-nonpositive-finite/test/test.object.js b/is-nonpositive-finite/test/test.object.js
new file mode 100644
index 00000000..d74803bb
--- /dev/null
+++ b/is-nonpositive-finite/test/test.object.js
@@ -0,0 +1,67 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var Number = require( '@stdlib/number/ctor' );
+var isNonPositiveFinite = require( './../lib/object.js' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof isNonPositiveFinite, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function returns `true` if provided a number object having a nonpositive finite number value', function test( t ) {
+	t.equal( isNonPositiveFinite( new Number( -5.0 ) ), true, 'returns true' );
+	t.end();
+});
+
+tape( 'the function returns `false` if provided a primitive number, even if the number is a nonpositive finite number value', function test( t ) {
+	t.equal( isNonPositiveFinite( -3.0 ), false, 'returns false' );
+	t.end();
+});
+
+tape( 'the function returns `false` if not provided a number', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		'5',
+		null,
+		true,
+		void 0,
+		[],
+		{},
+		new Date(),
+		/./,
+		new RegExp( '.' ), // eslint-disable-line prefer-regex-literals
+		function noop() {}
+	];
+
+	for ( i = 0; i < values.length; i++ ) {
+		t.equal( isNonPositiveFinite( values[i] ), false, 'returns false when provided '+values[i] );
+	}
+	t.end();
+});
diff --git a/is-nonpositive-finite/test/test.primitive.js b/is-nonpositive-finite/test/test.primitive.js
new file mode 100644
index 00000000..24af87b9
--- /dev/null
+++ b/is-nonpositive-finite/test/test.primitive.js
@@ -0,0 +1,64 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var Number = require( '@stdlib/number/ctor' );
+var isNonPositiveFinite = require( './../lib/primitive.js' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof isNonPositiveFinite, 'function', 'main export is a function' );
+	t.end();
+});
+
+tape( 'the function returns `true` if provided a primitive number having a nonpositive finite number value', function test( t ) {
+	t.equal( isNonPositiveFinite( -3.0 ), true, 'returns true' );
+	t.end();
+});
+
+tape( 'the function returns `false` if provided a number object, even if the number has a nonpositive finite number value', function test( t ) {
+	t.equal( isNonPositiveFinite( new Number( -5.0 ) ), false, 'returns false' );
+	t.end();
+});
+
+tape( 'the function returns `false` if not provided a number', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		'-5',
+		null,
+		true,
+		void 0,
+		[],
+		{},
+		function noop() {}
+	];
+
+	for ( i = 0; i < values.length; i++ ) {
+		t.equal( isNonPositiveFinite( values[i] ), false, 'returns false when provided '+values[i] );
+	}
+	t.end();
+});