diff --git a/.travis.yml b/.travis.yml
index ad51870..7683281 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,25 +4,25 @@ python:
 - 3.4
 - 3.5
 - 3.6
+- 3.7
 install:
-- PACKAGE_VERSION=`python setup.py --version`
-- TAG_NAME=v$PACKAGE_VERSION
-- pip install --upgrade pip
-- pip install .
-- pip install -r requirements.txt
-- pip install -r test_requirements.txt
+- pipenv install --dev
+- pipenv install -e .
 before_install:
 - export TRAVIS_COMMIT_MESSAGE=$(git log --format=%B -n 1 $TRAVIS_COMMIT)
 - echo "$TRAVIS_COMMIT_MESSAGE"
+- PACKAGE_VERSION=`python setup.py --version`
+- TAG_NAME=v$PACKAGE_VERSION
+- pip install --upgrade pip
+- pip install pipenv
 script:
 - 'sh test.sh'
 - ( if [ -n "$TRAVIS_TAG" ]; then if [ $TAG_NAME != $TRAVIS_TAG ]; then echo "This tag is for the wrong version. Got \"$TRAVIS_TAG\" expected \"$TAG_NAME\"."; exit 1; fi; fi; )
 after_success:
-- pip install coveralls
-- coveralls
+- pipenv run coveralls
 before_deploy:
 # create the documentation
-- pip install wheel
+- pipenv pip install wheel
 deploy:
   provider: pypi
   user: rienafairefr
diff --git a/Pipfile b/Pipfile
new file mode 100644
index 0000000..5a8453f
--- /dev/null
+++ b/Pipfile
@@ -0,0 +1,27 @@
+[[source]]
+
+url = "https://pypi.python.org/simple"
+verify_ssl = true
+name = "pypi"
+
+
+[dev-packages]
+
+mock = "*"
+coveralls = "*"
+nose = "*"
+
+
+[packages]
+
+configargparse = "*"
+configparser = "*"
+requests = "*"
+jsontableschema = "==0.10.0"
+aenum = "*"
+sqlalchemy = "*"
+lxml = "==3.8.0"
+ofxtools = {ref = "4a3e496d7d2a3babdeabd4e114d98fc5f2862667", git = "https://github.com/csingley/ofxtools.git", editable = true}
+pynab = "*"
+bcrypt = "*"
+"functools32" = "*"
\ No newline at end of file
diff --git a/Pipfile.lock b/Pipfile.lock
new file mode 100644
index 0000000..ea940d4
--- /dev/null
+++ b/Pipfile.lock
@@ -0,0 +1,722 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "46f7c620764cf4bb726dde35ed0faefb342c32d87abe32a5535085a8fac05298"
+        },
+        "host-environment-markers": {
+            "implementation_name": "cpython",
+            "implementation_version": "0",
+            "os_name": "posix",
+            "platform_machine": "x86_64",
+            "platform_python_implementation": "CPython",
+            "platform_release": "4.4.0-97-generic",
+            "platform_system": "Linux",
+            "platform_version": "#120-Ubuntu SMP Tue Sep 19 17:28:18 UTC 2017",
+            "python_full_version": "2.7.12",
+            "python_version": "2.7",
+            "sys_platform": "linux2"
+        },
+        "pipfile-spec": 6,
+        "requires": {},
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.python.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "aenum": {
+            "hashes": [
+                "sha256:a900d73c437fcd154cfc447a8ab0d106f2e8448be8d32c37de1218f9b5877c9b",
+                "sha256:cea03ffd7382ff1c355a286c9c47f4975853a9df9a206a413f0f0a7739076f8a",
+                "sha256:3209fa41b8c41345442e8d9b5158a57d3e96d84c3d5ebbe8e521e1e2eff1598d"
+            ],
+            "version": "==2.0.8"
+        },
+        "bcrypt": {
+            "hashes": [
+                "sha256:f9210820ee4818d84658ed7df16a7f30c9fba7d8b139959950acef91745cc0f7",
+                "sha256:b1e8491c6740f21b37cca77bc64677696a3fb9f32360794d57fa8477b7329eda",
+                "sha256:9eced8962ce3b7124fe20fd358cf8c7470706437fa064b9874f849ad4c5866fc",
+                "sha256:346d6f84ff0b493dbc90c6b77136df83e81f903f0b95525ee80e5e6d5e4eef84",
+                "sha256:0f317e4ffbdd15c3c0f8ab5fbd86aa9aabc7bea18b5cc5951b456fe39e9f738c",
+                "sha256:f7fd3ed3745fe6e81e28dc3b3d76cce31525a91f32a387e1febd6b982caf8cdb",
+                "sha256:3b4c23300c4eded8895442c003ae9b14328ae69309ac5867e7530de8bdd7875d",
+                "sha256:34dd60b90b0f6de94a89e71fcd19913a30e83091c8468d0923a93a0cccbfbbff",
+                "sha256:2788c32673a2ad0062bea850ab73cffc0dba874db10d7a3682b6f2f280553f20",
+                "sha256:6efd9ca20aefbaf2e7e6817a2c6ed4a50ff6900fafdea1bcb1d0e9471743b144",
+                "sha256:f2fe545d27a619a552396533cddf70d83cecd880a611cdfdbb87ca6aec52f66b",
+                "sha256:e22f0997622e1ceec834fd25947dc2ee2962c2133ea693d61805bc867abaf7ea",
+                "sha256:c906bdb482162e9ef48eea9f8c0d967acceb5c84f2d25574c7d2a58d04861df1",
+                "sha256:43d1960e7db14042319c46925892d5fa99b08ff21d57482e6f5328a1aca03588",
+                "sha256:321d4d48be25b8d77594d8324c0585c80ae91ac214f62db9098734e5e7fb280f",
+                "sha256:ae35dbcb6b011af6c840893b32399252d81ff57d52c13e12422e16b5fea1d0fb",
+                "sha256:09a3b8c258b815eadb611bad04ca15ec77d86aa9ce56070e1af0d5932f17642a",
+                "sha256:988cac675e25133d01a78f2286189c1f01974470817a33eaf4cfee573cfb72a5",
+                "sha256:cb18ffdc861dbb244f14be32c47ab69604d0aca415bee53485fcea4f8e93d5ef",
+                "sha256:8629ea6a8a59f865add1d6a87464c3c676e60101b8d16ef404d0a031424a8491",
+                "sha256:a005ed6163490988711ff732386b08effcbf8df62ae93dd1e5bda0714fad8afb",
+                "sha256:d86da365dda59010ba0d1ac45aa78390f56bf7f992e65f70b3b081d5e5257b09",
+                "sha256:8569844a5d8e1fdde4d7712a05ab2e6061343ac34af6e7e3d7935b2bd1907bfd",
+                "sha256:0872eeecdf9a429c1420158500eedb323a132bc5bf3339475151c52414729e70",
+                "sha256:01477981abf74e306e8ee31629a940a5e9138de000c6b0898f7f850461c4a0a5",
+                "sha256:49e96267cd9be55a349fd74f9852eb9ae2c427cd7f6455d0f1765d7332292832",
+                "sha256:9a6fedda73aba1568962f7543a1f586051c54febbc74e87769bad6a4b8587c39",
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+                "sha256:67ed1a374c9155ec0840214ce804616de49c3df9c5bc66740687c1c9b1cd9e8d"
+            ],
+            "version": "==3.1.4"
+        },
+        "cchardet": {
+            "hashes": [
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+            ],
+            "version": "==1.1.3"
+        },
+        "certifi": {
+            "hashes": [
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+            "version": "==2017.7.27.1"
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+        "cffi": {
+            "hashes": [
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+        "et-xmlfile": {
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+            ],
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+        },
+        "jsonlines": {
+            "hashes": [
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+            "version": "==1.2.0"
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+        "jsonschema": {
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+            "version": "==1.0.0"
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+        "lxml": {
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+                "sha256:f9e83b39d29c2815a38e4118d776b482d4082b5bf9c9147fbc99a3f83abe480a",
+                "sha256:700040c354f0230287906b1276635552a3def4b646e0145555bc9e2e5da9e365",
+                "sha256:7f1eacae700c66c3d7362a433b228599c9d94a5a3a52613dddd9474e04deb6bc",
+                "sha256:13ef9f799c8fb45c446a239df68034de3a6f3de274881b088bebd7f5661f79f8",
+                "sha256:dfb011587e2b7299112f08a2a60d2601706aac9abde37aa1177ea825adaed923",
+                "sha256:381be5d31d3f0d912334cf2c159bc7bea6bfe6b0e3df6061a3bf2bf88359b1f6",
+                "sha256:83a477ac4f55a6ef59552683a0544d47b68a85ce6a80fd0ca6b3dc767f6495fb",
+                "sha256:dfd35f1979da31bcabbe27bcf78d4284d69870731874af629082590023a77336",
+                "sha256:9681efc2d310cfc53863cc6f63e88ebe7a48124550fa822147996cb09390b6ab",
+                "sha256:53770b20ac5b4a12e99229d4bae57af0945be87cc257fce6c6c7571a39f0c5d4",
+                "sha256:8801880d32f11b6df11c32a961e186774b4634ae39d7c43235f5a24368a85f07",
+                "sha256:16db2c69a1acbcb3c13211e9f954e22b22a729909d81f983b6b9badacc466eda",
+                "sha256:ef43a06a960b46c73c018704051e023ee6082030f145841ffafc8728039d5a88",
+                "sha256:c3e2736664a6074fc9bd54fb643f5af0fc60bfedb2963b3d3f98c7450335e34c",
+                "sha256:17709e22e4c9f5412ba90f446fb13b245cc20bf4a60377021bbff6c0f1f63e7c",
+                "sha256:a2f7106d1167825c4115794c2ba57cc3b15feb6183db5328fa66f94c12902d8b",
+                "sha256:2a08e978f402696c6956eee9d1b7e95d3ad042959b71bafe1f3e4557cbd6e0ac",
+                "sha256:57f510bb16efaec0b6f371b64a8000c62e7e3b3e48e8b0a5745ade078d849814",
+                "sha256:0f1883eab9c19aa243f51308751b8a2a547b9b817b721cc0ecf3efb99fafbea7",
+                "sha256:e00fe141e22ce6e9395aa24d862039eb180c6b7e89df0bbaf9765e9aebe560a9",
+                "sha256:ec596e4401553caa6dd2e3349ce47f9ef82c1f1bcba5d8ac3342724f0df8d6ff",
+                "sha256:c820a533a943ebc860acc0ce6a00dd36e0fdf2c6f619ff8225755169428c5fa2",
+                "sha256:b7f7283eb7badd2b8a9c6a9d6eeca200a0a24db6be79baee2c11398f978edcaa",
+                "sha256:a5ed27ad3e8420b2d6b625dcbd3e59488c14ccc06030167bcf14ffb0f4189b77",
+                "sha256:d7b70b7b4eb14d0753d33253fe4f121ca99102612e2719f0993607deb30c6f33",
+                "sha256:4047dc83773869701bde934fb3c4792648eda7c0e008a77a0aec64157d246801",
+                "sha256:7a9c44400ee0f3b4546066e0710e1250fd75831adc02ab99dda176ad8726f424",
+                "sha256:0f649e68db74b1b5b8ca4161d08eb2b8fa8ae11af1ebfb80e80e112eb0ef5300",
+                "sha256:52964fae0fafef8bd283ad8e9a9665205a9fdf912535434defc0ec3def1da26b",
+                "sha256:36aa6c8db83bc27346ddcd8c2a60846a7178ecd702672689d3ea1828eb1a4d11",
+                "sha256:9824e15b387d331c0fc0fef905a539ab69784368a1d6ac3db864b4182e520948",
+                "sha256:4a678e1b9619a29c51301af61ab84122e2f8cc7a0a6b40854b808ac6be604300",
+                "sha256:8bb7c8dca54109b61013bc4114d96effbf10dea136722c586bce3a5d9fc4e730",
+                "sha256:1a41d621aa9b6ab6457b557a754d50aaff0813fad3453434de075496fca8a183",
+                "sha256:0fa423599fc3d9e18177f913552cdb34a8d9ad33efcf52a98c9d4b644edb42c5",
+                "sha256:e61a4ba0b2686040cb4828297c7e37bcaf3a1a1c0bc0dbe46cc789dde51a80fa",
+                "sha256:ce9ef0fc99d11d418662e36fd8de6d71b19ec87c2eab961a117cc9d087576e72"
+            ],
+            "version": "==4.4.1"
+        },
+        "coveralls": {
+            "hashes": [
+                "sha256:84dd8c88c5754e8db70a682f537e2781366064aa3cdd6b24c2dcecbd3181187c",
+                "sha256:510682001517bcca1def9f6252df6ce730fcb9831c62d9fff7c7d55b6fdabdf3"
+            ],
+            "version": "==1.2.0"
+        },
+        "cryptography": {
+            "hashes": [
+                "sha256:4d9223a76e1064220e8f2a67a7cf5835f3650f3d6bca6d2df3f51bc3541a91b4",
+                "sha256:407b5716a7b6f56a534e327d4daab6d958c993fcae9de7b391b4111dae7df81f",
+                "sha256:982e53d8057f800e610ff7fb54ca78d2fafe5f9564dfa784971828cc9973330a",
+                "sha256:f86b60f952aa9447e492f15c418ff7da6e863270afb67e817d268076bf187115",
+                "sha256:7241a25e44592d46d80c50878c09659a118c29a88b62f4e42d25be387dd4cca1",
+                "sha256:7cf2e5589fd96151479b51145a0f6c35d9a067dfaddedc2b22645a01c0556cb1",
+                "sha256:066f10b5c578f634b8018686ac143a45c31367f28221455b89e33e89e2b08229",
+                "sha256:d06982b636fc7c1ccbc5f1bfc9f832a0aeaa255d9dc991049e161157d7206c25",
+                "sha256:a481305ad61e0df657482f44d228e965c6dc9c828d3b9549ee4b56f653a7eafe",
+                "sha256:71d63ffeb8af430934b3df6492826c27ad8af9a6ce7d3193bf91f28610621b14",
+                "sha256:05cfb7dd9d885e635714d610f1b45abf4832007d48d01312c5dbdf664e33f5f7",
+                "sha256:d8923f90a6957c4bd65e8aa3ee29b372ee2b38bf67eeaa8b78005d51c703d5b1",
+                "sha256:1f17b32fd4873b59b33c05ad238584fc83ee43cc019c64fa2101e7b3fa6333bd",
+                "sha256:111b66fb69b087c3a982152604a20c577316734c4f48fc39e70cc924d1f6c927",
+                "sha256:4008b97d7144ceffd8e4079c52228f3624bcc7fc453cec748134f739981b4a18",
+                "sha256:1bebc3123deedd5f9dd4ad5223dc54e4ad95fa54ce22c41b86b8d239bca5fb19",
+                "sha256:36b731ed87ab744cadd0f3eeef40ce5bc7cbb5cdd743f0f689e4cc8ad0c227fe",
+                "sha256:c797bdc4c91a930d3e7f464d68017b6f5251539f107379277a9b023521f9fe7d",
+                "sha256:6d4a2a22b4d48b235c0986c9f5c54477bbd5849ca190771ea115dce33e573d65",
+                "sha256:13138c71b5111f3d0c17843865f66c75ef4875e1568229ddfd9e94f96e5624a2",
+                "sha256:6b15fcdbdca8dd082edbbc69f144e6fc5e663771f1ed5452ab04de4bb774cb14",
+                "sha256:f3d41cfc5b85cfdeb9cf1f1043c2f32043815c6b97db1c940e4e3c9d0a8ec821",
+                "sha256:c50481c2645c8dc579119ce768d82cb3022e8e8b4f39abb4946322fed753bf2e",
+                "sha256:362672bc69fd70e5429a31a10ec295de4e4cb5cf81384427821549b68861d7c5",
+                "sha256:8675fd29f0ef468ed87c62a00672b68f9f847126ed6ab0e4d238e9e9b030cedd",
+                "sha256:bc2eccac62239e8b67987ae4c2a12976da09a6e26366f187749a444cb83a3e3d",
+                "sha256:2699ed21e1f73dd1bdb7b0b22a517295de07809d535b23e200dd22166037fe6f"
+            ],
+            "version": "==2.1.1"
+        },
+        "docopt": {
+            "hashes": [
+                "sha256:49b3a825280bd66b3aa83585ef59c4a8c82f2c8a522dbe754a8bc8d08c85c491"
+            ],
+            "version": "==0.6.2"
+        },
+        "enum34": {
+            "hashes": [
+                "sha256:6bd0f6ad48ec2aa117d3d141940d484deccda84d4fcd884f5c3d93c23ecd8c79",
+                "sha256:644837f692e5f550741432dd3f223bbb9852018674981b1664e5dc339387588a",
+                "sha256:8ad8c4783bf61ded74527bffb48ed9b54166685e4230386a9ed9b1279e2df5b1",
+                "sha256:2d81cbbe0e73112bdfe6ef8576f2238f2ba27dd0d55752a776c41d38b7da2850"
+            ],
+            "markers": "python_version < '3'",
+            "version": "==1.1.6"
+        },
+        "funcsigs": {
+            "hashes": [
+                "sha256:330cc27ccbf7f1e992e69fef78261dc7c6569012cf397db8d3de0234e6c937ca",
+                "sha256:a7bb0f2cf3a3fd1ab2732cb49eba4252c2af4240442415b4abce3b87022a8f50"
+            ],
+            "markers": "python_version < '3.3'",
+            "version": "==1.0.2"
+        },
+        "idna": {
+            "hashes": [
+                "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4",
+                "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f"
+            ],
+            "version": "==2.6"
+        },
+        "ipaddress": {
+            "hashes": [
+                "sha256:d34cf15d95ce9a734560f7400a8bd2ac2606f378e2a1d0eadbf1c98707e7c74a",
+                "sha256:5d8534c8e185f2d8a1fda1ef73f2c8f4b23264e8e30063feeb9511d492a413e1"
+            ],
+            "version": "==1.0.18"
+        },
+        "mock": {
+            "hashes": [
+                "sha256:5ce3c71c5545b472da17b72268978914d0252980348636840bd34a00b5cc96c1",
+                "sha256:b158b6df76edd239b8208d481dc46b6afd45a846b7812ff0ce58971cf5bc8bba"
+            ],
+            "version": "==2.0.0"
+        },
+        "nose": {
+            "hashes": [
+                "sha256:dadcddc0aefbf99eea214e0f1232b94f2fa9bd98fa8353711dacb112bfcbbb2a",
+                "sha256:9ff7c6cc443f8c51994b34a667bbcf45afd6d945be7477b52e97516fd17c53ac",
+                "sha256:f1bffef9cbc82628f6e7d7b40d7e255aefaa1adb6a1b1d26c69a8b79e6208a98"
+            ],
+            "version": "==1.3.7"
+        },
+        "pbr": {
+            "hashes": [
+                "sha256:60c25b7dfd054ef9bb0ae327af949dd4676aa09ac3a9471cdc871d8a9213f9ac",
+                "sha256:05f61c71aaefc02d8e37c0a3eeb9815ff526ea28b3b76324769e6158d7f95be1"
+            ],
+            "version": "==3.1.1"
+        },
+        "pycparser": {
+            "hashes": [
+                "sha256:99a8ca03e29851d96616ad0404b4aad7d9ee16f25c9f9708a11faf2810f7b226"
+            ],
+            "version": "==2.18"
+        },
+        "pyopenssl": {
+            "hashes": [
+                "sha256:aade9985b93eaec51b0c0a2a60d14bb8dcff1ff8e36fe542e3c22812ec07315e",
+                "sha256:29630b9064a82e04d8242ea01d7c93d70ec320f5e3ed48e95fcabc6b1d0f6c76"
+            ],
+            "version": "==17.3.0"
+        },
+        "requests": {
+            "hashes": [
+                "sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b",
+                "sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e"
+            ],
+            "version": "==2.18.4"
+        },
+        "six": {
+            "hashes": [
+                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb",
+                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9"
+            ],
+            "version": "==1.11.0"
+        },
+        "urllib3": {
+            "hashes": [
+                "sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b",
+                "sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f"
+            ],
+            "markers": "python_version < '3'",
+            "version": "==1.22"
+        }
+    }
+}
diff --git a/pynYNAB/ClientFactory.py b/pynYNAB/ClientFactory.py
index 374ffb1..7cbe323 100644
--- a/pynYNAB/ClientFactory.py
+++ b/pynYNAB/ClientFactory.py
@@ -67,10 +67,10 @@ class Arg(object):pass
                     if not hasattr(args, 'password') or args.password is None:
                         raise NoCredentialsException
                 connection = nYnabConnection(args.email, args.password)
-                connection.init_session()
             else:
                 connection = args.connection
 
+            connection.init_session()
             client_id = connection.id
 
             def postprocessed_client(cl):
diff --git a/tests/test_persist.py b/tests/test_persist.py
index f8fdacf..aa2772d 100644
--- a/tests/test_persist.py
+++ b/tests/test_persist.py
@@ -11,6 +11,9 @@ class MockConnection(object):
     def __init__(self,id):
         self.id = id
 
+    def init_session(self):
+        pass
+
 
 class Args(object):
     budget_name = 'Test Budget'
diff --git a/tests/tests_operations.py b/tests/tests_operations.py
index d9498ff..ecf2449 100644
--- a/tests/tests_operations.py
+++ b/tests/tests_operations.py
@@ -25,6 +25,8 @@
 class MockConnection2(object):
     id='12345'
 
+    def init_session(self): pass
+
 factory = nYnabClientFactory('sqlite://')
 
 
@@ -38,6 +40,8 @@ def dorequest(this,request_dic, opname):
             user_id = '1234'
             id = '1234'
 
+            def init_session(self): pass
+
         self.client = factory.create_client(budgetname='', nynabconnection=MockConnection2(), sync=False)
         self.client.create_budget(budget_name='New Budget')
 
diff --git a/testscripts/offline_budget.py b/testscripts/offline_budget.py
new file mode 100644
index 0000000..a939c45
--- /dev/null
+++ b/testscripts/offline_budget.py
@@ -0,0 +1,124 @@
+import logging
+import os
+
+import datetime
+from pynYNAB.ClientFactory import nYnabClientFactory
+from sqlalchemy import create_engine
+import json
+import settings
+
+
+class MockConnection(object):
+    user_id = '1'
+    id = '1c1ba2d2-b31e-4b67-a76d-03c47cbf826b'
+    directory = None
+
+    def __init__(self, directory=None):
+        if directory is not None:
+            self.directory = directory
+
+    def init_session(self):
+        pass
+
+    def dorequest(self, request_dic, opname):
+        p = '{}/{}.json'.format(self.directory, opname)
+        if not os.path.exists(p):
+            return None
+        with open(p, 'r') as f:
+            data = json.load(f)
+            return data
+
+
+class nYnabOfflineClient(object):
+    def __new__(cls, *args, **kwargs):
+        connection = kwargs.pop('nynabconnection', None)
+
+        class Args(object):
+            budget_name = kwargs.pop('budgetname', None)
+            email = connection.email if hasattr(connection, 'email') else kwargs.pop('email', '')
+            password = connection.password if hasattr(connection, 'password') else kwargs.pop('password', '')
+            nynabconnection = connection
+            db_path = 'offline'
+
+        passed = Args()
+        if hasattr(passed, 'db_path'):
+            logging.info('Creating client from server...')
+            factory = nYnabClientFactory(
+                engine=create_engine('sqlite:///{}/{}.db'.format(passed.db_path, settings.ynab_budget)))
+        else:
+            logging.info('Creating client from database...')
+            factory = nYnabClientFactory(engine=create_engine('sqlite:///:memory:'))
+        return factory.create_client(passed, sync=False)
+
+
+class OfflineBudget:
+    directory = 'offline'
+
+    def __init__(self, action='load'):
+        # create directory where to store the offline budget
+        self.client = None
+        try:
+            os.mkdir(self.directory)
+        except OSError as e:
+            if e.errno == 17:
+                pass
+            else:
+                raise e
+
+        if action == 'load':
+            self.client = self.load_offline_client()
+        else:
+            self.sync_offline_client()
+
+    def write_file(self, client, entity):
+        a = getattr(client, entity)
+        with open('{}/{}-{}.json'.format(self.directory, entity, settings.ynab_budget), 'w') as f:
+            data = a.get_dict()
+            logging.info('Writing {}: {}'.format(entity, data))
+            json.dump(data, f)
+
+    def read_file(self, entity):
+        with open('{}/{}-{}.json'.format(self.directory, entity, settings.ynab_budget), 'r') as f:
+            data = json.load(f)
+            logging.info('Found {}: {}'.format(entity, data))
+            return data
+
+    def sync_offline_client(self):
+        client = nYnabOfflineClient(email=settings.ynab_username, password=settings.ynab_password,
+                                    budgetname=settings.ynab_budget,
+                                    logger=settings.log, db_path=self.directory)
+        if os.path.exists('{}/db-{}.db'.format(self.directory, settings.ynab_budget)):
+            try:
+                self.read_file('budget')
+                self.read_file('catalog')
+                logging.warn('Old offline budget found. Skipping...')
+                return
+            except (ValueError, IOError) as e:
+                logging.info('Error parsing offline files: {}'.format(e.message))
+
+        client.sync()
+        self.write_file(client, 'budget')
+        self.write_file(client, 'catalog')
+
+    def load_offline_client(self):
+        try:
+            self.client = self._load()
+        except (IOError, AttributeError, ValueError) as e:
+            self.sync_offline_client()
+            self.client = self._load()
+
+        logging.debug('Loaded offline client')
+        return self.client
+
+    def _load(self):
+        client = nYnabOfflineClient(email=settings.ynab_username, password=settings.ynab_password,
+                                    budgetname=settings.ynab_budget,
+                                    logger=settings.log, nynabconnection=MockConnection(directory=self.directory))
+        client.budget.from_dict(self.read_file('budget'))
+        client.catalog.from_dict(self.read_file('catalog'))
+        return client
+
+
+if __name__ == '__main__':
+    OfflineBudget(action='load')
+