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Side-by-side comparison

Pick up to four tools and compare adoption, momentum and maintenance at a glance. The crown marks the leader in each row.

Standalone spies, stubs, mocks and fake timers for any JavaScript test framework.

Mock Service Worker: intercepts network requests to mock APIs in tests, Storybook and the browser.

The most popular mocking framework for Java unit tests, with a clean verify/when API.

HTTP API simulator for stubbing and recording external services, run in-JVM, standalone or in Docker.

Head to head

Metric	Sinon.JS	MSW	Mockito	WireMock
Stars	9.8k	18.3k	15.4k	7.4k
Weekly downloads	13.3M	33.5M	n/a	n/a
Download growth	-3%	+35%	n/a	n/a
Popularity score	81/100	86/100	76/100	71/100
Forks	816	647	2.7k	1.5k
Open issues	56	16	503	506
Last commit	1w ago	6d ago	6d ago	1w ago
Latest version	22.1.0	3.0.5	n/a	n/a
License	n/a	MIT	MIT	Apache-2.0
First released	2010	2018	2012	2011
Signals	None	Popular	Popular	Popular
Listed in	Testing & QA › Mocking & Test Doubles	Frontend › Frontend Testing Testing & QA › Mocking & Test Doubles	Testing & QA › Mocking & Test Doubles	Testing & QA › Mocking & Test Doubles

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): Mockito, WireMock.

Standalone spies, stubs, mocks and fake timers for any JavaScript test framework.

Mock Service Worker: intercepts network requests to mock APIs in tests, Storybook and the browser.

The most popular mocking framework for Java unit tests, with a clean verify/when API.

HTTP API simulator for stubbing and recording external services, run in-JVM, standalone or in Docker.

Metric	Sinon.JS	MSW	Mockito	WireMock
Stars	9.8k	18.3k	15.4k	7.4k
Weekly downloads	13.3M	33.5M	n/a	n/a
Download growth	-3%	+35%	n/a	n/a
Popularity score	81/100	86/100	76/100	71/100
Forks	816	647	2.7k	1.5k
Open issues	56	16	503	506
Last commit	1w ago	6d ago	6d ago	1w ago
Latest version	22.1.0	3.0.5	n/a	n/a
License	n/a	MIT	MIT	Apache-2.0
First released	2010	2018	2012	2011
Signals	None	Popular	Popular	Popular
Listed in	Testing & QA › Mocking & Test Doubles	Frontend › Frontend Testing Testing & QA › Mocking & Test Doubles	Testing & QA › Mocking & Test Doubles	Testing & QA › Mocking & Test Doubles

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): Mockito, WireMock.