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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.

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

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.

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

Head to head

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

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

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.

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

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