Best API Mocking Tools in 2026
Updated
In short: Microcks is ranked #1 of 27 as of 4 October 2026, ahead of Mockzilla and MockServer. The best-ranked option with a free plan is Mockzilla. The lowest first paid tier on this page is Knockout API at $0.02/mo.
When you need to develop or test against simulated APIs, compare how each tool handles responses and requests. MockServer and WireMock lead the ranking, with WireMock appearing twice among the first entries, followed by Microcks and Beeceptor. Compared on supported protocols and request matching, the entries also cover dynamic responses, OpenAPI import, and mock data generation. Local deployment may be relevant to how you plan to run mocks; free-plan availability and paid-from pricing give you further ways to assess fit. Use the listed capabilities to compare the options with your development workflow and preferred setup.
27 API mocking tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
10 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | MicrocksWeb · Windows · Mac · Linux · Self-hosted · API · Extension | Three bars | — | 4 of 6 | Free | 6.7 | |
| 2 | MockzillaWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | $10/mo | 6.7 | |
| 3 | MockServerWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | Free | 6.6 | |
| 4 | WireMockWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | Free | 6.6 | |
| 5 | MockflyWeb · Linux · Self-hosted · API · Extension | Two bars | — | 2 of 6 | €15/mo | 6.5 | |
| 6 | Knockout APIWeb · API | Two bars | — | 1 of 6 | $0.02/mo | 6.4 | |
| 7 | MockAPIWeb · API | Two bars | — | 1 of 6 | $2.92/mo | 6.4 | |
| 8 | moqapi.devWeb · API | Two bars | — | 1 of 6 | $29/mo | 6.4 | |
| 9 | WireMockWeb · Linux · Self-hosted · API | Two bars | — | 2 of 6 | Free | 6.4 | |
| 10 | Stoplight ElementsWeb · Self-hosted | Two bars | — | 1 of 6 | Free | 6.3 | |
| 11 | Parasoft SOAtestWindows · Mac · Linux · Android · iPhone · Self-hosted · API | Two bars | — | — | 5 of 6 | — | 5.7 |
| 12 | ImposterWindows · Mac · Linux · Self-hosted | Two bars | — | — | 3 of 6 | — | 5.6 |
| 13 | OpenAPI MockWindows · Linux · Self-hosted | One bar | — | — | 2 of 6 | — | 5.5 |
| 14 | Mock Service WorkerWeb · Self-hosted | One bar | — | — | 1 of 6 | — | 5.4 |
| 15 | MockiWeb · Self-hosted · API | One bar | — | — | 1 of 6 | $15/mo | 5.4 |
| 16 | MockoonWeb · Windows · Mac · Linux · Self-hosted · API | One bar | — | — | 4 of 6 | €10/mo | 5.3 |
| 17 | HoverflyWeb · Windows · Mac · Linux · Self-hosted · API | Two bars | — | — | 4 of 6 | $10/mo | 5.2 |
| 18 | Mirage JSWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 19 | API-MockedNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 20 | BeeceptorWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 21 | json-serverNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 22 | MockttpWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 23 | MockWebServerNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 24 | OpenAPI ServerSelf-hosted | No signal | — | — | 0 of 6 | — | 5.1 |
| 25 | MockPilotNo platforms listed | No signal | — | — | 0 of 6 | — | 5.0 |
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which API mocking tool is ranked first on Freedom251?
Microcks is ranked #1 of 27 with a score of 6.7. Mockzilla is second and MockServer third.
How many of these have a free plan?
10 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Knockout API has the lowest first paid tier we found: $0.02/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation. Paid placements never change a rank.