Best API Mocking Tools in 2026
Updated
In short: Microcks is ranked #1 of 27 as of 5 October 2026, ahead of Mockzilla and Parasoft SOAtest. 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 a live service is unavailable or still being built, a mock can give development work a way to exercise API interactions. Compare supported protocols and request matching, then consider whether dynamic responses, OpenAPI import, and mock data generation fit your workflow. Local deployment, free plans, and paid-from pricing offer further points to weigh. Microcks, Mockzilla, and Parasoft SOAtest are among the options, alongside WireMock and MockServer. Consider which setup and response capabilities you need, and compare the listed details to see how each tool describes its approach to creating and running mocks.
27 API mocking tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
27ranked
13free plans on this page
$0.02/molowest paid tier
5 Oct 2026last checked
Input list API Mocking Tools 25 channels on this page · 85 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromDynamic responsesOpenAPI importRequest matchingMock data generationLocal deploymentSupported protocols Spec sheet Score
01 Microcks Free planYesPaid fromnot statedDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 1/8spec lines stated 7.6
02 Mockzilla Free planYesPaid from$10/moDynamic responsesYesOpenAPI importYesRequest matchingnot statedMock data generationYesLocal deploymentYesSupported protocolsHTTP 7/8spec lines stated 7.6
03 Parasoft SOAtest Free planYesPaid fromnot statedDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 1/8spec lines stated 7.6
04 WireMock Free planYesPaid fromnot statedDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 1/8spec lines stated 7.6
05 Mockttp Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentYesSupported protocolsHTTP, HTTPS, WebSocket, JSON-RPC 3/8spec lines stated 7.4
06 Mockoon Free planYesPaid from$100/moDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 2/8spec lines stated 7.3
07 MockServer Free planYesPaid fromnot statedDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 1/8spec lines stated 7.3
08 WireMock Free planYesPaid fromnot statedDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 1/8spec lines stated 7.3
09 Mockfly Free planYesPaid fromnot statedDynamic responsesYesOpenAPI importYesRequest matchingnot statedMock data generationYesLocal deploymentYesSupported protocolsREST, WebSocket 6/8spec lines stated 7.2
10 Hoverfly Free planNoPaid from$10/moDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 2/8spec lines stated 7.1
11 Knockout API Free planYesPaid fromnot statedDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 1/8spec lines stated 7.1
12 Imposter Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importYesRequest matchingnot statedMock data generationYesLocal deploymentYesSupported protocolsREST, OpenAPI, SOAP, gRPC, WebSocket, HBase, Salesforce, WireMock 5/8spec lines stated 7.0
13 moqapi.dev Free planYesPaid from$29/moDynamic responsesYesOpenAPI importYesRequest matchingnot statedMock data generationYesLocal deploymentNoSupported protocolsREST, GraphQL, SOAP 7/8spec lines stated 7.0
14 MockAPI Free planYesPaid fromnot statedDynamic responsesYesOpenAPI importYesRequest matchingnot statedMock data generationYesLocal deploymentnot statedSupported protocolsREST 5/8spec lines stated 6.9
15 Mocki Free planNoPaid from$15/moDynamic responsesYesOpenAPI importnot statedRequest matchingnot statedMock data generationYesLocal deploymentYesSupported protocolsREST, GraphQL 6/8spec lines stated 6.8
16 OpenAPI Mock Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importYesRequest matchingnot statedMock data generationYesLocal deploymentYesSupported protocolsHTTP 5/8spec lines stated 6.8
17 Stoplight Elements Free planYesPaid fromnot statedDynamic responsesnot statedOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 1/8spec lines stated 6.8
18 MockWebServer Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importnot statedRequest matchingpathMock data generationnot statedLocal deploymentYesSupported protocolsHTTP, HTTPS, HTTP/2 4/8spec lines stated 6.6
19 json-server Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importnot statedRequest matchingnot statedMock data generationYesLocal deploymentYesSupported protocolsREST 4/8spec lines stated 6.5
20 Mock Service Worker Free planYesPaid fromnot statedDynamic responsesYesOpenAPI importYesRequest matchingnot statedMock data generationnot statedLocal deploymentYesSupported protocolsHTTP, REST, GraphQL, WebSocket, SSE 5/8spec lines stated 6.5
21 OpenAPI Server Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importYesRequest matchingpathMock data generationnot statedLocal deploymentYesSupported protocolshttp, https 5/8spec lines stated 6.5
22 API-Mocked Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importnot statedRequest matchingpathMock data generationnot statedLocal deploymentYesSupported protocolsHTTP, HTTPS, WebSockets 4/8spec lines stated 6.2
23 MockPilot Free plannot statedPaid fromnot statedDynamic responsesnot statedOpenAPI importnot statedRequest matchingpathMock data generationnot statedLocal deploymentYesSupported protocolsHTTP, REST 3/8spec lines stated 6.2
24 Pretender.js Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importnot statedRequest matchingnot statedMock data generationnot statedLocal deploymentnot statedSupported protocolsnot stated 1/8spec lines stated 6.2
25 Mirage JS Free plannot statedPaid fromnot statedDynamic responsesYesOpenAPI importnot statedRequest matchingnot statedMock data generationYesLocal deploymentYesSupported protocolsREST, GraphQL 4/8spec lines stated 5.7
Compare all 25 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Dynamic responses | OpenAPI import |
|---|---|---|---|---|---|---|---|---|
| 1 | Microcks | 7.6 | Free plan | Free | Yes | — | — | — |
| 2 | Mockzilla | 7.6 | Free plan | $10/mo | Yes | 10 /mo | Yes | Yes |
| 3 | Parasoft SOAtest | 7.6 | No | — | Yes | — | — | — |
| 4 | WireMock | 7.6 | Free plan | Free | Yes | — | — | — |
| 5 | Mockttp | 7.4 | Free plan | Free | — | — | Yes | — |
| 6 | Mockoon | 7.3 | No | €10/mo | Yes | 100 /mo | — | — |
| 7 | MockServer | 7.3 | Free plan | Free | Yes | — | — | — |
| 8 | WireMock | 7.3 | Free plan | Free | Yes | — | — | — |
| 9 | Mockfly | 7.2 | Free plan | €15/mo | Yes | — | Yes | Yes |
| 10 | Hoverfly | 7.1 | No | $10/mo | No | 10 /mo | — | — |
| 11 | Knockout API | 7.1 | Free plan | $0.02/mo | Yes | — | — | — |
| 12 | Imposter | 7.0 | No | — | — | — | Yes | Yes |
| 13 | moqapi.dev | 7.0 | Free plan | $29/mo | Yes | 29 /mo | Yes | Yes |
| 14 | MockAPI | 6.9 | Free plan | $2.92/mo | Yes | — | Yes | Yes |
| 15 | Mocki | 6.8 | No | $15/mo | No | 15 /mo | Yes | — |
| 16 | OpenAPI Mock | 6.8 | No | — | — | — | Yes | Yes |
| 17 | Stoplight Elements | 6.8 | Free plan | Free | Yes | — | — | — |
| 18 | MockWebServer | 6.6 | Free plan | Free | — | — | Yes | — |
| 19 | json-server | 6.5 | Free plan | Free | — | — | Yes | — |
| 20 | Mock Service Worker | 6.5 | No | — | Yes | — | Yes | Yes |
| 21 | OpenAPI Server | 6.5 | No | — | — | — | Yes | Yes |
| 22 | API-Mocked | 6.2 | No | — | — | — | Yes | — |
| 23 | MockPilot | 6.2 | No | — | — | — | — | — |
| 24 | Pretender.js | 6.2 | No | — | — | — | Yes | — |
| 25 | Mirage JS | 5.7 | No | — | — | — | Yes | — |
Is your tool on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which API mocking tool is ranked first on Specifiction?
Microcks is ranked #1 of 27 with a score of 7.6. Mockzilla is second and Parasoft SOAtest third.
How many of these have a free plan?
13 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 on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.
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