# Microcks vs Mock Service Worker (MSW)

**Leader by vioscaleAI score:** Mock Service Worker (MSW)

| Attribute | Microcks | Mock Service Worker (MSW) |
|---|---|---|
| **vioscaleAI score** | 50.2 (78% (high)) | 60.5 (79% (high)) |
| activity.commits_last_30d | 32 | 15 |
| adoption.dependent_repos | 8 | 11,851 |
| adoption.github_stars | 2,044 | 18,290 |
| content.faq | `[{"answer":"An open source platform that creates mock APIs and performs contract testing across multiple API specification formats including OpenAPI, AsyncAPI, gRPC, GraphQL, and SOAP to accelerate API development and validation. It is indexed under API Mocking.","source":"https://microcks.io","question":"What is Microcks?","confidence":0.6},{"answer":"Microcks is open source, so it can be self-hosted and used at no licence cost. It is released under the Apache-2.0 licence. Pricing changes often, so verify at source before relying on it.","source":"https://microcks.io","question":"Is Microcks free to use?","confidence":0.6},{"answer":"We have confirmed browser-based access to Microcks. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://microcks.io","question":"What platforms does Microcks support?","confidence":0.6},{"answer":"Yes. Microcks can be deployed cloud / SaaS and on-premise, so it does not have to run on the vendor's infrastructure.","source":"https://microcks.io","question":"Can Microcks be self-hosted?","confidence":0.6},{"answer":"We have confirmed 10 integrations for Microcks, including Postman, OpenAI, Keycloak, Backstage, Docker Desktop, OpenAPI, AsyncAPI and gRPC, plus 2 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://microcks.io","question":"What does Microcks integrate with?","confidence":0.6},{"answer":"Yes. Microcks is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/microcks/microcks","question":"Is Microcks open source?","confidence":0.95}]` | `[{"answer":"An API mocking library that intercepts network requests at the browser and Node.js levels, allowing consistent mock responses across testing frameworks, tools, and applications without requiring client-specific stubs or configuration. It is indexed under API Mocking.","source":"https://mswjs.io","question":"What is Mock Service Worker (MSW)?","confidence":0.6},{"answer":"Mock Service Worker (MSW) is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.","source":"https://mswjs.io","question":"Is Mock Service Worker (MSW) free to use?","confidence":0.6},{"answer":"Mock Service Worker (MSW) supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://mswjs.io","question":"What platforms does Mock Service Worker (MSW) support?","confidence":0.6},{"answer":"We have confirmed 8 integrations for Mock Service Worker (MSW), including Vitest, Playwright, Storybook, React Native, Express, fetch, axios and react-query. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://mswjs.io","question":"What does Mock Service Worker (MSW) integrate with?","confidence":0.6},{"answer":"Yes. Mock Service Worker (MSW) is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.","source":"https://github.com/mswjs/msw","question":"Is Mock Service Worker (MSW) open source?","confidence":0.95}]` |
| deployment.options | `{"cloud":true,"on_prem":true}` | - |
| description.long | An open source platform that creates mock APIs and performs contract testing across multiple API specification formats including OpenAPI, AsyncAPI, gRPC, GraphQL, and SOAP to accelerate API development and validation. | An open-source API mocking library that uses the Service Worker API to intercept network requests in browsers and Node.js, enabling developers to mock REST, GraphQL, and WebSocket APIs for testing and development without modifying application code. |
| features.capabilities | `{"deployment":"docker","open_source":true,"mocking_mode":"dynamic_templating","pricing_model":"open_source","market_segment":"dev-tool","openapi_import":true,"ci_cd_integration":true}` | `{"deployment":"embedded_library","open_source":true,"mocking_mode":"dynamic_templating","pricing_model":"open_source","market_segment":"dev-tool","openapi_import":true,"ci_cd_integration":true,"stateful_scenarios":true}` |
| integrations.count | 10 | 8 |
| integrations.list | `[{"name":"Postman"},{"name":"OpenAI"},{"name":"Keycloak"},{"name":"Backstage"},{"name":"Docker Desktop"},{"name":"OpenAPI"},{"name":"AsyncAPI"},{"name":"gRPC"},{"name":"GraphQL"},{"name":"SOAP"}]` | `[{"name":"Vitest"},{"name":"Playwright"},{"name":"Storybook"},{"name":"React Native"},{"name":"Express"},{"name":"fetch"},{"name":"axios"},{"name":"react-query"},{"name":"Hono","native":true},{"name":"Fastify","native":true}]` |
| language.primary | Java | TypeScript |
| license.spdx | Apache-2.0 | MIT |
| market.availability | - | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"web":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"open_source","sourceUrl":"https://microcks.io","retrievedAt":"2026-09-02T11:26:33.107Z"}` | `{"type":"open_source","summary":"Free and open source","freeTier":true,"sourceUrl":"https://mswjs.io","retrievedAt":"2026-10-14T21:33:51.343Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | open_source | open_source |
| pricing.price_level | free | free |
| pricing.transparent | - | yes |
| release.cadence_days | 43 | 2 |
| release.history | `[{"url":"https://github.com/microcks/microcks/releases/tag/1.15.0","date":"2026-08-05T07:48:13Z","type":"stable","version":"1.15.0"},{"url":"https://github.com/microcks/microcks/releases/tag/1.15.0-rc1","date":"2026-06-22T11:45:41Z","type":"stable","version":"1.15.0-rc1"},{"url":"https://github.com/microcks/microcks/releases/tag/1.14.0","date":"2026-04-29T08:15:31Z","type":"stable","version":"1.14.0"},{"url":"https://github.com/microcks/microcks/releases/tag/1.14.0-rc2","date":"2026-03-31T13:09:39Z","type":"stable","version":"1.14.0-rc2"},{"url":"https://github.com/microcks/microcks/releases/tag/1.14.0-rc1","date":"2026-03-27T14:21:30Z","type":"stable","version":"1.14.0-rc1"},{"url":"https://github.com/microcks/microcks/releases/tag/1.13.2","date":"2026-01-06T16:45:49Z","type":"stable","version":"1.13.2"},{"url":"https://github.com/microcks/microcks/releases/tag/1.13.1","date":"2025-12-08T15:51:55Z","type":"stable","version":"1.13.1"},{"url":"https://github.com/microcks/microcks/releases/tag/1.13.0","date":"2025-10-25T15:08:00Z","type":"stable","version":"1.13.0"},{"url":"https://github.com/microcks/microcks/releases/tag/1.12.1","date":"2025-07-21T12:44:11Z","type":"stable","version":"1.12.1"},{"url":"https://github.com/microcks/microcks/releases/tag/1.12.0","date":"2025-05-28T09:49:29Z","type":"stable","version":"1.12.0"},{"url":"https://github.com/microcks/microcks/releases/tag/1.11.2","date":"2025-03-25T15:24:45Z","type":"stable","version":"1.11.2"},{"url":"https://github.com/microcks/microcks/releases/tag/1.11.1","date":"2025-03-06T13:48:14Z","type":"stable","version":"1.11.1"},{"url":"https://github.com/microcks/microcks/releases/tag/1.11.0-fix-3","date":"2025-02-10T13:41:50Z","type":"stable","version":"1.11.0-fix-3"},{"url":"https://github.com/microcks/microcks/releases/tag/1.11.0-fix-2","date":"2025-02-10T09:50:00Z","type":"stable","version":"1.11.0-fix-2"},{"url":"https://github.com/microcks/microcks/releases/tag/1.11.0-fix-1","date":"2025-01-20T09:32:55Z","type":"stable","version":"1.11.0-fix-1"},{"url":"https://github.com/microcks/microcks/releases/tag/1.11.0","date":"2025-01-15T13:11:20Z","type":"stable","version":"1.11.0"},{"url":"https://github.com/microcks/microcks/releases/tag/1.10.1-fix-1","date":"2024-10-10T06:52:45Z","type":"stable","version":"1.10.1-fix-1"},{"url":"https://github.com/microcks/microcks/releases/tag/1.10.1","date":"2024-09-30T14:41:48Z","type":"stable","version":"1.10.1"},{"url":"https://github.com/microcks/microcks/releases/tag/1.10.0","date":"2024-08-02T09:34:39Z","type":"stable","version":"1.10.0"},{"url":"https://github.com/microcks/microcks/releases/tag/1.9.1-fix-1","date":"2024-06-13T15:10:09Z","type":"stable","version":"1.9.1-fix-1"}]` | `[{"url":"https://github.com/mswjs/msw/releases/tag/v3.0.3","date":"2026-10-10T01:37:25Z","type":"stable","version":"v3.0.3"},{"url":"https://github.com/mswjs/msw/releases/tag/v3.0.2","date":"2026-10-03T01:30:56Z","type":"stable","version":"v3.0.2"},{"url":"https://github.com/mswjs/msw/releases/tag/v3.0.1","date":"2026-09-30T12:36:57Z","type":"stable","version":"v3.0.1"},{"url":"https://github.com/mswjs/msw/releases/tag/v3.0.0","date":"2026-09-28T15:40:54Z","type":"stable","version":"v3.0.0"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.15.0","date":"2026-07-08T01:43:13Z","type":"stable","version":"v2.15.0"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.14.7","date":"2026-07-07T18:24:49Z","type":"stable","version":"v2.14.7"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.14.6","date":"2026-05-11T09:41:54Z","type":"stable","version":"v2.14.6"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.14.5","date":"2026-05-08T01:51:55Z","type":"stable","version":"v2.14.5"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.14.4","date":"2026-05-07T12:26:03Z","type":"stable","version":"v2.14.4"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.14.3","date":"2026-05-04T17:14:11Z","type":"stable","version":"v2.14.3"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.14.2","date":"2026-04-29T15:37:39Z","type":"stable","version":"v2.14.2"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.14.1","date":"2026-04-29T15:11:07Z","type":"stable","version":"v2.14.1"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.14.0","date":"2026-04-29T14:12:53Z","type":"stable","version":"v2.14.0"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.13.6","date":"2026-04-24T15:53:44Z","type":"stable","version":"v2.13.6"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.13.5","date":"2026-04-23T01:46:05Z","type":"stable","version":"v2.13.5"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.13.4","date":"2026-04-16T16:25:47Z","type":"stable","version":"v2.13.4"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.13.3","date":"2026-04-14T01:44:10Z","type":"stable","version":"v2.13.3"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.13.2","date":"2026-04-08T11:18:18Z","type":"stable","version":"v2.13.2"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.13.1","date":"2026-04-07T18:14:15Z","type":"stable","version":"v2.13.1"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.13.0","date":"2026-04-06T12:37:48Z","type":"stable","version":"v2.13.0"}]` |
| security.scorecard | 7.5 | 6.2 |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=io.github.microcks%3Amicrocks-model&per_page=100","last_12m":0,"max_severity":null}` | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=msw&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (API Mocking)

| Capability | Microcks | Mock Service Worker (MSW) |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Mocking mode | Dynamic templating | Dynamic templating |
| Stateful scenarios | - | ✓ |
| Fault chaos injection | - | - |
| Openapi import | ✓ | ✓ |
| Proxy passthrough | - | - |
| Admin API | - | - |
| Deployment | Docker | Embedded library |
| Legacy protocol virtualization | - | - |
| Collaboration sharing | - | - |
| Ci cd integration | ✓ | ✓ |
| Open source | ✓ | ✓ |
| Market segment | Dev tool | Dev tool |
| Pricing model | Open source | Open source |

*Source: vioscaleAI. Generated 2026-10-16T20:02:46.683Z. "-" = undocumented, not absent.*