# Mock Service Worker (MSW) vs Prism

**Leader by Vioscale score:** Prism

| Attribute | Mock Service Worker (MSW) | Prism |
|---|---|---|
| **Vioscale score** | 58.1 (81% (high)) | 76.7 (78% (high)) |
| adoption.dependent_repos | 11,851 | - |
| adoption.github_stars | 18,168 | - |
| deployment.options | - | `{"cloud":true,"self_hosted":true}` |
| description.long | 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. | A tool that generates mock HTTP servers from OpenAPI v2 and v3 documents, enabling frontend and backend teams to develop in parallel. It supports request and response validation, dynamic example generation, callbacks, and can function as a validation proxy to identify discrepancies between API documentation and implementation. |
| integrations.count | 8 | 6 |
| integrations.list | `[{"name":"Vitest"},{"name":"Playwright"},{"name":"Storybook"},{"name":"React Native"},{"name":"Express"},{"name":"fetch"},{"name":"axios"},{"name":"react-query"}]` | `[{"name":"GitHub"},{"name":"GitLab"},{"name":"Azure DevOps"},{"name":"Bitbucket"},{"name":"LDAP"},{"name":"SAML SSO"},{"name":"Google Analytics"}]` |
| language.primary | TypeScript | - |
| license.spdx | MIT | - |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"web":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://mswjs.io","retrievedAt":"2026-08-17T21:32:17.412Z"}` | `{"type":"hybrid","plans":[{"free":true,"name":"Free","summary":"Free, open-source","features":["API editor","OpenAPI/JSON schema visual designer","Code-based editing","Local mock servers","API console","Technical knowledge base","24x7 knowledge base access"],"minSeats":1,"components":[{"kind":"fixed","amount":0,"period":"month","currency":"USD"}],"description":"Open-source, self-hosted version","contactSales":false,"includedLimits":{"users":"1","projects":"1"}},{"free":false,"name":"Basic","summary":"$44/month (annually) or $56/month; includes 3 users, $11 per additional user","features":["OpenAPI/JSON schema visual designer","Interactive docs","Instant mock servers","Code-based editing","Schema reuse","Design validation","Git sync","OpenAPI export","Automatic mock servers","Request validation","Configurable response codes"],"minSeats":3,"commitment":"annual","components":[{"kind":"fixed","amount":44,"period":"month","currency":"USD"},{"kind":"per_unit","unit":"seat","amount":11,"period":"month","currency":"USD"}],"description":"Design an API as an individual","contactSales":false,"includedLimits":{"users":"3","projects":"Unlimited"}},{"free":false,"name":"Startup","summary":"$113/month (annually) or $147/month; includes 8 users, $11 per additional user","features":["All Basic features","Private projects","Multi-branch support","Custom domains, theming and favicon","Google Analytics integration","Approved email domains","Automatic changelogs","Dependency graph"],"minSeats":8,"commitment":"annual","components":[{"kind":"fixed","amount":113,"period":"month","currency":"USD"},{"kind":"per_unit","unit":"seat","amount":11,"period":"month","currency":"USD"}],"description":"Build an API program for small teams","contactSales":false,"includedLimits":{"users":"8","projects":"Unlimited"}},{"free":false,"name":"Pro Team","summary":"$362/month (annually) or $453/month; includes 15 users, $22 per additional user","features":["All Startup features","Shared style guides","Workspace groups","Remove Stoplight branding","Self-hosted Git providers","Activity logs","LDAP & SAML SSO","Component Libraries","User management and RBAC","Per-project user access","Workspace teams"],"minSeats":15,"commitment":"annual","components":[{"kind":"fixed","amount":362,"period":"month","currency":"USD"},{"kind":"per_unit","unit":"seat","amount":22,"period":"month","currency":"USD"}],"description":"Govern APIs across your organization","contactSales":false,"includedLimits":{"teams":"20","users":"15","projects":"Unlimited"}},{"free":false,"name":"Enterprise","summary":"Custom pricing","features":["All Pro Team features","Custom payment terms","Invoicing","Priority support"],"commitment":"annual","description":"Your API program at scale","contactSales":true,"includedLimits":{"teams":"Unlimited","users":"Unlimited","projects":"Unlimited"}}],"summary":"Free open-source version. Stoplight SaaS: from $44/month (Basic). Free 14-day trial.","currency":"USD","freeTier":true,"sourceUrl":"https://stoplight.io/pricing","retrievedAt":"2026-08-17T21:32:12.868Z","freeTrialDays":14,"startingPrice":{"amount":11,"period":"month","currency":"USD"},"billingPeriods":["month","year"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | freemium |
| pricing.price_level | free | low |
| pricing.transparent | - | yes |
| release.cadence_days | 2 | - |
| release.history | `[{"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"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.12.14","date":"2026-03-21T01:42:04Z","type":"stable","version":"v2.12.14"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.12.13","date":"2026-03-17T11:36:51Z","type":"stable","version":"v2.12.13"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.12.12","date":"2026-03-17T01:42:36Z","type":"stable","version":"v2.12.12"},{"url":"https://github.com/mswjs/msw/releases/tag/v2.12.11","date":"2026-03-15T19:07:45Z","type":"stable","version":"v2.12.11"}]` | - |
| security.gdpr | - | yes |
| security.scorecard | 6.2 | - |
| security.vulnerabilities | `{"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 | Mock Service Worker (MSW) | Prism |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Mocking mode | - | - |
| Stateful scenarios | - | - |
| Fault chaos injection | - | - |
| Openapi import | - | - |
| Proxy passthrough | - | - |
| Admin API | - | - |
| Deployment | - | - |
| Legacy protocol virtualization | - | - |
| Collaboration sharing | - | - |
| Ci cd integration | - | - |
| Open source | - | - |
| Market segment | - | - |
| Pricing model | - | - |

*Source: Vioscale. Generated 2026-09-01T17:25:15.549Z. "-" = undocumented, not absent.*