vioscale
Comparison

Mock Service Worker (MSW) vs Prism

On the evidence we track, Prism leads this comparison with a composite score of 77/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Mock Service Worker (MSW) full profile →Prism full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
Mock Service Worker (MSW)58
★Prism77
Score
Vioscale score
Mock Service Worker (MSW)58 / 100high · 81%
Prism77 / 100high · 78%
Pricing
Free tier
Mock Service Worker (MSW)✓
Prism✓
Model
Mock Service Worker (MSW)commercial
Prismfreemium
Price level
Mock Service Worker (MSW)free
Prismlow
Transparent
Mock Service Worker (MSW)–
Prism✓
Integrations
Count
Mock Service Worker (MSW)8
Prism6
Security
Gdpr
Mock Service Worker (MSW)–
Prism✓
Scorecard
Mock Service Worker (MSW)6.2
Prism–
Vulnerabilities
Adoption
Dependent repos
Mock Service Worker (MSW)11,851
Prism–
Github stars
Mock Service Worker (MSW)18,168
Prism–
Release
Cadence days
Mock Service Worker (MSW)2
Prism–
History
Mock Service Worker (MSW)20 items
Prism–
License
Spdx
Mock Service Worker (MSW)MIT
Prism–
Language
Primary
Mock Service Worker (MSW)TypeScript
Prism–
Market
Availability
Mock Service Worker (MSW)Available worldwide
PrismAvailable worldwide

Capabilities

Feature-by-feature on the axes that matter for api mocking. “-” means undocumented, not absent.

Capabilities
Mocking mode
Mock Service Worker (MSW)-
Prism-
Stateful scenarios
Mock Service Worker (MSW)-
Prism-
Fault chaos injection
Mock Service Worker (MSW)-
Prism-
Openapi import
Mock Service Worker (MSW)-
Prism-
Proxy passthrough
Mock Service Worker (MSW)-
Prism-
Admin API
Mock Service Worker (MSW)-
Prism-
Deployment
Mock Service Worker (MSW)-
Prism-
Legacy protocol virtualization
Mock Service Worker (MSW)-
Prism-
Collaboration sharing
Mock Service Worker (MSW)-
Prism-
Ci cd integration
Mock Service Worker (MSW)-
Prism-
Open source
Mock Service Worker (MSW)-
Prism-
Market segment
Mock Service Worker (MSW)-
Prism-
Pricing model
Mock Service Worker (MSW)-
Prism-

What each one is

The product in its own terms, so the numbers below have context.

Mock Service Worker (MSW)

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.

Independently observed

Prism

Leader

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.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Mock Service Worker (MSW)

Open sourceFree tier
as of verify ↗

Prism

Leader
from $11/moHybridFree tier14-day trial

Free open-source version. Stoplight SaaS: from $44/month (Basic). Free 14-day trial.

  • FreeFree
    • API editor
    • OpenAPI/JSON schema visual designer
    • Code-based editing
    • Local mock servers
    • API console
    • +2 more
  • Basic$44/month (annually) or $56/month; includes 3 users, $11 per additional user
    • OpenAPI/JSON schema visual designer
    • Interactive docs
    • Instant mock servers
    • Code-based editing
    • Schema reuse
    • +6 more
  • Startup$113/month (annually) or $147/month; includes 8 users, $11 per additional user
    • All Basic features
    • Private projects
    • Multi-branch support
    • Custom domains, theming and favicon
    • Google Analytics integration
    • +3 more
  • Pro Team$362/month (annually) or $453/month; includes 15 users, $22 per additional user
    • All Startup features
    • Shared style guides
    • Workspace groups
    • Remove Stoplight branding
    • Self-hosted Git providers
    • +6 more
  • EnterpriseContact sales
    • All Pro Team features
    • Custom payment terms
    • Invoicing
    • Priority support
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Mock Service Worker (MSW)✓
Prism✓
CLI
Mock Service Worker (MSW)✓
Prism✓
Deployment
Cloud / SaaS
Mock Service Worker (MSW)–
Prism✓
Self-hosted
Mock Service Worker (MSW)–
Prism✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

Mock Service Worker (MSW)

8 total
  • Vitest
  • Playwright
  • Storybook
  • React Native
  • Express
  • fetch
  • axios
  • react-query
Independently observed

Prism

Leader
7 total
  • GitHub
  • GitLab
  • Azure DevOps
  • Bitbucket
  • LDAP
  • SAML SSO
  • Google Analytics
Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.