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Head-to-head · API Mocking Tools

WireMock vs Mock Service Worker

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score WireMock #3 in API Mocking Tools 9.0/10 Free plan Free plan✓ 0 of 4 features Visit WireMock
Mock Service Worker #7 in API Mocking Tools 8.5/10 Free plan Free plan✓ 3 of 4 features Visit site

WireMock leads on 0 checks, Mock Service Worker on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreWireMock · 9.0/10
  • Free planboth
  • Most featuresMock Service Worker · 3 of 4

WireMock scores higher on our rubric for api mocking tools: 9.0 against 8.5 out of 10; our editors rank them #3 and #7.

WireMock is the better fit for teams needing mature collaborative mocking. Mock Service Worker is the better fit for frontend teams mocking across browser and Node.

  • WireMock fits best

    Teams needing mature collaborative mocking

  • Mock Service Worker fits best

    Frontend teams mocking across browser and Node

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature WireMock 9.0/10 Visit ↗ Mock Service Worker 8.5/10 Visit ↗
At a glance
Editor score 9.0 8.5
Ranking #3 in API Mocking Tools #7 in API Mocking Tools
Best for Teams needing mature collaborative mocking Frontend teams mocking across browser and Node
Pricing model Free plan + paid Free
Starting price — Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud
Platforms Web, Linux, Windows, macOS Web
Support Community, Docs, Email Community, Docs
Integrations 8 integrations 8 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features WireMock 0/4 · Mock Service Worker 3/4
Dynamic responses Not checked yet ✓ (best)
OpenAPI import Not checked yet ✓ (best)
Mock data generation Not checked yet Not checked yet
Local deployment Not checked yet ✓ (best)
Specs
Request matching Not checked yet Not checked yet
Supported protocols Not checked yet HTTP, REST, GraphQL, WebSocket, SSE
Our review
Pros
  • Imports OpenAPI and validates mock and live API traffic
  • Supports Git synchronization, recording, stateful responses, and templating
  • Offers hosted, local, CI/CD, Kubernetes, and self-managed deployment
  • Intercepts requests at the network level without changing request clients
  • Mocks HTTP, REST, GraphQL, WebSocket, and server-sent event scenarios
  • Reuses handlers across development, tests, Storybook, and demos
Cons
  • Free is limited to 1,000 mock API calls per month
  • Free supports one user and three running mock APIs
  • Enterprise pricing is quote-based
  • OpenAPI handler generation uses the companion @msw/source library
  • Teams must define and maintain request handlers for mocked behavior
  • Its primary environment focus is JavaScript, browser, and Node.js workflows
Our verdict

WireMock is an API simulation and mocking platform for developers, testers, and engineering teams. WireMock Cloud supports hosted mock APIs, OpenAPI and Swagger imports, traffic recording, contract validation, and collaboration on…

Read the review →

Mock Service Worker is an open-source JavaScript API mocking library for browser and Node.js applications. It intercepts outgoing requests at the network level and returns developer-defined responses without requiring changes to…

Read the review →
  1. WireMockAPI Mocking Tools 9.0Free plan
  2. Mock Service WorkerAPI Mocking Tools 8.5Free plan

Strengths and trade-offs

  • WireMock — where it wins

    • Imports OpenAPI and validates mock and live API traffic
    • Supports Git synchronization, recording, stateful responses, and templating
    • Offers hosted, local, CI/CD, Kubernetes, and self-managed deployment

    Where it doesn't

    • Free is limited to 1,000 mock API calls per month
    • Free supports one user and three running mock APIs
    • Enterprise pricing is quote-based

  • Mock Service Worker — where it wins

    • Intercepts requests at the network level without changing request clients
    • Mocks HTTP, REST, GraphQL, WebSocket, and server-sent event scenarios
    • Reuses handlers across development, tests, Storybook, and demos

    Where it doesn't

    • OpenAPI handler generation uses the companion @msw/source library
    • Teams must define and maintain request handlers for mocked behavior
    • Its primary environment focus is JavaScript, browser, and Node.js workflows
  • WireMock9.0/10 · Free plan

    A flexible mocking platform spanning hosted, local, CI/CD, Kubernetes, and self-managed use.

    Visit WireMockFull verdict →
  • Mock Service Worker8.5/10 · Free plan

    A flexible JavaScript mock layer for frontend development, testing, and demos.

    Visit siteFull verdict →

More comparisons

All API mocking tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update