Comparison

Mock Service Worker (MSW) vs Mockoon

No clear leader: Mockoon (65.1) and Mock Service Worker (MSW) (60.5) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Mock Service Worker (MSW) full profile →Mockoon full profile →

Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.

Mock Service Worker (MSW)61

Mockoon65

Attribute comparison across 2 tools
Attribute	Mock Service Worker (MSW)	Mockoon
vioscaleAI score	61 / 100high · 79%	65 / 100medium · 72%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	open_source	freemium
Price levelpricing.price_level	free	low
Transparentpricing.transparent	✓	✗
Integrations
Countintegrations.count	8	8
Security
Disclosure policysecurity.disclosure_policy	-	✓
Scorecardsecurity.scorecard	6.2	-
Trust centersecurity.trust_center	-	https://mockoon.com/blog/security-update-vulnerability-patched-v9-2-0/
Vulnerabilitiessecurity.vulnerabilities	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=msw&per_page=100 · Last 12m: 0	-
Reliability
Sla pctreliability.sla_pct	-	99.9
Status pagereliability.status_page	-	✓
Adoption
Dependent reposadoption.dependent_repos	11,851	-
Github starsadoption.github_stars	18,290	-
Activity
Commits last 30dactivity.commits_last_30d	15	-
Release
Cadence daysrelease.cadence_days	2	-
Historyrelease.history	20 items	-
License
Spdxlicense.spdx	MIT	-
Language
Primarylanguage.primary	TypeScript	-
Market
Availabilitymarket.availability	Available worldwide	Available worldwide · Popular in US, EU
Content
Faqcontent.faq	5 items	6 items

Score

vioscaleAI score

Mock Service Worker (MSW)61 / 100high · 79%

Mockoon65 / 100medium · 72%

Pricing

Free tier

Mock Service Worker (MSW)✓

Mockoon✓

Model

Mock Service Worker (MSW)open_source

Mockoonfreemium

Price level

Mock Service Worker (MSW)free

Mockoonlow

Transparent

Mock Service Worker (MSW)✓

Mockoon✗

Integrations

Count

Mock Service Worker (MSW)8

Mockoon8

Security

Disclosure policy

Mock Service Worker (MSW)–

Mockoon✓

Scorecard

Mock Service Worker (MSW)6.2

Mockoon–

Trust center

Mock Service Worker (MSW)–

Mockoonhttps://mockoon.com/blog/security-update-vulnerability-patched-v9-2-0/

Vulnerabilities

Mock Service Worker (MSW)Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=msw&per_page=100 · Last 12m: 0

Mockoon–

Reliability

Sla pct

Mock Service Worker (MSW)–

Mockoon99.9

Status page

Mock Service Worker (MSW)–

Mockoon✓

Adoption

Dependent repos

Mock Service Worker (MSW)11,851

Mockoon–

Github stars

Mock Service Worker (MSW)18,290

Mockoon–

Activity

Commits last 30d

Mock Service Worker (MSW)15

Mockoon–

Release

Cadence days

Mock Service Worker (MSW)2

Mockoon–

History

Mock Service Worker (MSW)20 items

Mockoon–

License

Spdx

Mock Service Worker (MSW)MIT

Mockoon–

Language

Primary

Mock Service Worker (MSW)TypeScript

Mockoon–

Market

Availability

Mock Service Worker (MSW)Available worldwide

MockoonAvailable worldwide · Popular in US, EU

Content

Faq

Mock Service Worker (MSW)5 items

Mockoon6 items

Capabilities

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

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

Capabilities

Mocking mode

Mock Service Worker (MSW)Dynamic templating

MockoonDynamic templating

Stateful scenarios

Mock Service Worker (MSW)✓

Mockoon-

Fault chaos injection

Mock Service Worker (MSW)-

Mockoon-

Openapi import

Mock Service Worker (MSW)✓

Mockoon✓

Proxy passthrough

Mock Service Worker (MSW)-

Mockoon✓

Admin API

Mock Service Worker (MSW)-

Mockoon-

Deployment

Mock Service Worker (MSW)Embedded library

Mockoon-

Legacy protocol virtualization

Mock Service Worker (MSW)-

Mockoon-

Collaboration sharing

Mock Service Worker (MSW)-

Mockoon✓

Ci cd integration

Mock Service Worker (MSW)✓

Mockoon✓

Open source

Mock Service Worker (MSW)✓

Mockoon✓

Market segment

Mock Service Worker (MSW)Dev tool

MockoonDev tool

Pricing model

Mock Service Worker (MSW)Open source

MockoonFreemium

What each one is

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

Mock Service Worker (MSW)

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.

Independently observed

Mockoon

Mockoon provides a desktop application, CLI, and cloud service for creating and running mock REST APIs. It features request templating, OpenAPI support, HTTP proxying, and team collaboration capabilities for accelerated API development.

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

Free and open source

as of 2026-10-14verify ↗

Mockoon

from $100/moHybridFree tier14-day trial

Free open-source desktop and CLI. Team plan from $100/month (annual). Enterprise with custom pricing.

Team$100/month billed annually (saves 30% vs monthly)
- All open-source features (unlimited mocking, CLI, OpenAPI support, webhooks, serverless compatibility)
- Cloud deployment and hosting
- Web application access
- Real-time team collaboration
- Cloud data synchronization across devices
- +5 more
EnterpriseContact sales
- All Team plan features
- Custom quotas and limits
- Optional dedicated instances
- Custom cloud region selection
- Enterprise-grade support with custom SLA
- +3 more

as of 2026-08-18verify ↗

Platform & deployment

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

Platform and deployment support comparison
Supports	Mock Service Worker (MSW)	Mockoon
WebPlatforms	✓	✗
macOSPlatforms	✗	✓
WindowsPlatforms	✗	✓
LinuxPlatforms	✗	✓
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	-	✓
Self-hostedDeployment	-	✓

Platforms

Web

Mock Service Worker (MSW)✓

Mockoon✗

macOS

Mock Service Worker (MSW)✗

Mockoon✓

Windows

Mock Service Worker (MSW)✗

Mockoon✓

Linux

Mock Service Worker (MSW)✗

Mockoon✓

CLI

Mock Service Worker (MSW)✓

Mockoon✓

Deployment

Cloud / SaaS

Mock Service Worker (MSW)–

Mockoon✓

Self-hosted

Mock Service Worker (MSW)–

Mockoon✓

Integrations

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

Mock Service Worker (MSW)

10 total

Vitest
Playwright
Storybook
React Native
Express
fetch
axios
react-query
Hono
Fastify

Independently observed

Mockoon

8 total

OpenAPI
AWS Lambda
Google Cloud Functions
Firebase Functions
GitHub Actions
CircleCI
Travis CI
Docker

Independently observed

Still deciding?

Mock Service Worker (MSW) or Mockoon: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

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