Mockoon alternative: Mockfly vs Mockoon
Mockoon is one of the best free tools to mock an API on your own machine. The question most teams end up asking is what happens when the mock has to leave that machine: a teammate, a mobile app, a QA environment. That is where the two tools, and their prices, diverge.
What Mockoon does well
Mockoon is an open-source desktop application (with a CLI and a Docker image) for designing mock APIs locally. It has a polished interface, response rules, Faker-powered templating, a proxy mode, CRUD routes backed by data buckets, and OpenAPI import and export. Because it runs locally there are no request limits, no latency and no account, and it works on a plane.
Its limit is structural: the mock lives in a file on one computer. To share it you commit JSON to a repo and everyone runs their own copy, or you pay for Mockoon Cloud, which adds real-time collaboration, a web UI and cloud deployments with quotas on calls and deployed mocks.
What changes with Mockfly
- Hosted by default. Every project has a URL under
api.mockfly.devfrom the first endpoint. iOS, Android, another service or a tester's Postman can call it. No deploy step, no quota on deployed mocks. - Unlimited requests on Pro and Team. There is no monthly call counter to watch. The free plan is 500 requests a day.
- One place to edit. Changes are live for everyone immediately, with request logs, body history and auto-generated documentation on the same page.
- Import more than OpenAPI. Postman collections and HAR captures from your browser become endpoints too, and the Chrome extension turns real requests into mocks in one click.
- Scriptable and offline when needed. Public REST API and MCP server for CI and coding agents; the offline CLI serves the project from localhost.
Where Mockoon is the better choice
- You work alone or only need mocks in local development and tests, and want zero cost forever.
- You need stateful CRUD with persisted data buckets during a session.
- Your security policy forbids sending mock definitions to a SaaS.
Pricing
| Plan | Mockfly | Mockoon |
|---|---|---|
| Free | Starter: 500 requests/day, 1 project, 4 endpoints, 2 responses each | Desktop app and CLI: free, unlimited, local only |
| Individual | Pro: 15€/month or 150€/year, unlimited everything | No cloud plan for one user at the time of writing |
| Team | 49€/month for 5 seats, 9€ per extra seat, unlimited requests | Mockoon Cloud Team: $100/month, 5 members, 3 cloud deployments, 100,000 calls/month |
| Company | From 199€/month, setup done for you, custom seats and SLA | Enterprise: custom quotas and dedicated instances |
Third-party prices as listed on the vendor's website in September 2026. Check their pricing page for the current figures.
Features comparison
| Feature | Mockfly | Mockoon |
|---|---|---|
| Hosted URL without deploying | ✅ | Cloud plan only |
| Works offline | ✅ Offline CLI | ✅ Native |
| Real-time team editing | ✅ | Cloud plan only |
| Response rules | ✅ 16 comparators, AND/OR groups | ✅ |
| Faker.js data | ✅ | ✅ |
| AI-generated JSON | ✅ | Cloud plan only |
| OpenAPI import | ✅ | ✅ |
| Postman and HAR import, Chrome extension | ✅ | ❌ |
| Proxy to the real API | ✅ Per endpoint | ✅ |
| Stateful CRUD with data buckets | ❌ | ✅ |
| Request logs, body history, auto documentation | ✅ | Logs only |
| WebSocket mocking | ✅ | ❌ |
| File responses (PDF, CSV) | ✅ | ✅ |
Try it with a real endpoint: create a free project at app.mockfly.dev or import the OpenAPI export of your Mockoon environment.
Frequently asked questions
Is Mockoon free?
The Mockoon desktop app and CLI are free and open source, with no limits on routes or requests because everything runs on your machine. Sharing and deploying mocks online requires Mockoon Cloud, a paid subscription.
How much does Mockoon Cloud cost compared to Mockfly Team?
At the time of writing Mockoon Cloud lists a Team plan at $100 a month for 5 team members, 3 cloud deployments and 100,000 monthly calls. Mockfly Team is 49€ a month for 5 seats, unlimited projects and unlimited requests, plus 9€ per extra seat.
Can I import my Mockoon environment into Mockfly?
Export the environment from Mockoon as OpenAPI and import that file into Mockfly: every route becomes an endpoint with its responses. Rules and Faker templates need to be recreated because the two tools use different syntaxes.
Can I work offline with Mockfly like with Mockoon?
Yes. The mockfly-cli npm package pulls your projects once and serves them from localhost with the same rules, Faker templating and placeholders as production. You edit in the web app and pull again.