head to head · open source
SafeLine vs Mockoon
SafeLine has 22,606 GitHub stars, 1,533 forks, 69 open issues and last shipped 8 days ago. Mockoon has 8,411 stars, 477 forks, 31 open issues and last shipped 2 days ago. SafeLine leads on adoption by 169% (22,606 vs 8,411 stars). SafeLine is written in Go under GPL-3.0; Mockoon is written in TypeScript under MIT. SafeLine has attracted 7% as many forks as stars, Mockoon 6%. Mockoon was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| SafeLine | Mockoon | |
|---|---|---|
| GitHub stars | ★ 23K | ★ 8.4K |
| License | GPL-3.0 | MIT |
| Written in | Go | TypeScript |
| Last push | 2026-09-10 | 2026-09-16 |
| Forks | ⑂ 1.5K | ⑂ 477 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick SafeLine if
- You weight community size — 23K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick Mockoon if
- You want the Mockoon feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and Mockoon fits your workflow better
About SafeLine
SafeLine is a self hosted web application firewall and reverse proxy, written in Go and licensed under GPL 3.0, that filters, monitors, and blocks malicious HTTP/S traffic before it reaches a web application — built for developers, AppSec engineers, and blue teams who want to run edge protection on their own infrastructure.
read the full SafeLine overview →
About Mockoon
Mockoon is an open source API mocking tool written in TypeScript and released under the MIT license. It ships as a desktop application built with Electron for designing and running mock servers locally, alongside a command line interface and a serverless package for running the same mock APIs in headless and cloud function environments. The project lives in the JavaScript and TypeScript ecosystem, distributed through NPM as @mockoon/cli and @mockoon/serverless , and through native package managers on each desktop platform. No remote deployment and no account are required to run it.
read the full Mockoon overview →
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Frequently asked questions
Is SafeLine or Mockoon more popular?
SafeLine has 22,606 GitHub stars and Mockoon has 8,411. SafeLine has the larger community by that measure.
Are SafeLine and Mockoon free?
Both are open source. SafeLine is licensed under GPL-3.0 and Mockoon under MIT. Neither carries a licence fee.
What is the difference between SafeLine and Mockoon?
SafeLine is written in Go and Mockoon in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, SafeLine or Mockoon?
Choose SafeLine if you want the larger community (22,606 stars) or its GPL-3.0 licence terms. Choose Mockoon if its feature set, stack or MIT licence fits better. Both are self-hostable.