head to head · open source
SafeLine vs Mockoon
SafeLine has 23,154 GitHub stars, 1,592 forks, 69 open issues and last shipped 12 days ago. Mockoon has 8,468 stars, 483 forks, 31 open issues and last shipped 2 days ago. SafeLine leads on adoption by 173% (23,154 vs 8,468 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.
← all 20902 open source comparisons
Side by side
| SafeLine | Mockoon | |
|---|---|---|
| GitHub stars | ★ 23K | ★ 8.5K |
| License | GPL-3.0 | MIT |
| Written in | Go | TypeScript |
| Last push | 2026-10-22 | 2026-11-01 |
| Forks | ⑂ 1.6K | ⑂ 483 |
| 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 Make your web apps secure 🏠 Website 📖 Docs 🔍 Live Demo 🙋♂️ Discord 中文版 🏆 Achievements 👋 INTRODUCTION SafeLine is a self hosted WAF(Web Application Firewall) to protect your web apps from attacks and exploits. A web application firewall helps protect web apps by filtering and monitoring HTTP traffic between a web application and the Internet. It typically protects web apps from attacks such as SQL injection , XSS , code injection , os command injection , CRLF injection , ldap injection , xpath injection , RCE , XXE , SSRF , path traversal , backdoor , bruteforce , http flood , bot abused , among…
read the full SafeLine overview →
About Mockoon
Mockoon: awesome API mocking Mockoon is the easiest and quickest way to design and run mock APIs. No remote deployment, no account required, free and open source. It combines a desktop application to design and run mock servers locally, and a CLI to self host your fake APIs. A cloud is also available to collaborate with your team, keep your data in sync, and deploy your mock APIs. API mocking helps you speed up development and third party API integration by reducing dependency on external services and their limitations: rate limits, costs, availability, etc. It also allows you to test your applications in a…
read the full Mockoon overview →
More in Developer Tools
Related comparisons
More API Development & Testing projects
Compare either of these against the rest of the API Development & Testing field.
Frequently asked questions
Is SafeLine or Mockoon more popular?
SafeLine has 23,154 GitHub stars and Mockoon has 8,468. 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 (23,154 stars) or its GPL-3.0 licence terms. Choose Mockoon if its feature set, stack or MIT licence fits better. Both are self-hostable.