head to head · open source
mantis vs autoprompt-skill
mantis has 1,665 GitHub stars, 160 forks, 1 open issues and last shipped 2 days ago. autoprompt-skill has 1,170 stars, 72 forks, 1 open issues and last shipped yesterday. mantis leads on adoption by 42% (1,665 vs 1,170 stars). mantis is written in Python under Apache-2.0; autoprompt-skill is written in JavaScript under MIT. mantis has attracted 10% as many forks as stars, autoprompt-skill 6%. autoprompt-skill was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (ai-agents, code-review), so they are genuine substitutes rather than adjacent tools.
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
| mantis | autoprompt-skill | |
|---|---|---|
| GitHub stars | ★ 1.7K | ★ 1.2K |
| License | Apache-2.0 | MIT |
| Written in | Python | JavaScript |
| Last push | 2026-09-18 | 2026-09-19 |
| Forks | ⑂ 160 | ⑂ 72 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick mantis if
- You weight community size — 1.7K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick autoprompt-skill if
- You want the autoprompt-skill feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and autoprompt-skill fits your workflow better
About mantis
Mantis is a modular, stack agnostic toolkit of security review skills for AI coding agents, and it includes an ADK reference harness for building secure software. It lives in the developer tools, AI coding agent, and application security ecosystem, with topics such as code review, DevSecOps, multi agent systems, and hardware security. The project helps agents autonomously find, reproduce, and patch vulnerabilities while giving humans a structured way to review results.
read the full mantis overview →
About autoprompt-skill
Autoprompt is an MIT licensed coding agent skill for developers and teams working in agentic coding environments who want fewer failed runs, adding a review, fix, and recheck workflow to supported coding agents such as Claude Code, Codex, and OpenCode.
read the full autoprompt-skill overview →
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Frequently asked questions
Is mantis or autoprompt-skill more popular?
mantis has 1,665 GitHub stars and autoprompt-skill has 1,170. mantis has the larger community by that measure.
Are mantis and autoprompt-skill free?
Both are open source. mantis is licensed under Apache-2.0 and autoprompt-skill under MIT. Neither carries a licence fee.
What is the difference between mantis and autoprompt-skill?
mantis is written in Python and autoprompt-skill in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, mantis or autoprompt-skill?
Choose mantis if you want the larger community (1,665 stars) or its Apache-2.0 licence terms. Choose autoprompt-skill if its feature set, stack or MIT licence fits better. Both are self-hostable.