head to head · open source
mantis vs agent-manager
mantis has 2,764 GitHub stars, 236 forks, 1 open issues and last shipped yesterday. agent-manager has 690 stars, 78 forks, 58 open issues and last shipped yesterday. mantis leads on adoption by 301% (2,764 vs 690 stars). mantis is written in Python under Apache-2.0; agent-manager is written in Go under Apache-2.0. mantis has attracted 9% as many forks as stars, agent-manager 11%. mantis was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (ai-agents, code-review, gemini-cli), 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 | agent-manager | |
|---|---|---|
| GitHub stars | ★ 2.8K | ★ 690 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Go |
| Last push | 2026-11-12 | 2026-11-12 |
| Forks | ⑂ 236 | ⑂ 78 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick mantis if
- You weight community size — 2.8K 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 agent-manager if
- You want the agent-manager feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and agent-manager fits your workflow better
About mantis
Mantis: Portable Toolkit for Building Secure Software [!CAUTION] USE AT YOUR OWN RISK. BE EXTREMELY CAREFUL. This suite is designed to generate and execute autonomously generated code that may be unstable or perform unexpected actions. USE THIS ONLY IN ISOLATED, RESTRICTED ENVIRONMENTS. Never run this suite on a machine with access to production systems, sensitive data, or internal networks. [!IMPORTANT] RESPONSIBLE USE AI models are non deterministic and can hallucinate findings or generate incorrect patches. All findings must be manually verified by a security expert before being reported. Do not mass file…
read the full mantis overview →
About agent-manager
The fastest developer workflow for every AI coding agent. Claude Code, Codex, OpenCode, Grok, Gemini CLI, Pi, Command Code, and Hermes Agent run side by side. Each tool runs in its own persistent tmux session. agent manager is a thin layer over the CLIs you already have. Each session launches your own installed tool as is: your login, your subscription, your config files, your MCP servers, and every feature the tool ships all carry over, exactly as they behave in a plain terminal. Instead of hunting through terminal tabs to see which agent is done and which is stuck, every session shows up in one list with live…
read the full agent-manager overview →
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Frequently asked questions
Is mantis or agent-manager more popular?
mantis has 2,764 GitHub stars and agent-manager has 690. mantis has the larger community by that measure.
Are mantis and agent-manager free?
Both are open source. mantis is licensed under Apache-2.0 and agent-manager under Apache-2.0. Neither carries a licence fee.
What is the difference between mantis and agent-manager?
mantis is written in Python and agent-manager in Go. 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 agent-manager?
Choose mantis if you want the larger community (2,764 stars) or its Apache-2.0 licence terms. Choose agent-manager if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.