head to head · open source
Coder vs mantis
Coder has 15,676 GitHub stars, 1,525 forks, 996 open issues and last shipped today. mantis has 1,665 stars, 160 forks, 1 open issues and last shipped 2 days ago. Coder leads on adoption by 842% (15,676 vs 1,665 stars). Coder is written in Go under AGPL-3.0; mantis is written in Python under Apache-2.0. Coder has attracted 10% as many forks as stars, mantis 10%. Coder 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
| Coder | mantis | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 1.7K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Go | Python |
| Last push | 2026-09-20 | 2026-09-18 |
| Forks | ⑂ 1.5K | ⑂ 160 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Coder if
- You weight community size — 16K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick mantis if
- You want the mantis feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and mantis fits your workflow better
About Coder
Coder is a self hosted platform for cloud development environments and AI coding agents. It is written in Go, released under AGPL 3.0, and listed under Developer Tools / Version Control & Collaboration. Teams define workspaces with Terraform, connect through a secure Wireguard tunnel, and run environments on EC2 VMs, Kubernetes Pods, or Docker Containers.
read the full Coder overview →
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 →
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Frequently asked questions
Is Coder or mantis more popular?
Coder has 15,676 GitHub stars and mantis has 1,665. Coder has the larger community by that measure.
Are Coder and mantis free?
Both are open source. Coder is licensed under AGPL-3.0 and mantis under Apache-2.0. Neither carries a licence fee.
What is the difference between Coder and mantis?
Coder is written in Go and mantis in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Coder or mantis?
Choose Coder if you want the larger community (15,676 stars) or its AGPL-3.0 licence terms. Choose mantis if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.