head to head · open source
SkillSpector vs coi
SkillSpector has 18,779 GitHub stars, 1,634 forks, 136 open issues and last shipped yesterday. coi has 732 stars, 64 forks, 29 open issues and last shipped yesterday. SkillSpector leads on adoption by 2,465% (18,779 vs 732 stars). SkillSpector is written in Python under Apache-2.0; coi is written in Go under MIT. SkillSpector has attracted 9% as many forks as stars, coi 9%. coi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (agentic-ai, claude-code), 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
| SkillSpector | coi | |
|---|---|---|
| GitHub stars | ★ 19K | ★ 732 |
| License | Apache-2.0 | MIT |
| Written in | Python | Go |
| Last push | 2026-09-30 | 2026-09-30 |
| Forks | ⑂ 1.6K | ⑂ 64 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick SkillSpector if
- You weight community size — 19K 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 coi if
- You want the coi feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Go
- You evaluated both and coi fits your workflow better
About SkillSpector
SkillSpector is an open source security scanner for AI agent skills that detects vulnerabilities, malicious patterns, prompt injection, data exfiltration, and supply chain risk in Claude Code, Codex CLI, Gemini CLI, and MCP skills before they are installed — built for developers who install agent skills and for security teams that vet or publish them.
read the full SkillSpector overview →
About coi
Coi (Code on Incus) is an MIT licensed Go tool that gives each AI coding agent its own isolated Incus system container — a full Linux machine with root, systemd, and Docker — for developers who want agents to work like they would on a real server without exposing the host or its credentials.
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Frequently asked questions
Is SkillSpector or coi more popular?
SkillSpector has 18,779 GitHub stars and coi has 732. SkillSpector has the larger community by that measure.
Are SkillSpector and coi free?
Both are open source. SkillSpector is licensed under Apache-2.0 and coi under MIT. Neither carries a licence fee.
What is the difference between SkillSpector and coi?
SkillSpector is written in Python and coi 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, SkillSpector or coi?
Choose SkillSpector if you want the larger community (18,779 stars) or its Apache-2.0 licence terms. Choose coi if its feature set, stack or MIT licence fits better. Both are self-hostable.