head to head · open source
SkillSpector vs api-relay-audit
SkillSpector has 17,624 GitHub stars, 1,504 forks, 136 open issues and last shipped yesterday. api-relay-audit has 839 stars, 80 forks, 26 open issues and last shipped 2 days ago. SkillSpector leads on adoption by 2,001% (17,624 vs 839 stars). SkillSpector is written in Python under Apache-2.0; api-relay-audit is written in Python under AGPL-3.0. SkillSpector has attracted 9% as many forks as stars, api-relay-audit 10%. SkillSpector was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai-security), 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 | api-relay-audit | |
|---|---|---|
| GitHub stars | ★ 18K | ★ 839 |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Python | Python |
| Last push | 2026-09-17 | 2026-09-16 |
| Forks | ⑂ 1.5K | ⑂ 80 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick SkillSpector if
- You weight community size — 18K 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 api-relay-audit if
- You want the api-relay-audit feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Python
- You evaluated both and api-relay-audit 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 api-relay-audit
API Relay Audit is an independent, local security audit tool for AI API relays, mirrors, gateways, and LLM proxies. It is written in Python, released under the AGPL 3.0 license, and lives in the AI security and privacy ecosystem alongside the OpenAI compatible and Anthropic compatible proxy tooling it is designed to examine. The project is informed by the paper Your Agent Is Mine , Anthropic's September 10, 2026 threat intelligence report on fraudulent Claude resellers, and a September 11 disclosure by co author Chaofan Shou regarding router data containing user credentials. It ships both as a standalone script a…
read the full api-relay-audit overview →
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Frequently asked questions
Is SkillSpector or api-relay-audit more popular?
SkillSpector has 17,624 GitHub stars and api-relay-audit has 839. SkillSpector has the larger community by that measure.
Are SkillSpector and api-relay-audit free?
Both are open source. SkillSpector is licensed under Apache-2.0 and api-relay-audit under AGPL-3.0. Neither carries a licence fee.
What is the difference between SkillSpector and api-relay-audit?
SkillSpector is written in Python and api-relay-audit 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, SkillSpector or api-relay-audit?
Choose SkillSpector if you want the larger community (17,624 stars) or its Apache-2.0 licence terms. Choose api-relay-audit if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.