head to head · open source
SkillSpector vs ADR
SkillSpector has 17,624 GitHub stars, 1,504 forks, 136 open issues and last shipped yesterday. ADR has 1,570 stars, 148 forks, 6 open issues and last shipped 2 days ago. SkillSpector leads on adoption by 1,023% (17,624 vs 1,570 stars). SkillSpector is written in Python under Apache-2.0; ADR is written in Python under Apache-2.0. SkillSpector has attracted 9% as many forks as stars, ADR 9%. SkillSpector was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 5 topic tags (agent-security, ai-security, claude-code, mcp), 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 | ADR | |
|---|---|---|
| GitHub stars | ★ 18K | ★ 1.6K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-09-17 | 2026-09-16 |
| Forks | ⑂ 1.5K | ⑂ 148 |
| 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 ADR if
- You want the ADR 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 ADR 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 ADR
ADR is an open source enterprise security system for AI agents. It is built in Python under the Apache 2.0 license and lives in the AI security and privacy ecosystem. It targets employee facing coding agents such as Cursor, Claude Code, Codex, GitHub Copilot CLI, and DeepSeek Harness, and customer facing agents such as AI support agents.
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Frequently asked questions
Is SkillSpector or ADR more popular?
SkillSpector has 17,624 GitHub stars and ADR has 1,570. SkillSpector has the larger community by that measure.
Are SkillSpector and ADR free?
Both are open source. SkillSpector is licensed under Apache-2.0 and ADR under Apache-2.0. Neither carries a licence fee.
What is the difference between SkillSpector and ADR?
SkillSpector is written in Python and ADR 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 ADR?
Choose SkillSpector if you want the larger community (17,624 stars) or its Apache-2.0 licence terms. Choose ADR if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.