head to head · open source
Anthropic-Cybersecurity-Skills vs nomore403
Anthropic-Cybersecurity-Skills has 35,453 GitHub stars, 4,318 forks, 48 open issues and last shipped 2 months ago. nomore403 has 1,915 stars, 223 forks, 2 open issues and last shipped 4 days ago. Anthropic-Cybersecurity-Skills leads on adoption by 1,751% (35,453 vs 1,915 stars). Anthropic-Cybersecurity-Skills is written in Python under Apache-2.0; nomore403 is written in Go under MIT. Anthropic-Cybersecurity-Skills has attracted 12% as many forks as stars, nomore403 12%. nomore403 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
| Anthropic-Cybersecurity-Skills | nomore403 | |
|---|---|---|
| GitHub stars | ★ 35K | ★ 1.9K |
| License | Apache-2.0 | MIT |
| Written in | Python | Go |
| Last push | 2026-08-31 | 2026-10-30 |
| Forks | ⑂ 4.3K | ⑂ 223 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Anthropic-Cybersecurity-Skills if
- You weight community size — 35K 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 nomore403 if
- You want the nomore403 feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Go
- You evaluated both and nomore403 fits your workflow better
About Anthropic-Cybersecurity-Skills
Anthropic Cybersecurity Skills The largest open source cybersecurity skills library for AI agents 818 production grade cybersecurity skills · 34 security domains · 6 framework mappings · 26+ AI platforms Get Started · What's Inside · Frameworks · Platforms · Contributing ⚠️ Community Project — This is an independent, community created project. Not affiliated with Anthropic PBC. 🔐 Authorized & lawful use only. This library includes offensive and dual use techniques (e.g. red team C2, phishing simulation, exploitation) intended for authorized penetration testing, security research, defense, and education . Only…
read the full Anthropic-Cybersecurity-Skills overview →
About nomore403
NoMore403 nomore403 is a command line tool for testing HTTP access control bypasses and parser inconsistencies around 401 , 403 , and related responses. The tool is designed for practical web security work: bug bounty, penetration testing, security reviews, and regression testing of access control rules. It automates a broad set of request mutations, captures a baseline, filters common false positives, and highlights the responses most likely to represent a meaningful bypass. What It Does Given a target URL, nomore403 : 1. Sends a baseline request to capture the blocked response. 2. Optionally auto calibrates…
read the full nomore403 overview →
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Frequently asked questions
Is Anthropic-Cybersecurity-Skills or nomore403 more popular?
Anthropic-Cybersecurity-Skills has 35,453 GitHub stars and nomore403 has 1,915. Anthropic-Cybersecurity-Skills has the larger community by that measure.
Are Anthropic-Cybersecurity-Skills and nomore403 free?
Both are open source. Anthropic-Cybersecurity-Skills is licensed under Apache-2.0 and nomore403 under MIT. Neither carries a licence fee.
What is the difference between Anthropic-Cybersecurity-Skills and nomore403?
Anthropic-Cybersecurity-Skills is written in Python and nomore403 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, Anthropic-Cybersecurity-Skills or nomore403?
Choose Anthropic-Cybersecurity-Skills if you want the larger community (35,453 stars) or its Apache-2.0 licence terms. Choose nomore403 if its feature set, stack or MIT licence fits better. Both are self-hostable.