# capjs.js.org

> AI-optimized mirror of capjs.js.org containing 25 pages totalling 7,723 words of clean markdown content, structured data, and semantic HTML. Original source: https://capjs.js.org/. Last updated: 2026-05-01T18:39:44.954Z.

Each page is available as HTML (with JSON-LD structured data) and Markdown (text-only, ideal for LLMs and RAG).

## Homepage

- [Self-hosted CAPTCHA for the modern web.](/site-root.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (500 words)
- [Self-hosted CAPTCHA for the modern web.](/site-root.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (500 words)

## Articles & Blog Posts

- [Cap vs Cloudflare Turnstile](/guide/alternatives/turnstile-html.html): How Cap compares to Cloudflare Turnstile. A self-hosted, fully customizable, open-source alternative. (332 words)
- [Cap vs Altcha](/guide/alternatives/altcha-html.html): How Cap compares to Altcha. Both are open-source proof-of-work CAPTCHAs — here's where they differ. (391 words)
- [Cap vs hCaptcha](/guide/alternatives/hcaptcha-html.html): How Cap compares to hCaptcha. A self-hosted, puzzle-free, free-at-scale open-source alternative. (377 words)
- [Cap vs Anubis](/guide/alternatives/anubis-html.html): How Cap compares to Anubis, the proof-of-work scraper deterrent. When to use each. (339 words)
- [Cap vs reCAPTCHA](/guide/alternatives/recaptcha-html.html): How Cap compares to Google reCAPTCHA v2 and v3. A privacy-friendly, self-hosted, open-source alternative. (354 words)
- [Cap vs FriendlyCaptcha](/guide/alternatives/friendlycaptcha-html.html): How Cap compares to FriendlyCaptcha. A free, self-hosted, open-source proof-of-work alternative. (261 words)
- [guide/widget-html.html](/guide/widget-html.html) (1 words)
- [Alternatives to Cap](/guide/alternatives-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (560 words)
- [@cap.js/server](/guide/server-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (717 words)
- [Options](/guide/standalone/options-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (563 words)
- [guide-html.html](/guide-html.html) (1 words)
- [Cap Standalone](/guide/standalone/index-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (377 words)
- [Community libraries](/guide/community-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (257 words)
- [Instrumentation challenges](/guide/instrumentation-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (399 words)
- [Programmatic mode](/guide/programmatic-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (172 words)
- [API](/guide/standalone/api-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (111 words)
- [Effectiveness](/guide/effectiveness-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (224 words)
- [How does Cap work?](/guide/workings-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (253 words)
- [Benchmark](/guide/benchmark-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (67 words)
- [Floating mode](/guide/floating-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (117 words)
- [Quickstart](/guide/index.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (616 words)
- [M2M](/guide/solver-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (191 words)
- [Demo](/guide/demo-html.html): Cap is a lightweight, modern open-source CAPTCHA alternative using SHA-256 proof-of-work and instrumentation challenges (43 words)

## Resources

- [Full Page Index](/index.html): Browse all cached pages with rich metadata
- [About This Cache](/content/about.html): Methodology, technical details, and usage guidelines
- [XML Sitemap](/content/sitemap.xml): Machine-readable sitemap for crawler discovery
- [Robots.txt](/content/robots.txt): Crawler directives