tiagozip/cap
Free, open-source and self-hosted CAPTCHA alternative to reCAPTCHA. Privacy-first and powered by proof-of-work and instrumentation challenges. observed · 2026-08-28
Health v2 · maintenance only
81/100
- Activity 97
- Release rhythm 82
- Longevity 42
Flags: no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 0.0
- age_days: 599
- days_rel: 42
- days_push: 19
- n_releases_24m: 121
Adoption not part of the score
7610 stars · 551 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
Cap is a lightweight, open-source, self-hosted CAPTCHA alternative to reCAPTCHA, hCaptcha, and Cloudflare Turnstile. It uses invisible proof-of-work (SHA-256 via WASM or time-lock challenges) plus instrumentation challenges to verify real browsers, with no tracking or visual puzzles.
Use cases
- replace reCAPTCHA with a self-hosted captcha
- stop bot signups and spam form submissions
- add anti-bot protection without visual puzzles
- self-host a privacy-first captcha for GDPR compliance
- protect login and comment forms from scrapers
- migrate from reCAPTCHA without rewriting verification code
- run an invisible captcha widget in the background
When to choose
- you need a self-hosted, privacy-compliant captcha with no third-party telemetry
- you want a tiny (~20kb) widget with zero dependencies
- you want reCAPTCHA siteverify API compatibility for easy migration
- you need accessibility-friendly protection without image puzzles
When to avoid
- you need advanced human-verification like behavioral analysis against sophisticated bot farms
- you cannot run your own server or Docker container
- you require a fully managed SaaS captcha service
Facets
library · maturity active
security middleware wasm self-hosted security web-development privacy self-hosted self-hosted browser cross-platform captcha proof-of-work anti-bot antispam anti-scraper recaptcha-alternative privacy-first invisible-captcha web-server docker nodejs
3 sources
- readme: https://github.com/tiagozip/cap · fetched 2026-08-28 · f6c36c6300f0
- homepage: https://trycap.dev · fetched 2026-08-29 · 8ab86ab9fca7
- site_page: https://trycap.dev/guide · fetched 2026-08-29 · c4a0fd25ca40
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| tiagozip/cap | main | 81 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem