altcha-org/altcha
GDPR, WCAG 2.2 AA, and EAA compliant, self-hosted CAPTCHA alternative with PoW mechanism. observed · 2026-08-28
Health v2 · maintenance only
93/100
- Activity 98
- Release rhythm 98
- Longevity 72
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: 8
- age_days: 1019
- days_rel: 14
- days_push: 14
- n_releases_24m: 42
Adoption not part of the score
2708 stars · 133 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
ALTCHA is an open-source, privacy-first CAPTCHA alternative that protects websites, forms, and APIs from bots and spam using a proof-of-work mechanism instead of cookies, tracking, or fingerprinting. It ships as a lightweight JavaScript widget with server-side verification libraries, and is GDPR, HIPAA, and WCAG 2.2 AA compliant while being fully self-hostable.
Use cases
- stop spam submissions on contact forms
- replace reCAPTCHA with a GDPR-compliant alternative
- block fake sign-ups and bot registrations
- add accessible bot protection for visually impaired users
- self-host CAPTCHA without third-party tracking
- protect login forms from automated abuse
- add proof-of-work verification to APIs
When to choose
- you need privacy-compliant (GDPR/HIPAA/CCPA) bot protection with no cookies or fingerprinting
- accessibility compliance (WCAG 2.2 AA, EAA) is required
- you want self-hosted protection with full data sovereignty
- you want a frictionless, invisible challenge for most users
- you need a lightweight widget with framework starters for React, Vue, Svelte, Angular, and more
When to avoid
- you need advanced adaptive bot detection with machine learning and threat intelligence without building it yourself (consider the commercial Sentinel/Cloud offerings)
- your threat model requires image-based CAPTCHA puzzles or human interaction challenges
- you cannot run a server-side challenge generation and verification endpoint and prefer a fully managed free service
Facets
library · maturity active
security middleware ui-components http-server security web-development privacy self-hosted browser self-hosted captcha-alternative proof-of-work anti-bot anti-spam gdpr-compliant wcag-accessible widget svelte ddos-protection web-server nodejs docker
10 sources
- readme: https://github.com/altcha-org/altcha · fetched 2026-08-28 · 962dbac0a48b
- homepage: https://altcha.org · fetched 2026-08-29 · bd52244014a2
- site_page: https://altcha.org/docs · fetched 2026-08-29 · 5bcc855dca2f
- site_page: https://altcha.org/sentinel-api-docs-v1.html · fetched 2026-08-29 · e7eddc80d4b0
- site_page: https://altcha.org/docs/integration/quick-start · fetched 2026-08-29 · 766b00b4db06
- site_page: https://altcha.org/docs/trust · fetched 2026-08-29 · 309c07f8ebc0
- site_page: https://altcha.org/docs/cloud · fetched 2026-08-29 · b03961b72e3d
- site_page: https://altcha.org/docs/sentinel · fetched 2026-08-29 · b327764ce107
- site_page: https://altcha.org/docs/sentinel/install · fetched 2026-08-29 · 308cf6aa0c3a
- registry_npm: https://registry.npmjs.org/altcha · fetched 2026-08-29 · ce80dd569157
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| altcha-org/altcha | main | 93 |
For agents
markdown · JSON · MCP: product_card(name="altcha-org/altcha")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem