PrivateCaptcha
Security
v1.46.1
An independent CAPTCHA service built on Proof-of-Work cryptographic challenges that run silently in the background, replacing traditional puzzle-based CAPTCHAs.todayDockerAdvanced
Self-hosted alternatives to Altcha
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Also in Security
Not listed as Altcha alternatives, but they cover the same ground and are worth a look.
captchaProsopo Procaptcha is a self-hosted, open-source CAPTCHA replacing reCAPTCHA and hCaptcha with zero data collection and proof-of-work or slider puzzle challenges.
mCaptchaSelf-hosted, open-source CAPTCHA server where visitors' browsers do SHA256 proof-of-work instead of image puzzles; the Rust backend runs with Postgres and Redis.
FCaptchaSelf-hosted, open-source CAPTCHA detecting AI agents and bots with behavioral analysis and proof-of-work. Drop-in replacement for Turnstile, reCAPTCHA, hCaptcha.
capjsSelf-hosted, open-source CAPTCHA that replaces reCAPTCHA with invisible proof-of-work and browser instrumentation: no puzzles, no trackers, a ~20 kB widget.
AnubisWeighs the soul of incoming HTTP requests to stop AI crawlers
Databunker ProDatabunker is an open-source, self-hosted vault for tokenizing and encrypting personal records (PII, PHI, KYC) with a REST API, web UI, and GDPR compliance.
About these Altcha alternatives
1 open-source, self-hosted alternatives to Altcha are listed here, ranked by popularity, maintenance and documentation.
- Highest rated
- PrivateCaptcha (199 GitHub stars, Other license, written in Go)
- Docker
- 1 of the top 1 ship an official Docker image
- Recently updated
- PrivateCaptcha v1.46.1 on 2026-10-28
Altcha alternatives compared
| Project | License | Language | Stars | Docker | Setup | Latest release | Score |
|---|---|---|---|---|---|---|---|
| PrivateCaptcha | Other | Go | 199 | Yes | Advanced | v1.46.1 | 43 |