# Self-hosted alternatives to Altcha

> 1 self-hostable, open-source alternative to Altcha, ranked by score.

- [PrivateCaptcha](https://selfhost.directory/project/privatecaptcha)

## Also in Security

Not listed as Altcha alternatives, but from the same category:

- [captcha](https://selfhost.directory/project/captcha): Prosopo Procaptcha is a self-hosted, open-source CAPTCHA replacing reCAPTCHA and hCaptcha with zero data collection and proof-of-work or slider puzzle challenges.
- [mCaptcha](https://selfhost.directory/project/mcaptcha): Self-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.
- [FCaptcha](https://selfhost.directory/project/fcaptcha): Self-hosted, open-source CAPTCHA detecting AI agents and bots with behavioral analysis and proof-of-work. Drop-in replacement for Turnstile, reCAPTCHA, hCaptcha.
- [capjs](https://selfhost.directory/project/capjs): Self-hosted, open-source CAPTCHA that replaces reCAPTCHA with invisible proof-of-work and browser instrumentation: no puzzles, no trackers, a ~20 kB widget.
- [Anubis](https://selfhost.directory/project/anubis): Weighs the soul of incoming HTTP requests to stop AI crawlers
- [Databunker Pro](https://selfhost.directory/project/databunker-pro): Databunker 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.

All 244 Security projects: https://selfhost.directory/security

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Source: https://selfhost.directory/alternative-to/altcha