capjs
Security
standalone@3.1.13
Cap is a privacy-focused CAPTCHA you run on your own infrastructure, aimed at developers who want bot protection on forms and logins without sending visitor…1mo agoDockerDemoEasy
Self-hosted alternatives to Google reCAPTCHA
Teams moving off Google reCAPTCHA can run the bot check on their own servers with the projects below. capjs replaces reCAPTCHA with invisible proof-of-work and browser instrumentation, with no puzzles and no trackers, and its widget is about 20 kB. More about Google reCAPTCHA
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3 projects· by score
Projects
Also in Security
Not listed as Google reCAPTCHA 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.
AnubisWeighs the soul of incoming HTTP requests to stop AI crawlers
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.
DatabunkerSecure Vault for Customer PII/PHI/PCI/KYC Records
GlobaLeaksGlobaLeaks is a free, open-source, self-hosted whistleblowing platform for secure anonymous reporting with Tor, HTTPS, 2FA, and regulatory compliance.
OTS - One Time SecretsOne-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser
About these Google reCAPTCHA alternatives
FCaptcha detects AI agents and bots using behavioral analysis and proof-of-work, and it is a drop-in replacement for Turnstile, reCAPTCHA and hCaptcha. PrivateCaptcha is a privacy-first service that uses proof-of-work to block bots without user friction. It is GDPR-compliant and made in the EU.
3 open-source, self-hosted alternatives to Google reCAPTCHA are listed here, ranked by popularity, maintenance and documentation.
- Highest rated
- capjs (8 199 GitHub stars, Other license, written in JavaScript), followed by FCaptcha and PrivateCaptcha
- Docker
- 3 of the top 3 ship an official Docker image
- Easiest to set up
- capjs
- Recently updated
- FCaptcha v1.46.1 on 2026-10-28
Google reCAPTCHA alternatives compared
| Project | License | Language | Stars | Docker | Setup | Latest release | Score |
|---|---|---|---|---|---|---|---|
| capjs | Other | JavaScript | 8 199 | Yes | Easy | standalone@3.1.13 | 72 |
| FCaptcha | MIT | JavaScript | 228 | Yes | Moderate | v1.46.1 | 50 |
| PrivateCaptcha | Other | Go | 199 | Yes | Advanced | v1.46.1 | 43 |