Best Self-Hosted reCAPTCHA Alternatives in 2026
reCAPTCHA is Google's bot detection service that protects websites from spam and abuse with risk analysis.
4 Self-Hosted Alternatives to reCAPTCHA
mCaptcha
2.4KMCaptcha lets you run privacy-focused proof-of-work CAPTCHA system entirely on your own server.
ALTCHA
2.1KALTCHA is a self-hosted security & authentication replacement for Cloudflare Turnstile, hCaptcha, and more.
Procaptcha
299Procaptcha lets you run blockchain-based CAPTCHA solution offering improved security entirely on your own server.
Private Captcha
157Private Captcha is a Go-based application that provides privacy-first CAPTCHA service.
Why Look for reCAPTCHA Alternatives?
reCAPTCHA is Google’s bot detection service that protects websites from spam and abuse with risk analysis.
Self-hosted alternatives give you full data ownership, predictable costs, and zero vendor lock-in. You run the software on your own infrastructure and control everything.
4 Best Open-Source Alternatives to reCAPTCHA
ALTCHA
ALTCHA offers cutting-edge spam and abuse protection for websites and apps, with privacy-friendly CAPTCHA alternatives designed for GDPR compliance. — 2,084 GitHub stars. Licensed under MIT.
mCaptcha
Privacy-focused proof-of-work CAPTCHA system that silently protects websites without tracking users or requiring image solving. Drop-in replacement for reCAPTCHA. — 2,423 GitHub stars. Licensed under AGPL-3.0.
Procaptcha
A blockchain-based CAPTCHA solution offering improved security, user experience, and resistance to bot attacks for web applications. — 299 GitHub stars. Licensed under Apache-2.0.
Private Captcha
Independent, privacy-first CAPTCHA service — 156 GitHub stars. Licensed under Custom.
Read full Private Captcha review
Why Self-Host Instead of reCAPTCHA?
- Data ownership. Your data stays on your server, not on reCAPTCHA’s infrastructure.
- Predictable costs. Pay a fixed VPS cost instead of growing per-user or per-usage fees.
- No vendor lock-in. Export and migrate your data anytime. You control the database.
- GDPR and compliance. Hosting your own tools simplifies data residency and compliance requirements.
Why teams switch from reCAPTCHA
- → Data ownership. Your data stays on your server -- not on reCAPTCHA's infrastructure.
- → Predictable costs. Pay a fixed VPS cost instead of growing per-user or per-usage fees.
- → No vendor lock-in. Export and migrate your data anytime. You control the database.
- → GDPR and compliance. Hosting your own tools simplifies data residency and compliance requirements.
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