Top Alternatives to ALTCHA in 2026
Top Self-Hosted & Software as a Service SaaS apps like ALTCHA
ALTCHA
ALTCHA uses a proof-of-work mechanism to protect your website, APIs, and online services from spam and unwanted content. Unlike other CAPTCHA solutions, ALTCHA is free, open-source and self-hosted, does not use cookies nor fingerprinting, does not track users, and is fully...
License
Free • Open SourcePlatforms
Self-Hosted,Software as a Service SaaS
6 alternatives found
Cloudflare Turnstile
★ 3.0Turnstile is Cloudflare's smart CAPTCHA alternative. It automatically chooses from a rotating suite of non-intrusive browser challenges based on telemetry and client behavior exhibited during a session.
Friendly Captcha
Friendly Captcha is a tool for preventing spam on your website.
mCaptcha
★ 2.3A no-nonsense CAPTCHA system with seamless UX | Backend component.
MTcaptcha
★ 2.5MTCaptcha is a smart captcha service that prioritizes privacy and accessibility. It offers an adaptive invisible noCaptcha that is easy for humans but hard for bots, making verification frictionless. MTCaptcha is GDPR and WCAG compliant, ensuring that your data is never sold or...
Procaptcha
Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy, security, and decentralization. It's a pioneering solution designed to offer an alternative to conventional, centralized CAPTCHA systems that often compromise user privacy.
Trustcaptcha
★ 1.3Trustcaptcha is your user-friendly CAPTCHA solution for preventing spam and bot attacks on your website with a focus on GDPR compliance and UX.