mCaptcha

A no-nonsense CAPTCHA system with seamless UX | Backend component.

2.3 on average

Cloudflare Turnstile

Turnstile 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.

3.0 on average

Procaptcha

Anti-Spam Tool

Bot Protection Service

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.

5 on average

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...

3 on average

Trustcaptcha

Anti-Spam Tool

Bot Protection Service

Trustcaptcha is your user-friendly CAPTCHA solution for preventing spam and bot attacks on your website with a focus on GDPR compliance and UX.

1.3 on average

InputGuard

InputGuard is the privacy friendly alternative to reCAPTCHA or other captcha tools.

1.6 on average

MTcaptcha

MTCaptcha 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...

2.5 on average