The best free alternative to reCAPTCHA is Cap Captcha, which is also Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to reCAPTCHA and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to reCAPTCHA are Anubis, hCaptcha, Procaptcha and Cloudflare Turnstile.
Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.
Cap Captcha is the most popular Self-Hosted alternative to reCAPTCHA.
Cap Captcha is the most popular Open Source & free alternative to reCAPTCHA.
Applies sha256 proof-of-work challenges to incoming HTTP requests, targeting AI crawlers, bots that ignore robots.txt, and automated scrapers, protecting server resources and preventing unwanted search engine indexing for privacy-focused sites.
I put this on my company page and now my colleagues think I'm into furries
hCaptcha is designed to solve the most labor intensive problem in machine learning: labeling massive amounts of data in a timely, affordable, and reliable way.
hCaptcha say they have privacy based policies but its basically a "trust me bro" situation. Not GDPR friendly.
I like hCaptcha for his privacy respectful policies.
Most users think hCaptcha is a great reCAPTCHA alternative.
hCaptcha is the most popular Web-based alternative to reCAPTCHA.
Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy and security. It's a pioneering solution designed to offer an alternative to conventional CAPTCHA systems that often compromise user privacy.
It works better, it costs less, it doesn't track your users, it has invisible challenges for humans stops bots. Need I say more?
Almost everyone thinks Procaptcha is a great reCAPTCHA alternative.
Procaptcha is the most popular SaaS alternative to reCAPTCHA.
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.
Too easily bypassed these days unless you fork out $3000 per month for their enterprise product. Every man and his dog has written a Turnstile solver
ALTCHA is a privacy-first solution built to help developers and website owners stop bots, spam, and automated abuse — without making things harder for real users. It replaces traditional CAPTCHA systems with a smarter, quieter approach to verification and threat detection.
Its proof of work only - this is a delay mechanism only so I don't know why its in the "stop bots" category?
The most secure and privacy-aware solution on the market
It doesn't actually stop bots
Complete garbage - 200 EUR per month and puppeteer users botted it immediately
Some users think Friendly Captcha is a great reCAPTCHA alternative, some don't.
mosparo is the modern solution for protecting your online forms from spam. The protection method is quite simple: mosparo blocks spam using rules matching the form’s data. The detection method is comparable to an e-mail spam filter.
It is Free and Open Source. Inspectable.
Private Captcha is an independent, privacy-first, self-hostable Proof-of-Work CAPTCHA service made in EU. Instead of asking users to solve complex puzzles or track their behavior, Private Captcha solves an invisible cryptographic task in the background.
It's the only one that has solid backend code (frontend parts all have the same)
It has many pre-built integrations
GDPR-complisnt and self-hosted.
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...
TrustCaptcha is a privacy-first, invisible CAPTCHA that protects your website from bots and spam—without disrupting your users.
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I tried cap captcha on my site and the bots just kept on spamming me.