Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.
Portugal
EU
Cap Captcha vs reCAPTCHA Comments
- Cap Captcha is Free and Open Source
- Cap Captcha is Customizable, Lightweight and Privacy focused
Free reCAPTCHA AlternativesTop Anti-Spam Tools and other similar apps like reCAPTCHA
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.
Alternatives list
49 Anubis alternativesApplies 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.
Cost / License
- Free Personal
- Open Source (MIT)
Application type
Platforms
- Self-Hosted
- Go (Programming Language)
- Docker
Anubis vs reCAPTCHA Comments
Jesus DeboussierI put this on my company page and now my colleagues think I'm into furries
- Anubis is Free Personal and Open Source
- Anubis is Lightweight and Security-focused
hCaptcha vs reCAPTCHA Comments
Peter JepefhCaptcha 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.
- hCaptcha is Freemium and Proprietary
- hCaptcha is Privacy focused
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.
Cost / License
- Freemium
- Open Source (Apache-2.0)
Application type
Platforms
- Online
- Software as a Service (SaaS)
- Wordpress
+3
Procaptcha vs reCAPTCHA Comments
Peter JepefIt works better, it costs less, it doesn't track your users, it has invisible challenges for humans stops bots. Need I say more?
- Procaptcha is Freemium and Open Source
- Procaptcha is Privacy focused
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.
Cost / License
- Free
- Proprietary
Platforms
- Online
- JavaScript
- Software as a Service (SaaS)
Cloudflare Turnstile vs reCAPTCHA Comments
Jesus DeboussierToo 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
- Cloudflare Turnstile is Free and Proprietary
20 ALTCHA alternativesALTCHA 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.
ALTCHA vs reCAPTCHA Comments
Jesus DeboussierIts proof of work only - this is a delay mechanism only so I don't know why its in the "stop bots" category?
- ALTCHA is Free and Open Source
- ALTCHA is Privacy focused, Security-focused and Lightweight
Cost / License
- Freemium
- Proprietary
Application type
Platforms
- Online
- Software as a Service (SaaS)
Friendly Captcha vs reCAPTCHA Comments
Top Positive CommentThe most secure and privacy-aware solution on the market
Top Negative CommentPeter JepefIt doesn't actually stop bots
Jesus DeboussierComplete garbage - 200 EUR per month and puppeteer users botted it immediately
- Friendly Captcha is Freemium and Proprietary
- Friendly Captcha is Privacy focused
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.
+9
mCaptcha vs reCAPTCHA Comments
BiepIt is Free and Open Source. Inspectable.
- mCaptcha is Free and Open Source
- mCaptcha is Privacy focused
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.
+1
Private Captcha vs reCAPTCHA Comments
It's the only one that has solid backend code (frontend parts all have the same)
It has many pre-built integrations
bogatyrjovGDPR-complisnt and self-hosted.
- Private Captcha is Free Personal and Proprietary
- Private Captcha is Privacy focused and Lightweight
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...
Cost / License
- Freemium
- Proprietary
Platforms
- Software as a Service (SaaS)
+2
TrustCaptcha is a privacy-first, invisible CAPTCHA that protects your website from bots and spam—without disrupting your users.
Cost / License
- Freemium
- Proprietary
Application type
Platforms
- Online
- Spring
- Kotlin
- Rust
- Ruby
- Python
- .NET Framework
- Craft CMS
- React
- Groovy
- JavaScript
- Angular
- Software as a Service (SaaS)
- Scala
- PHP
- Go (Programming Language)
- Typescript
- Java
- Wordpress
- Node.JS
- Vue.js
+4
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I tried cap captcha on my site and the bots just kept on spamming me.