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
reCAPTCHA AlternativesTop Anti-Spam Tools and other similar apps like reCAPTCHA
reCAPTCHA is described as 'Free service that protects your site from spam and abuse, using risk analysis techniques to tell humans and bots apart' and is a very popular Anti-Spam tool in the security & privacy category. There are more than 25 alternatives to reCAPTCHA, not only websites but also apps for a variety of platforms, including SaaS, Self-Hosted, PHP and JavaScript apps. The best reCAPTCHA alternative is Cap Captcha, which is both free and Open Source. Other great sites and apps similar 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
32 hCaptcha alternativeshCaptcha 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 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
20 Cloudflare Turnstile alternativesTurnstile 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
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.
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
GeeTest protects your websites, mobile apps and APIs from bad bot attacks with zero user friction. Its self-learning defense model based on Graph Convolutional Networks and massive volumes of biometric data collected in the past 7 years allows GeeTest to identify and mitigate...
+3
The Arkose Labs platform undermines the economic drivers behind fraud until perpetrators are compelled to abandon attacks. Real-time risk classification of traffic with interactive enforcement challenges, the solution defeats automated attacks...
Cost / License
- Paid
- Proprietary
Platforms
- Software as a Service (SaaS)
Canada
United States
United Kingdom
Czechia
Germany
Switzerland
India
Estonia
China
I tried cap captcha on my site and the bots just kept on spamming me.