Private Captcha is described as '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' and is a Anti-Spam tool in the security & privacy category. There are more than 10 alternatives to Private Captcha for a variety of platforms, including Web-based, SaaS, Self-Hosted, Wordpress and JavaScript apps. The best Private Captcha alternative is Cap Captcha, which is both free and Open Source. Other great apps like Private Captcha are Anubis, reCAPTCHA, Procaptcha and ALTCHA.
Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.
Cap Captcha is the most popular Self-Hosted alternative to Private Captcha.
Cap Captcha is the most popular Open Source & free alternative to Private Captcha.
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.
reCAPTCHA is a free service that protects your site from spam and abuse, using risk analysis techniques to tell humans and bots apart.
reCAPTCHA is the most popular Web-based alternative to Private Captcha.
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.
Procaptcha is the most popular SaaS alternative to Private Captcha.
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.
A lightweight (~217 bytes vanila JS at frontend) and privacy-friendly plugin to prevent spam comment in the default commenting system of WordPress. Works instantly. No settings required. No captcha.
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.
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.
DataDome is the only bot protection solution delivered as-a-service. Unlike competing products, it requires no architecture changes or DNS rerouting, and will never be a single point of failure.
DataDome is the most popular Windows & Linux alternative to Private Captcha.
DataDome is the most popular commercial alternative to Private Captcha.
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.
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...
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