Procaptcha – Open-source, privacy preserving and frictionless CAPTCHA
We built Procaptcha to make sure there's an actually good alternative to Google's ReCAPTCHA that's not a complete nightmare for the end user. Crucially we're not just a giant ad network like almost all CAPTCHA providers [1]. Like with other CAPTCHA providers it's simple to set up, you just change a couple of tags [2]. We've got a few different CAPTCHA types at the moment, all running on a distributed network of nodes with no user tracking. [1] https://prosopo.io/articles/stop-giving-your-website-data-aw... [2] https://github.com/prosopo/captcha
Procaptcha – Open-source, privacy preserving and frictionless CAPTCHA launched on March 19, 2024 with 8 votes, #1,754 of 4,270 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 2 years on.
What it does
Establish trust on every request. Welcome real users and AI agents, stop abusive bots — GDPR-compliant, risk-based verification that minimises friction.
Real users, AI agents and bad bots all hit your site differently. Prosopo establishes trust on every request — legitimate humans pass invisibly, trusted agents are recognised, and abusive automation stops at the door. Switch from reCAPTCHA in minutes. Score the intent of every request — human, AI agent or bot — and apply verification only when risk thresholds are exceeded. Our advanced risk scoring evaluates behaviour in real time to deliver adaptive protection that minimises friction for legitimate traffic. Designed to minimise data collection and avoid cross-site tracking. Our privacy-first solution ensures GDPR compliance and protects user privacy without compromising security. Policy…from prosopo.io
Does a similar job
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Replace CAPTCHAs with WebAuthn passkeys for bot prevention2024 · github.com · ▲71I built Nocaptcha after getting frustrated with traditional CAPTCHAs both as a user and developer. WebAuthn passkeys offered a promising alternative that's both more secure and user-friendly. What makes Nocaptcha different: - Uses WebAuthn standard instead of puzzle-solving - No need for users to remember passwords or solve puzzles - Open source Current limitation: Working with W3C WebAuthn Community Group on true passkey disposal for this use case. Looking for feedback particularly on: 1. Integration experience 2. User experience compared to traditional CAPTCHAs
CodeCaptcha - Hide web links behind coding challenges2022 · codecaptcha.io · ▲163Hello HN, I made this silly project over the long weekend. It’s pretty basic right now and the captchas are very easy. I plan to add captcha difficulty levels for link creators soon.
No CAPTCHA reCAPTCHA2014 · cloud.google.com · ▲181Google's update to CAPTCHA just asks if you're robot
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