13 stories tagged captcha, newest first.
8 points by MatthiasNordwig | 7 comments
WordPress.org plugin page for Invisible Anti-Spam & CAPTCHA, a free GDPR-friendly plugin that blocks form spam using invisible client-side proof-of-work instead of CAPTCHAs.
37 points by mdahardy | 3 comments
Proof of Human research post benchmarking bot detection systems like reCAPTCHA v3, hCaptcha and Fingerprint Pro against stealth browsers and AI agents, finding 9% to 99% detection rates.
57 points by theanonymousone | 55 comments
Terence Eden blog post (2017) arguing that CAPTCHAs rely on American cultural knowledge, using an anecdote about a US-centric IQ test question about coins.
759 points by HypnoticOcelot | 441 comments
Blog post complaining that Cloudflare Turnstile loops indefinitely in a WebKitGTK browser because it demands a WebGL device fingerprint.
599 points by ribtoks | 290 comments
A Private Captcha blog post arguing that Google Cloud Fraud Defense, the reCAPTCHA successor announced in May 2026, revives the device attestation of Web Environment Integrity.
402 points by meetpateltech | 201 comments
Neal.fun's "I'm Not a Robot," a browser game of increasingly absurd CAPTCHA-style levels, starting with a reCAPTCHA checkbox.
346 points by blakeashleyjr | 200 comments
A Tell HN post complaining that Cloudflare bot challenges block a Firefox-on-Linux VPN user from many sites, including Indeed, A2 Hosting, and Cloudflare's own forums.
1239 points by denysvitali | 264 comments
A playful CAPTCHA demo where users must play DOOM in the browser and kill at least three monsters, built with v0 and Vercel by @rauchg.
437 points by EndXA | 124 comments
A demo of Doom Captcha, a joke captcha widget where the user must kill four enemies in a Doom-style game to verify they are human.
338 points by vincent_s | 302 comments
arXiv paper presenting a user study of 1,400 participants solving 14,000 modern CAPTCHAs, evaluating solve times and user perceptions.
392 points by tomduncalf | 193 comments
A tweet showing Bing Chat refusing to read a captcha image, then transcribing it when the captcha is placed in a locket and framed as a deceased grandmother's love code.
619 points by Signez | 283 comments
A tweet sharing a TikTok video of HBO Max's new account-protection captcha puzzle, captioned as hilarious.
448 points by statquontrarian | 264 comments
A Tell HN post reporting that Cloudflare's human verification check loops endlessly on Firefox under Fedora Linux, with Chrome as the only workaround.