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FCaptcha

Open source invisible CAPTCHA that catches AI agents

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FCaptcha is a self-hosted, MIT-licensed CAPTCHA with no puzzle. One click or fully invisible. It catches headless browsers, Puppeteer, Playwright, Selenium, and the new wave of AI agents driving real browsers (vision click bots, computer-use agents). Verifies Web Bot Auth signed crawlers so polite agents get through. Drop-in for Turnstile, reCAPTCHA and hCaptcha: same siteverify contract. No cookies, no third-party data. WCAG 2.2 AA, false-positive budget enforced in CI. Go, Node or Python.

PH · launched Sep 22, 2026 · 2 upvotes (top 26%) · 3 views

Niche: ai agent security and monitoring tools · 297 launches, 14 in the last 7 days ▼ -44% · Explore this niche →

Category and tags
  • Security
  • Dev tools
  • Developer
  • Not AI
  • Hobby / open-source project
  • Open Source
  • Developer Tools
  • Security

Visit website ↗ Source listing ↗

More like this: all 297 launches in ai agent security and monitoring tools →

Could you build this?

Partial Serving challenge tokens and verification endpoints is straightforward, but developing effective behavioral and fingerprinting algorithms to accurately distinguish AI vision agents and headless browsers without false positives requires advanced anti-bot engineering.

What it would actually take: The client script needs deep browser fingerprinting (Canvas, WebGL, AudioContext, DOM-mutation timing, and event dispatch analysis) combined with a high-throughput backend analyzing mouse dynamics and Web Bot Auth cryptographic signatures. Keeping ahead of stealth browser automation libraries (like puppeteer-extra-stealth) requires ongoing security and reverse engineering research.

Competitors

Other products that read as similar to this one : 172 launches clear the similarity bar, closest 8 shown.

Attention rank: #56 of 173 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 306 days after the earliest competitor.

  • rea-captcha · ph · 2026-10-16 · 1 upvotes · similarity 0.54
  • Cap.Guru MCP · ph · 2026-11-12 · 1 upvotes · similarity 0.47
  • Google Browser Scraper · ph · 2026-10-07 · 1 upvotes · similarity 0.46
  • imnotarobot · github · 2026-10-19 · 50 upvotes · similarity 0.46
  • NoneCap · ph · 2026-11-01 · 1 upvotes · similarity 0.45
  • FireClaw · hn · 2026-03-17 · 5 upvotes · similarity 0.44
  • recaptcha-vm · github · 2026-11-02 · 27 upvotes · similarity 0.42
  • Agent-browser-shield · hn · 2026-06-03 · 7 upvotes · similarity 0.42

Related data

The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.