Captcha proves you're human. HATCHA proves you're not

HATCHA

CAPTCHA proves you're human. HATCHA proves you're not.

HATCHA (Hyperfast Agent Test for Computational Heuristic Assessment) is a reverse CAPTCHA that gates access behind challenges trivial for AI agents but painful for humans — large-number multiplication, string reversal, binary decoding, and more.

Server-side verification — answers never reach the client. HMAC-signed tokens, stateless, no database required.

— answers never reach the client. HMAC-signed tokens, stateless, no database required. 5 built-in challenge types — math, string reversal, character counting, sorting, binary decode.

— math, string reversal, character counting, sorting, binary decode. Extensible — register custom challenge generators at runtime.

— register custom challenge generators at runtime. Themeable — dark, light, or auto mode via CSS custom properties.

— dark, light, or auto mode via CSS custom properties. Framework adapters — Next.js App Router and Express middleware out of the box.

Quickstart (Next.js)

1. Install

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