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Philosophy

Most CAPTCHA systems today are built around surveillance: tracking users, fingerprinting browsers, and collecting data in exchange for access. Cap rejects that model.

Cap is designed around a few core ideas:

  • Privacy by default: no trackers, no third-party requests, no hidden profiling.
  • Simplicity over complexity: no image labeling, no click-the-fire-hydrant puzzles.
  • Speed matters: fast to render, fast to solve, fast to validate.
  • User-first: designed to be unintrusive and accessible, with invisible and floating modes.
  • Self-hostable, not centralized: you control the infra, tokens, and behavior.

By using proof-of-work instead of user behavior analysis, Cap shifts the burden from identity to computation. That means anyone can prove they're human without cookies, accounts, or friction.

Cap is what a CAPTCHA should've been all along: simple, honest, and yours.

Built in Europe 🇪🇺
Released under the Apache 2.0 License.