Skip to content

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 — no cookies, no accounts, no friction.

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

Released under the Apache 2.0 License.