Cap

Lightweight proof-of-work CAPTCHA using SHA-256, 250x smaller than hCaptcha, with zero telemetry.

Servicefreeglobal

A lightweight, open-source CAPTCHA that uses SHA-256 proof-of-work to block bots while avoiding image puzzles and user tracking. It targets web developers and privacy-conscious teams that need compact, self-hostable bot protection, offering a solution much smaller than comparable CAPTCHA services with zero telemetry. It is not intended for sites that require third-party fraud risk scoring.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of Cap - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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