cap

Free, open-source and self-hosted CAPTCHA alternative to reCAPTCHA. Privacy-first and powered by proof-of-work and instrumentation challenges. (by tiagozip)

Cap Alternatives

Similar projects and alternatives to cap

  1. coronavirus

    132 cap VS coronavirus

    Folding@home COVID-19 efforts

  2. Puter.js

    Puter.js - The Backend for AI-Generated Apps. One-shot full-stack apps with your existing AI coding tool. Puter.js gives you Auth, Storage, DB, AI & more, with up to 90% fewer AI tokens than other backend platforms.

    Puter.js logo
  3. RandomX

    77 cap VS RandomX

    Proof of work algorithm based on random code execution

  4. pow-bot-deterrent

    3 cap VS pow-bot-deterrent

    A proof-of-work based bot deterrent. Lightweight, self-hosted and copyleft licensed.

  5. Private Captcha

    Independent, privacy-first, self-hostable PoW CAPTCHA service made in EU

  6. EasyCaptchaJS

    0 cap VS EasyCaptchaJS

    EasyCaptchaJS is a lightweight and user-friendly jQuery/JS library that simplifies the integration of Google reCAPTCHA API into web pages. With EasyCaptchaJS, developers can effortlessly add the security and anti-bot protection of reCAPTCHA to their web applications, enhancing their overall security and user experience.

  7. checkpoint

    Checkpoint is a tiny reverse proxy that attempts to block AI by serving a cryptographic challenge. (by vaxerski)

  8. Prowl-API

    1 cap VS Prowl-API

    Prowl is an API that allows you to send IP and in return obtain the reputation of the IP as well as indicators of attacks and indicators of compromise associated with the address. Lupovis monitors the web in real time and identifies malicious IP addresses for you.

  9. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    SaaSHub logo
  10. Highest-priest-GPT

    Highest priest GPT

  11. proof-of-work

    0 cap VS proof-of-work

    Proof of Work with SHA256 and Bloom filter (by indutny)

  12. FCaptcha

    1 cap VS FCaptcha

    Open-source, invisible CAPTCHA that detects AI agents, bots, and headless browsers via 40+ behavioral signals, device & TLS fingerprinting, and SHA-256 proof of work. Self-hosted and privacy-first.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better cap alternative or higher similarity.

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cap reviews and mentions

Posts with mentions or reviews of cap. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2025-05-30.

Stats

Basic cap repo stats
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7,466
9.4
9 days ago

Sponsored
Puter.js - The Backend for AI-Generated Apps
One-shot full-stack apps with your existing AI coding tool. Puter.js gives you Auth, Storage, DB, AI & more, with up to 90% fewer AI tokens than other backend platforms.
developer.puter.com

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