Cap Captcha AlternativesAnti-Spam Tools and other similar apps like Cap Captcha

Cap Captcha is described as 'Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work' and is a Anti-Spam tool in the security & privacy category. There are more than 25 alternatives to Cap Captcha for a variety of platforms, including Web-based, Self-Hosted, SaaS, Wordpress and JavaScript apps. The best Cap Captcha alternative is Anubis. It's not free, so if you're looking for a free alternative, you could try Anubis or reCAPTCHA. Other great apps like Cap Captcha are Private Captcha, ALTCHA, hCaptcha and Cloudflare Turnstile.

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Alternatives list

  1. Anubis icon

    Anubis

     15 likes
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    Applies sha256 proof-of-work challenges to incoming HTTP requests, targeting AI crawlers, bots that ignore robots.txt, and automated scrapers, protecting server resources and preventing unwanted search engine indexing for privacy-focused sites.

    47 Anubis alternatives

    Cost / License

    • Free Personal
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    • Go (Programming Language)
    • Docker
    Anubis screenshot 1
     

    • Anubis is the most popular Self-Hosted alternative to Cap Captcha.

    • Anubis is the most popular Open Source & free alternative to Cap Captcha.

    • Anubis is Free Personal and Open SourceCap Captcha is Free and Open Source
    • Anubis is Security-focusedCap Captcha is not according to our users
  2. reCAPTCHA icon

    reCAPTCHA

     127 likes
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    reCAPTCHA is a free service that protects your site from spam and abuse, using risk analysis techniques to tell humans and bots apart.

    28 reCAPTCHA alternatives

    Cost / License

    • Freemium (Subscription)
    • Proprietary

    Application type

    Platforms

    • Online
    reCAPTCHA screenshot 1
     

    • reCAPTCHA is the most popular Web-based alternative to Cap Captcha.

    • reCAPTCHA is Freemium and ProprietaryCap Captcha is Free and Open Source
  4. Procaptcha icon

    Procaptcha

     14 likes
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    Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy and security. It's a pioneering solution designed to offer an alternative to conventional CAPTCHA systems that often compromise user privacy.

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application type

    Platforms

    • Online
    • Software as a Service (SaaS)
    • Wordpress
    Procaptcha screenshot 1
     

    • Procaptcha is the most popular SaaS alternative to Cap Captcha.

    • Procaptcha is Freemium and Open SourceCap Captcha is Free and Open Source
  5. Private Captcha icon

    Private Captcha

     16 likes
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    Private Captcha is an independent, privacy-first, self-hostable Proof-of-Work CAPTCHA service made in EU. Instead of asking users to solve complex puzzles or track their behavior, Private Captcha solves an invisible cryptographic task in the background.

    Cost / License

    • Free Personal
    • Proprietary

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Docker
    Internal portal screenshot
     
  6. ALTCHA icon

    ALTCHA

     8 likes
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    ALTCHA is a privacy-first solution built to help developers and website owners stop bots, spam, and automated abuse — without making things harder for real users. It replaces traditional CAPTCHA systems with a smarter, quieter approach to verification and threat detection.

    18 ALTCHA alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    • Software as a Service (SaaS)
    ALTCHA Sentinel - Self-hosted spam protection for websites, apps, and services.
     
  7. hCaptcha icon

    hCaptcha

     12 likes
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    hCaptcha is designed to solve the most labor intensive problem in machine learning: labeling massive amounts of data in a timely, affordable, and reliable way.

    30 hCaptcha alternatives

    Cost / License

    • Freemium (Subscription)
    • Proprietary

    Application type

    Platforms

    • Online
    hCaptcha screenshot 1
     
  9. Cloudflare Turnstile icon

    Cloudflare Turnstile

     4 likes
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    Turnstile is Cloudflare's smart CAPTCHA alternative. It automatically chooses from a rotating suite of non-intrusive browser challenges based on telemetry and client behavior exhibited during a session.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Online
    • JavaScript
    • Software as a Service (SaaS)
     
  10. mCaptcha icon

    mCaptcha

     4 likes
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    A no-nonsense CAPTCHA system with seamless UX | Backend component.

    30 mCaptcha alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Software as a Service (SaaS)
    mCaptcha screenshot 1
     
  11. mosparo icon

    mosparo

     4 likes
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    mosparo is the modern solution for protecting your online forms from spam. The protection method is quite simple: mosparo blocks spam using rules matching the form’s data. The detection method is comparable to an e-mail spam filter.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Python
    • JavaScript
    • Drupal
    • Django
    • PHP
    • Mautic
    • Wordpress
    A screenshot from the software mosparo with the empty project list.
     
  12. Forget Spam Comment icon

    Forget Spam Comment

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    A lightweight (~217 bytes vanila JS at frontend) and privacy-friendly plugin to prevent spam comment in the default commenting system of WordPress. Works instantly. No settings required. No captcha.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    • Wordpress
    Forget Spam Comment screenshot 1
     
  13. Friendly Captcha icon

    Friendly Captcha

     10 likes
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    Friendly Captcha is a tool for preventing spam on your website.

    Cost / License

    • Freemium (Subscription)
    • Proprietary

    Application type

    Platforms

    • Online
    • Software as a Service (SaaS)
    Friendly Captcha screenshot 1
     
  14. TrustCaptcha icon

    TrustCaptcha

     2 likes
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    TrustCaptcha is a privacy-first, invisible CAPTCHA that protects your website from bots and spam—without disrupting your users.

    Cost / License

    • Freemium (Subscription)
    • Proprietary

    Application type

    Platforms

    • Online
    • Spring
    • Kotlin
    • Rust
    • Ruby
    • Python
    • .NET Framework
    • Craft CMS
    • React
    • Groovy
    • JavaScript
    • Angular
    • Software as a Service (SaaS)
    • Scala
    • PHP
    • Go (Programming Language)
    • Typescript
    • Java
    • Wordpress
    • Node.JS
    • Vue.js
    Contact Form Sample
     
12 of 31 Cap Captcha alternatives