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

Private Captcha is described as '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' and is a Anti-Spam tool in the security & privacy category. There are more than 10 alternatives to Private Captcha for a variety of platforms, including Web-based, SaaS, Self-Hosted, Wordpress and JavaScript apps. The best Private Captcha alternative is Cap Captcha, which is both free and Open Source. Other great apps like Private Captcha are Anubis, reCAPTCHA, Procaptcha and ALTCHA.

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Alternatives list

  1. Cap Captcha icon
     25 likes
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    Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

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

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

    • Cap Captcha is Free and Open SourcePrivate Captcha is Free Personal and Proprietary
    • Cap Captcha is CustomizablePrivate Captcha is not according to our users
  2. Anubis icon
     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
     
  3. reCAPTCHA icon
     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 is the most popular Web-based alternative to Private Captcha.

    • reCAPTCHA is Freemium and ProprietaryPrivate Captcha is Free Personal and Proprietary
  4. Procaptcha icon
     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 is the most popular SaaS alternative to Private Captcha.

    • Procaptcha is Freemium and Open SourcePrivate Captcha is Free Personal and Proprietary
  5. ALTCHA icon
     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)
     
  6. Copy a direct link to this comment to your clipboard

    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
     
  7. hCaptcha icon
     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
     
  8. Copy a direct link to this comment to your clipboard

    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)
     
  9. DataDome icon
     1 like
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    DataDome is the only bot protection solution delivered as-a-service. Unlike competing products, it requires no architecture changes or DNS rerouting, and will never be a single point of failure.

    Cost / License

    • Subscription
    • Proprietary

    Application type

    Platforms

    • Windows
    • Linux
    • Software as a Service (SaaS)
     
    • DataDome is the most popular Windows & Linux alternative to Private Captcha.

    • DataDome is the most popular commercial alternative to Private Captcha.

    • DataDome is Paid and ProprietaryPrivate Captcha is Free Personal and Proprietary
  10. mCaptcha icon
     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)
     
  11. mosparo icon
     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
     
  12. Copy a direct link to this comment to your clipboard

    The Arkose Labs platform undermines the economic drivers behind fraud until perpetrators are compelled to abandon attacks. Real-time risk classification of traffic with interactive enforcement challenges, the solution defeats automated attacks...

    Cost / License

    • Subscription
    • Proprietary

    Platforms

    • Software as a Service (SaaS)
     
12 of 19 Private Captcha alternatives