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Best On-Premises CAPTCHA Software of 2025

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Find and compare the best On-Premises CAPTCHA software in 2025

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Use the comparison tool below to compare the top On-Premises CAPTCHA software on the market. You can filter results by user reviews, pricing, features, platform, region, support options, integrations, and more.

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    ALTCHA Reviews

    ALTCHA

    BAU Software s.r.o.

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    See Software
    ALTCHA is a CAPTCHA alternative which uses a proof of work mechanism to protect websites and online services against spam. ALTCHA uses a mechanism of proof-of-work to protect your website, online services, and APIs from spam and unwanted material. Unlike other solutions ALTCHA is open-source, self-hosted and free. It does not require external services and does not use fingerprinting or cookies.
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