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< h1 class = "mt-0" > Defend Like Castles< / h1 >
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< p class = "lead" > mCaptcha is proof-of-work based captcha system that is privacy focused and fully automated.< / p >
< a class = "btn btn-primary btn-lg px-4 mb-2" href = "https://demo.mcaptcha.org/" role = "button" > Try mCaptcha< / a >
& nbsp & nbsp & nbsp
< a class = "btn btn-primary btn-lg px-4 mb-2" href = "/docs/introduction/installing-captcha/" role = "button" > Get started< / a >
< p class = "meta" > Libre software < a href = "https://github.com/mCaptcha" > GitHub< / a > < / p >
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< h2 class = "h4" > Privacy focused< / h2 >
< p > Doesn't track, doesn't profile your users.< / p >
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< h2 class = "h4" > Robust and Accurate< / h2 >
< p > Got users behind < a href = "https://en.wikipedia.org/wiki/Network_address_translation" > NATs< / a > ? No issues. We don't use IP address for rate-liming. NAT or not you get the mCaptcha experience.
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< h2 class = "h4" > Best-in-class UX< / h2 >
< p > mCaptcha is silent, so silent that your users won't even feel it. No more annoying images, no more helping for Big Brothers with their ML stuff< / p >
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< h2 class = "h4" > Defend like castles< / h2 >
< p > Our < a href = "https://en.wikipedia.org/wiki/Proof_of_work" > PoW< / a > -based solution defends fierily. mCaptcha makes attacking your site more expensive than what it will take for you to respond to the attacker's requests< / p >
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< h2 class = "h4" > Libre Software< / h2 >
< p > Client libraries are licensed using proprietary-friendly free software licenses but the core is < a href = "http://www.gnu.org/licenses/agpl-3.0" > AGPL'd< / a > . We believe this is a tech that can change the way the web works so mCaptcha will always be free< / p >
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< h2 class = "h4" > xCaptcha drop-in replacement< / h2 >
< p > Already using a captcha solution? No worries, our APIs are compatible with reCAPTCHA and hCaptcha!< / p >
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< li class = "list-inline-item" > Powered by < a href = "https://gohugo.io/" > Hugo< / a > , and < a href = "https://getdoks.org/" > Doks< / a > < / li >
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