Best CAPTCHA Software for Drupal

MTCaptcha is a smart captcha service that prioritizes privacy and accessibility. It offers an adaptive invisible noCaptcha that is easy for humans but hard for bots, making verification frictionless. MTCaptcha is GDPR and WCAG compliant, ensuring that your data is never sold or shared with third parties. The captcha images are certified colorblind safe and the widget is fully VPAT compliant and optimized for screen readers. MTCaptcha supports any language and can be fully customized to match any webpage. It also supports audio in captcha, making it accessible to users who are visually impaired. MTCaptcha is trusted by Enterprises, Government, NGOs worldwide and is available in all the major world languages. MTCaptcha works around the world, including in China, making it a truly global captcha solution. It is backed by an adaptive Risk Engine that monitors and responds to threats, making it difficult for bots but easy for humans.

ALTCHA is a modern security and privacy-focused platform built to defend web services from bots and abuse — without compromising the user experience. At the heart of its ecosystem is ALTCHA Sentinel, a next-generation threat detection and mitigation system designed to protect websites, APIs, and applications from automated attacks, spam, and other forms of abuse. ALTCHA Sentinel stands out by combining adaptive machine learning, behavioral analysis, and smart verification techniques. It doesn’t rely on intrusive CAPTCHAs or outdated blocking tactics; instead, it works invisibly behind the scenes, analyzing traffic patterns in real time to identify and stop threats before they cause harm. Sentinel protects critical entry points like sign-up forms, login pages, and comment sections — all while keeping the experience seamless for real users.

Solve Media's CAPTCHA TYPE-IN™ ads are an easy plug-in solution that saves your users time while making your site more secure and more profitable. Instead of struggling with difficult puzzles, users quickly enter a simple brand message or security phrase. Help your users reach their destination quickly and easily, saving them an average of 7 seconds every time. Earn incremental revenue from previously un-monetized placements on a revenue share model. Behind our TYPE-IN™ ads is a sophisticated technology that protects your site from bots, spammers, and attackers. Our security advisory council is comprised of industry-leading experts who drive the technology that makes safe online advertising possible. CAPTCHA is a test to determine if an end user is a human or an automated bot. Did you know that bots account for 25% of web traffic? As a Solve Media partner, some of the industry's best security minds have you protected.

More than 50.000 sites worldwide use our protection. Improve your captcha in 5 minutes. We have captcha plugins for 19 popular content management systems such as Concrete5, phpBB, Simple Machines Forum, MediaWiki, PunBB, MyBB, Movable Type, DataLife Engine, Phorum, Woltlab BB, OpenCart, Pligg, and XOOPS.

When it comes to fraud, prevention is more cost-effective than cure. By deploying intuitive traffic testing, the CyberSiARA system provides a proactive approach to cyber-security that stops fraud in its tracks. The traffic classification capability differentiates between genuine users and potential attackers in real-time using interactive enforcement challenges – quickly halting both automated and human-driven attacks before a breach can be made. CyberSiARA uses powerful traffic analysis processes to determine user intent. By identifying fraud signifiers in traffic behavior, the system deploys interactive challenges to test activity classified as suspicious. This allows genuine users to enjoy a seamless access experience, while attacks from a broad range of origins are defeated. Traffic designed to overcome authentication challenges is stopped with innovative challenge strategies.