Best CAPTCHA Software with a Free Trial

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.

Organizations—from startups to large enterprises—use Friendly Captcha to protect their websites and online services from spam and abuse. Friendly Captcha respects your user’s privacy and works automatically, so your users don’t have to do anything. Based on the underlying mechanisms of the blockchain, Friendly Captcha employs a fundamentally new approach to securely defend your websites and online services from spam and bots. Friendly Captcha does not depend on tracking your users and exploiting personal data. Plus, your users no longer have to deal with tedious labeling tasks. They don’t have to do anything at all.

Online businesses rely on CaptchaFox to defend and safeguard their website and services against automated bot attacks. CaptchaFox protects against account takeover, credential stuffing, spam and scalping while complying with global privacy laws, such as GDPR, CCPA, and more. Through minimized data collection and retention during verification, the privacy of your users is always preserved. CaptchaFox utilizes a variety of data signals and dynamic response challenges to verify the authenticity of visitors without the use of cookies or trackers. The challenges have low friction and are easy for humans to solve but difficult for bots. The service is available in multiple languages and scales to incoming traffic through our global infrastructure. Enterprise customers can access advanced threat insights to achieve complete risk awareness.

Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy, security, and decentralization. It's a pioneering solution designed to offer an alternative to conventional, centralized CAPTCHA systems that often compromise user privacy. By choosing Prosopo Procaptcha, you're not only safeguarding your applications from bots and malicious actors but also upholding the privacy of your users.

The service identifies requests similar to automatic ones, identifies bots, and filters them out without loss of response speed. For analysis, we use ML models trained on datasets containing data on many years of experience in protecting Yandex web resources. The datasets are regularly updated. The service does not use ready-made images, but generates them independently, making it possible to maintain an 85% level of human recognition while making it difficult for bots to recognize the CAPTCHA. SmartCaptcha is deployed in the Yandex Cloud infrastructure, which complies with international standards and Russian information security laws. Add verification to your site without the “I’m not a robot” button. An invisible captcha will only be seen by users with suspicious-looking requests. The service generates texts for recognition independently, and you can choose their level of complexity.