captcha
Privacy-first, GDPR-compliant Captcha that just works. Block bots, not people.
Protect your forms and APIs with CAPTCHA that doesn't get in the way of your users or your legal team.
Private Captcha is an independent, privacy-first, self-hostable Proof-of-Work CAPTCHA service made in EU.
Captcha solver extension for humans. Buster is a browser extension which helps you to solve difficult captchas by completing reCAPTCHA audio challenges using speech recognition. Challenges are solved by clicking on the extension button at the bottom of the reCAPTCHA widget.
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A configurable captcha solution, focusing on accessibility & simplicity whilst maintaining security.
Cap is a lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.
Asirra is a human interactive proof that asks users to identify photos of cats and dogs. It's powered by over three million photos from our unique partnership with Petfinder.com. Protect your web site with Asirra � free!
CAPTCHA is a way how to verify that web application user is human. Using of CAPTCHA is a need in many web applications. Today it is commonly used by types based on the recognition of alphanumeric characters. The problem is that these tests are becoming more and more complicated for people, but, on the other hand, they are becoming even easier for bots. Therefore, I decided to create a concept to be based on a completely different principle. The result of my endeavour was the 3D captcha technology.
mCaptcha is proof-of-work based captcha system that is privacy focused and fully automated. A no-nonsense CAPTCHA system with seamless UX.
mCaptcha is a privacy respecting, free CAPTCHA system with a kickass UX. Your users no longer have to interact with ridiculous image-based CAPTCHA system, wasting precious mental bandwidth. Instead, your computer will do the work for you, see for yourself!
GDPR Compliant Captcha and Bot Protection. Privacy-First Captcha and Bot Protection.
Secure your data and users with the privacy-first alternative to reCAPTCHA. ALTCHA eliminates tracking, cookies, and fingerprinting, delivering a robust, accessible, and globally compliant security without a single puzzle.
ALTCHA is a self-hosted, privacy-first security solution that protects your websites, APIs, and online services from spam and abuse through an innovative proof-of-work mechanism. Unlike traditional CAPTCHAs that depend on intrusive methods like cookies or fingerprinting, ALTCHA delivers robust protection while respecting user privacy.
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Confident CAPTCHA™ is an easy to use, clickable, picture CAPTCHA that stops spam and bots on websites by asking visitors to verify they are human by clicking on specific images.
CAPTCHA validation using math operations
Are you dead tired of all those lame captcha verifiers? Well,.. in a real 'eureka' moment we had the idea to create an alternative. 'Fartcha'. You hear a Fart and you just have to type down what you think you just heard. You can always use the spell fart feature. (Your fart entry needs to be matched for 60% to pass. (% can be changed))
To use custom template image I have to inherit image-based bot detector and override GetTemplateImage method. Within the method I am fetching an image from Google search results based on predefined search keyword. For example, I want to get images for the theme "Landscapes". I select keywords that match this theme: "forest", "mountains", "waterfall", "falls", "hills", "lake".
MotionCAPTCHA is a jQuery CAPTCHA plugin, based on the HTML5 Canvas Harmony procedural drawing tool by Mr Doob and the $1 Unistroke Gesture Regonizer algorithm (and the more recent Protractor algorithm improvement), requiring users to sketch the shape they see in the canvas in order to submit a form.
the modern spam protection
mosparo is the modern spam protection system for your forms. mosparo will catch the spam messages before they get sent to your inbox. It is usable by everybody – except robots – and is open source and free to use.
Professional free CAPTCHA for your site Even if you are Google
Stop more bots. Start protecting user privacy. The #1 privacy-first CAPTCHA for web, mobile, and more.