reCAPTCHA is a CAPTCHA system that enables web hosts to distinguish between human and automated access to websites. The latest version aims to have as little user interaction as possible, using machine learning to analyse a user's actions and determine if they are a bot, and...
- - reCAPTCHA is the most popular Web-based alternative to hCaptcha.
- - reCAPTCHA is the most popular free alternative to hCaptcha.
mosparo is the modern solution for protecting your online forms from spam. The protection method is quite simple: mosparo blocks spam using rules matching the form’s data. The detection method is comparable to an e-mail spam filter.
- - mosparo is the most popular Self-Hosted alternative to hCaptcha.
- - mosparo is the most popular Open Source alternative to hCaptcha.
A negative captcha has the exact same purpose as your run-of-the-mill image captcha: To keep bots from submitting forms. Image ("positive") captchas do this by implementing a step which only humans can do, but bots cannot: read jumbled characters from an image.
Negative Captcha FeaturesDiscontinued
The last update is from 2018.
Friendly Captcha is a tool for preventing spam on your website.
- - Friendly Captcha is the most popular SaaS alternative to hCaptcha.
Friendly Captcha Features
Turnstile is Cloudflare's smart CAPTCHA alternative. It automatically chooses from a rotating suite of non-intrusive browser challenges based on telemetry and client behavior exhibited during a session.
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 enter a simple brand message or security phrase.
- - Solve Media's CAPTCHA TYPE-IN™ is the most popular commercial alternative to hCaptcha.
Solve Media's CAPTCHA TYPE-IN™ Features
Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your Drupal, Wordpress and Joomla site or blog.Discontinued
"The Mollom content moderation service is no longer available … as of 2 April 2018."
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...
InputGuard is the privacy friendly alternative to reCAPTCHA or other captcha tools.