A simple CAPTCHA system to block bots in Rails apps.

Tencent Cloud Ruby SDK is the official software development kit, which allows Ruby developers to write software that makes use of Tencent Cloud service CAPTCHA.

This gem provides integration with TrustCaptcha for Ruby applications, offering CAPTCHA verification with a focus on security and privacy.

TrustCaptcha – Privacy-first CAPTCHA solution for Ruby. GDPR-compliant, bot protection made in Europe.

A Ruby gem for integrating Friendly Captcha v2 into your applications. Friendly Captcha provides privacy-first, GDPR-compliant bot protection without tracking users or requiring them to solve puzzles.

Ruby package for easy integration with the API of solvecaptcha captcha solving service to bypass recaptcha, funcaptcha, geetest and solve any other captchas.

Rails extension for Cloudflare's Turnstile CAPTCHA alternative. This gem should work with Rails 6.x and 7.x, and with Faraday 1.x and 2.x.

Unity Captcha is a gem that use two levels of Captcha. First level is about Left Hemisphere: Logic and Math. Second level is about Right Hemisphere: Intuition and Drawing. This two levels functioning in complete harmony creates unity and this is the base design of this Captcha.

Antispam helps prevent spam in your Rails applications by checking against DNS blacklists and spam-prevention databases. It has two core features: (1) IP-based spam detection using Project Honey Pot to block known spammers automatically, and (2) content-based spam detection using Defendium’s machine learning API, which is free for up to 1,000 checks per day. Blacklist lookups are cached for 24 hours to minimize performance impact. The gem integrates seamlessly with Rails, allowing you to block spam at the request level and redirect flagged users to a captcha page.

Anti Captcha is an automated CAPTCHA solving service

Captcha Gem for Rails, which generates captcha image by Rust.

A Ruby gem that uses Tesseract OCR to extract text from UDISE captcha images. This gem helps in automating UDISE-related tasks by providing captcha reading capabilities.

ActsAsTextcaptcha provides spam protection for Rails models with text-based logic question captchas. Questions are fetched from Rob Tuley's textcaptcha.com They can be solved easily by humans but are tough for robots to crack.

reCAPTCHA was too much for us, so we created this. Simplest captcha ever.

Ruby package for easy integration with the API of 2captcha captcha solving service to bypass recaptcha, hcaptcha, funcaptcha, geetest and solve any other captchas.

TwoCaptcha allows you to solve captchas with manual labor

The idi_captcha_generator gem provides a customizable CAPTCHA solution tailored for high-traffic applications, ensuring that only legitimate users can access features like sign-up and login forms. By leveraging image-based questions, it prevents automated systems from bypassing security measures. This gem is particularly useful in environments where external services (like Google reCAPTCHA) cannot be used due to network restrictions. With simple implementation steps, you can integrate robust CAPTCHA functionality into your Rails application, enhancing its security without sacrificing user experience. Feel free to modify these texts to better fit your vision for the gem! If you need further assistance or adjustments, just let me know!

A Rails captcha gem that attempts to determine whether or not a user is human.

ALTCHA is a free, open-source CAPTCHA alternative that protects your website from spam and abuse

Google reCaptcha helpers and verifier