A smart captcha library

AntiCaptcha api ruby wrapper

dongsx

A simple way to add zero friction captchas to Rails forms

Integrate the AreYouAHuman.com CAPTCHA alternative human verification into your Ruby/Rails application

Captcha generator for rails

Drop in feedback engine with customizable fields, and captcha available

A captcha verification approach for Rails apps, directly integrated into ActiveRecord’s validation mechanism and providing helpers for ActionController and ActionView.

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

It's a Rails Captcha Engine for Rails 3 applications.

Google reCaptcha helpers and verifier

Ruby wrapper for Yandex.Cleanweb

SimpleCaptcha is the simplest and a robust captcha. Its implementation requires adding up a single line in views and in controllers/models. SimpleCaptcha is available to be used with Rails2.0 or above and also it provides the backward compatibility with previous versions of Rails.

Form protection with simple captcha calculations.

jQuery slide captcha system with jQuery & jQuery UI for Rails 3

A Google-style captcha for enterprise Rails apps

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.

Antigate (Decode captcha service) wrapper for Ruby

Implementation of captcha (Completely Automated Public Turing-Test to Tell Computers and Humans Apart) that is both easy to use and easy to customize/extend.

Death by Captcha Ruby implementation (HTTP API)