Captcha

A captcha that uses images instead of garbled text

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

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.

Google reCaptcha helpers and verifier

Rack middleware Captcha verification using Recaptcha API.

Simple, easy captcha for Sinatra

A simple and fast image captcha generator that uses opencv and memcached.

Submit captcha images and retrieve the text as a string.

Ruby wrapper for Yandex.Cleanweb

Captcha generator for rails

Merb plugin that provides helpers for recaptcha.net service

Merb plugin that provides helpers for recaptcha.net service

Ruby gem to use the textcaptcha.com service

Captcha-Plugin for Rails

MVC based Math, Logic Captcha

RMagickCaptcha is a gem that implements captcha for using in Rails application.

A simple way to add zero friction captchas to Rails forms

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

This plugin adds helpers for the reCAPTCHA API - Forked for Rails 3

Captchator as Rack middleware, and helpers for sinatra.

Captcha library which uses imagemagick to create captchas

SimpleCaptcha is available to be used with Rails 3 or above and also it provides the backward compatibility with previous versions of Rails.

Simple lib to generate a math_captcha to prevent spammers in form. Supports localization.

Helpers for the reCAPTCHA API, updated by PRX to work with Ruby 1.8.7 and Rails 2.3

This gem facilitates interaction with https://rucaptcha.com/api-rucaptcha API.

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.

Rails mountable engine, that provides captcha support

This plugin adds helpers for the reCAPTCHA API

Russian Post tracking toolset, consisting tracking form bot (since Russian Post is too retarded for normal API) and captcha solver/recognizer.

This plugin adds helpers for the ReCAPTCHA API

Gem that uses RuCaptcha API to solver any type of captcha

Define questions and answers in a YAML file and validate your models with a single line of code. No more captchas or other stupid tricks.

LoyalSimpleCaptcha is available to be used with Rails 3 or above and also it provides the backward compatibility with previous versions of Rails.

Death by Captcha Ruby implementation (HTTP API)

Use Turnstile by Cloudflare to perform captcha validation in your Rails app

Simple captcha based on plain text questions.

这是一个验证码生成器。基于rucaptcha。本人只是将他的源码拉下来。为我的网站进行适配。因为我不使用sesion.id

Simple negative captcha for Rails

generate captcha by dalli,use the memcache

Gem to beat questions served up by the TextCaptcha service.

Helps humankind with simpler captchas

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

This plugin adds helpers for the reCAPTCHA API

Form protection with simple captcha calculations.

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.

A simple CAPTCHA implementation for Rails 5+ based on RMagick.

Simple Audio Extension to Simple Captcha

This is a Captcha gem for ruby. It drawing captcha image with C code so it no dependencies.

Antigate (Decode captcha service) wrapper for Ruby

Simple, easy way to implement recaptcha for Sinatra