adds audio support to simple captcha

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

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

Simple reverse captcha solution that consist in create a hidden field that should be always empty.

ReCaptcha implements view helpers to generate ReCaptcha code, with the noscript counterpart, required methods that interface with the HTTP API for captcha verification, a DSL to generate a before_filter and the code to implement AJAX captcha validation.

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.

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

Captcha Client for YunPian.com

A simple CAPTCHA system to block bots in Rails apps.

EU captcha protects your website/API against abuse like form spam and credential stuffing

Captcha form Jike API

HumanDetector is a friendly logic captcha for Rails the doesn't require any external system dependency (e.g. external captcha API connections). It uses a simple question that any 7 or more years old human can understand, but that a spambot will not be able to answer. This Gem supports Ruby v1.9.2...

A simple image-based CAPTCHA engine for Rails 6+, works offline and supports Devise integration

generate captcha by dalli,use the memcache

Simple Audio Extension to Simple Captcha

Gem that uses RuCaptcha API to solver any type of captcha

A Ruby library for integrating Private Captcha verification into your applications

MVC based Math, Logic Captcha

A small Ruby/Rails friendly gem for verifying Alibaba Cloud intelligent captcha tokens through the VerifyIntelligentCaptcha OpenAPI.

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