Ruby wrapper for Yandex.Cleanweb

A library to make creating negative captchas less painful

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

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

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

Google reCaptcha helpers and verifier

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.

This library can help you create a captcha in your terminal application, which may be damaged by a large influx of requests.

Gem that uses RuCaptcha API to solver any type of captcha

A simple way to add zero friction captchas to Rails forms

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

Form protection with simple captcha calculations.

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

Anti Captcha is an automated CAPTCHA solving service

Easy to use classical captcha for Rails apps

A captcha solver (only for easy ones) gem

A smart captcha library

wxianfeng_simple_captcha is captcha for rails,modified from simple_captcha .

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