Awesome Captcha

Curated list of awesome captcha libraries and captcha crack tools.

CAPTCHA is a type of challenge–response test used in computing to determine whether or not the user is human.

English | 中文 | Polish

Contents

• Libraries
• Generation
• Crack
  • General
  • Chinese
• Tools
• Other
• Maintainers

Libraries

• mewebstudio/captcha - Captcha for Laravel 5.
• CGregwar/Captcha - PHP Captcha library.
• trekjs/captcha - A Lightweight Pure JavaScript Captcha for Node.js. No C/C++, No ImageMagick, No Canvas.
• patchca - Simple yet powerful CAPTCHA library written in Java.
• google/recaptcha - PHP client library for reCAPTCHA, a free service to protect your website from spam and abuse.
• ambethia/recaptcha - ReCaptcha helpers for ruby apps.
• anhskohbo/no-captcha - No CAPTCHA reCAPTCHA For Laravel.
• lorien/captcha_solver - Universal python API to different captcha solving services.
• WebDecoy/FCaptcha - Self-hosted, invisible CAPTCHA that detects bots and AI agents via behavioral analysis, TLS fingerprinting, and SHA-256 proof of work. Checkbox or invisible mode; Go, Python, and Node.js servers.

Generation

• captcha-api - Free, fast and reliable Captcha API POWERED BY AI
• dchest/captcha - Go package captcha implements generation and verification of image and audio CAPTCHAs.
• lepture/captcha - A captcha library that generates audio and image CAPTCHAs.
• lemonce/svg-captcha - Generate svg captcha in Node.js.
• DoubleSpout/ccap - Node.js generate captcha using c++ library CImg without install any other lib or software.
• contra/captchagen - Captcha generation for Node.js.
• jineshfrancs/CaptchaImageView - Custom ImageView to generate captcha image.
• mcxtzhang/SwipeCaptcha - Swipe captcha of Android platform.
• mojocn/base64Captcha - Golang base64-captcha supports digits, numbers,alphabet, arithmetic, audio and digit-alphabet captcha.
• koto-bank/kocaptcha - A simple captcha service with a single API endpoint, written in Rust.
• Captcheck - Lightweight, self-hostable CAPTCHA service written in PHP 7 and MySQL. Uses a selection of icons from Font-Awesome. Text-only accessibility mode and support for keyboard-only operation.
• Securimage - Open-source free PHP Captcha script.
• Lokno/click-captcha - A visual, click-based CAPTCHA for human authentication.
• ArgoZhang/SliderCaptcha - Slider captcha supporting mobile.
• PrivateCaptcha - Proof-of-Work captcha, written in Go.

Crack

General

• arunpatala/captcha - Breaking captchas using torch.
• zakizhou/CAPTCHA - Implement classification for CAPTCHA in TensorFlow.
• nladuo/captcha-break - Captcha break based on opencv2, tesseract-ocr and some machine learning algorithm.
• ypwhs/captcha_break - Captcha break using CNN with Keras.
• ptigas/simple-captcha-solver - Simple CAPTCHA solver in python 🐍.
• rickyhan/SimGAN-Captcha - Solve captcha without manually labeling a training set.
• arunpatala/captcha.irctc - Reading irctc captchas with 98% accuracy using deep learning.
• JackonYang/captcha-tensorflow - Image Captcha Solving Using TensorFlow and CNN Model.
• skyduy/CNN_keras - CNN | Keras | CAPTCHA recognition（卷积神经网络、Keras框架、验证码识别）.
• PatrickLib/captcha_recognize - Image Recognition captcha without image segmentation.
• zhengwh/captcha-svm - Use svm to hack simple captcha.
• chxj1992/captcha_cracker - Crack captcha with CNN.
• chxj1992/slide_captcha_cracker - Crack solution for slide captcha with Canny algorithm.
• JasonLiTW/simple-railway-captcha-solver#english-version - Simple captcha solver based on CNN and a training set generator by imitating the style of captcha.
• lllcho/CAPTCHA-breaking - Breaking the captcha.
• ecthros/uncaptcha - Defeating Google's audio reCaptcha with 85% accuracy.
• dessant/buster - Captcha solver extension for humans and monsters.
• kerlomz/captcha_trainer - Based on CNN5/DenseNet+BLSTM/LSTM+CTC to realize verification code identification. Only for training the model.
• NoneCap - Hosted hCaptcha solver API (regular, invisible and enterprise sitekeys) with Node.js and Python SDKs.

Chinese

• burness/chinese_hand_write_rec - Handwritten chinese recognition.
• taosir/cnn_handwritten_chinese_recognition - As the name shows, handwritten_chinese_recognition with cnn.
• soloice/Chinese-Character-Recognition - This project shows how to use CNN to perform Chinese character recognition, a much more complicated task compared to MNIST digit recognition.
• muchrooms/zheye - Chinese captcha recognition program for handstand character of zhihu.
• aaronshan/12306-captcha - Recognize 12306 captcha with deep learning.
• nickliqian/cnn_captcha - Use cnn recognize captcha by tensorflow.

Tools

• Tesseract - Tesseract Open Source OCR Engine.
• MotionCAPTCHA - MotionCAPTCHA jQuery Plugin - Stop Spam, Draw Shapes.
• Negative-captcha - A plugin to make the process of creating a negative captcha in Rails much less painful.
• Django-simple-captcha - An extremely simple, yet highly customizable Django application to add captcha images to any Django form.
• Securimage - PHP CAPTCHA Script.
• Captcha_solver - Univeral API to captcha solving services.

Other

• VisualCaptcha - A collection of all the different versions/repos of visualCaptcha.
• Hashcash for PHP/JavaScript forms - An alternative to captcha to fight spam, based on proof-of-work.

Maintainers

• @ZYSzys

Contribute

Please do! Check out the contributing.md file, or open an issue!

License

To the extent possible under law, ZYSzys has waived all copyright and related or neighboring rights to this work.