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:key: Curated list of awesome captcha libraries and crack tools.

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[ Daily / Weekly / Overview ]

Oct 04, 2023

Libraries

• patchca - Simple yet powerful CAPTCHA library written in Java.

Nov 30, 2021

Generation

• captcha-api - Free, fast and reliable Captcha API POWERED BY AI

May 17, 2020

Generation

• koto-bank/kocaptcha (⭐52) - 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 (⭐28) - A visual, click-based CAPTCHA for human authentication.

• ArgoZhang/SliderCaptcha (⭐234) - Slider captcha supporting mobile.

Other / Chinese

• Hashcash for PHP/JavaScript forms (⭐46) - An alternative to captcha to fight spam, based on proof-of-work.

Feb 22, 2019

Crack / General

• kerlomz/captcha_trainer (⭐2.8k) - Based on CNN5/DenseNet+BLSTM/LSTM+CTC to realize verification code identification. Only for training the model.

Feb 02, 2019

Libraries

• lorien/captcha_solver (⭐224) - Universal python API to different captcha solving services.

Dec 13, 2018

Crack / General

• dessant/buster (⭐6.4k) - Captcha solver extension for humans and monsters.

Dec 07, 2018

Crack / General

• arunpatala/captcha (⭐176) - Breaking captchas using torch.

• zakizhou/CAPTCHA (⭐67) - Implement classification for CAPTCHA in TensorFlow.

• nladuo/captcha-break (⭐711) - Captcha break based on opencv2, tesseract-ocr and some machine learning algorithm.

• ypwhs/captcha_break (⭐2.6k) - Captcha break using CNN with Keras.

• ptigas/simple-captcha-solver (⭐528) - Simple CAPTCHA solver in python 🐍.

• rickyhan/SimGAN-Captcha (⭐424) - Solve captcha without manually labeling a training set.

• arunpatala/captcha.irctc (⭐204) - Reading irctc captchas with 98% accuracy using deep learning.

• JackonYang/captcha-tensorflow (⭐930) - Image Captcha Solving Using TensorFlow and CNN Model.

• skyduy/CNN_keras (⭐280) - CNN | Keras | CAPTCHA recognition（卷积神经网络、Keras框架、验证码识别）.

• PatrickLib/captcha_recognize (⭐536) - Image Recognition captcha without image segmentation.

• zhengwh/captcha-svm (⭐201) - Use svm to hack simple captcha.

• chxj1992/captcha_cracker (⭐167) - Crack captcha with CNN.

• chxj1992/slide_captcha_cracker (⭐134) - Crack solution for slide captcha with Canny algorithm.

• JasonLiTW/simple-railway-captcha-solver#english-version (⭐755) - Simple captcha solver based on CNN and a training set generator by imitating the style of captcha.

• lllcho/CAPTCHA-breaking (⭐225) - Breaking the captcha.

Crack / Chinese

• burness/chinese_hand_write_rec (⭐1.1k) - Handwritten chinese recognition.

• taosir/cnn_handwritten_chinese_recognition (⭐470) - As the name shows, handwritten_chinese_recognition with cnn.

• soloice/Chinese-Character-Recognition (⭐198) - This project shows how to use CNN to perform Chinese character recognition, a much more complicated task compared to MNIST digit recognition.

• muchrooms/zheye (⭐779) - Chinese captcha recognition program for handstand character of zhihu.

• aaronshan/12306-captcha (⭐274) - Recognize 12306 captcha with deep learning.

Nov 23, 2018

Generation

• dchest/captcha (⭐1.8k) - Go package captcha implements generation and verification of image and audio CAPTCHAs.

• lepture/captcha (⭐923) - A captcha library that generates audio and image CAPTCHAs.

• lemonce/svg-captcha (⭐1.8k) - Generate svg captcha in Node.js.

• DoubleSpout/ccap (⭐481) - Node.js generate captcha using c++ library CImg without install any other lib or software.

• contra/captchagen (⭐179) - Captcha generation for Node.js.

• jineshfrancs/CaptchaImageView (⭐611) - Custom ImageView to generate captcha image.

• mcxtzhang/SwipeCaptcha (⭐707) - Swipe captcha of Android platform.

• mojocn/base64Captcha (⭐1.9k) - Golang base64-captcha supports digits, numbers,alphabet, arithmetic, audio and digit-alphabet captcha.

Crack / Chinese

• nickliqian/cnn_captcha (⭐2.6k) - Use cnn recognize captcha by tensorflow.

Aug 23, 2018

Libraries

• mewebstudio/captcha (⭐2.3k) - Captcha for Laravel 5.

• CGregwar/Captcha (⭐1.6k) - PHP Captcha library.

• trekjs/captcha (⭐442) - A Lightweight Pure JavaScript Captcha for Node.js. No C/C++, No ImageMagick, No Canvas.

• google/recaptcha (⭐3.4k) - PHP client library for reCAPTCHA, a free service to protect your website from spam and abuse.

• ambethia/recaptcha (⭐1.9k) - ReCaptcha helpers for ruby apps.

• anhskohbo/no-captcha (⭐1.7k) - No CAPTCHA reCAPTCHA For Laravel.

Crack / General

• ecthros/uncaptcha (⭐2.8k) - Defeating Google's audio reCaptcha with 85% accuracy.

Jun 07, 2018

Tools / Chinese

• Tesseract (⭐54k) - Tesseract Open Source OCR Engine.

• Negative-captcha (⭐793) - A plugin to make the process of creating a negative captcha in Rails much less painful.

• Django-simple-captcha (⭐1.3k) - An extremely simple, yet highly customizable Django application to add captcha images to any Django form.

• Securimage (⭐559) - PHP CAPTCHA Script.

• Captcha_solver (⭐224) - Univeral API to captcha solving services.

Other / Chinese

• VisualCaptcha (⭐406) - A collection of all the different versions/repos of visualCaptcha.

Apr 12, 2018

Maintainers / Chinese

• @ZYSzys

Feb 11, 2018

Tools / Chinese

• MotionCAPTCHA (⭐825) - MotionCAPTCHA jQuery Plugin - Stop Spam, Draw Shapes.