Caution

This is a proof of concept and has not been tested against image recognition yet, to keep your system secure use an already proven secure captcha. However if you have the skills or resources to run image recognition on some samples please see examples/ for some sample outputs.

open-captcha

open-captcha stands out from other captcha providers in a big way. Forget about connecting to external services or making your users work for free to train AI. Our approach ensures that each challenge is unique and employs the most advanced anti-ai detection methods, all while being completly self-hosted and intergrated into your web-app.

Benchmarking

To benchmark yourself first malke sure your in the backend codebase cd backend then build npm build and finally run the script npm run benchmark, please consider sharing your benchmark results by making a PR to the BENCHMARK.md.

version	os	cpu	gpu	runs	avg generation time
0.1.x-serverRendering	Linux 5.15.0-94-generic #104-Ubuntu 2024 x86_64 x86_64 x86_64 GNU/Linux	11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz	TigerLake-LP GT2 [Iris Xe Graphics]	500	279.08 /ms
0.1.x-serverRendering	Windows 10 Home 22H2	AMD Ryzen 7 3700X 8-Core Processor 3.60 GHz	NVIDIA GeForce RTX 3060 TI	500	534.71 / ms
0.1.x-serverRendering	Windows 11 Pro 22H2	13th Gen Intel(R) Core(TM) i5-13420H 2.10 GHz	Intel(R) UHD Graphics	500	703.04 / ms

Setup Guide & Installation Steps

Unfortunately, setting up open-captcha isn't straightforward for everyone. However, in some cases, all you need to do is run the npm install command.

Because open-captcha relies on headless image generation, which is not natively supported in Node.js, there are a few build requirements to consider.

First, ensure that you have the required dependencies listed below. Then, it's a matter of some trial and error from there. Make sure you have python3 aliased as python, as some tasks may require specific permissions. You can either run them as root or configure your permissions accordingly.

npm i open-captcha@latest

System dependencies

In most cases setting up open-captcha from npm should just work. However, since open-captcha uses image rendering you may run into problems and you might need to adjust your system configuration and make sure all your dependencies are up to date. For general information on building native modules, see the node-gyp documentation.

Linux

• Python 3.x
• A GNU C++ environment (available via the build-essential package on apt)
• libxi-dev
• Working and up to date OpenGL drivers
• GLEW
• pkg-config

Ubuntu / Debian

sudo apt-get install -y build-essential libxi-dev libglu1-mesa-dev libglew-dev pkg-config python3 python-is-python3

CentOs

sudo yum install -y gcc-c++ libXi-devel mesa-libGL-devel glew-devel pkgconfig python3

Windows

• Python 3.x
• Microsoft Visual Studio
• d3dcompiler_47.dll you can find another copy in the deps/ dir.

Mac OS X

• Python 3.x
• XCode

Contributing

All contributions are welcome ❤️, if you plan on contributing please read the CONTRIBUTING and CODE_OF_CONDUCT for more information.

Licensing

                    GNU AFFERO GENERAL PUBLIC LICENSE
                       Version 3, 19 November 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

For more details please read the LICENSE, To know more about the GPLA-3.0 license you can read more on the GNU official website.