It is a .NET library for integrating with the RuCaptcha CAPTCHA-solving service, allowing developers to automate CAPTCHA bypass in .NET applications.

It supports image CAPTCHAs (via file or base64) and Google reCAPTCHA v2 and v3 solving.

Yes, it is fully open-source and available on GitHub under the MIT license: GitHub link.

You can install it via NuGet Package Manager with:

bash

Install-Package RuCaptchaClient

No. It is a community-built wrapper. While it's popular, it’s not officially supported by RuCaptcha.

Yes, with minimal changes! CaptchaAI supports the same API structure (/in.php and /res.php) but with better uptime, faster solving, and advanced error handling.

Yes, it returns server responses including known errors, but you must implement retry logic manually.

❌ No. RuCaptcha supports basic image and reCAPTCHA solving only. Advanced types (like FunCaptcha, GeeTest, etc.) are not supported.
✅ CaptchaAI, while also focused on reCAPTCHA and image solving, offers modular add-ons and better success rates for complex use cases.

CaptchaAI provides:

• Better infrastructure stability (lower downtime than RuCaptcha)
   
• More transparent documentation and real-time monitoring
   
• Support for manual base64, proxy, and cookie injection—vital for bypassing advanced detections.
   

You can easily adapt this client to CaptchaAI by updating the API endpoint to:
https://ocr.captchaai.com/in.php and using key instead of apikey.

Yes. CaptchaAI offers a free balance after signup for testing. RuCaptcha may require a minimum top-up before access.