Why I Built a Lightweight (~473 KB) Username Checker in C++17

I wanted a fast, lightweight way to check usernames across multiple platforms without the bloat of heavy runtime dependencies. So, I built JustUser.

It's a native C++17 command-line tool that uses libcurl to query 45+ platforms efficiently. The compiled binary is under 500 KB (~473 KB) and runs entirely out of the box.

Zero runtime dependencies
Easy to extend via a simple sites.json configuration file

You can check out the source code and pre-compiled binaries on GitHub:
https://github.com/yemxpc/JustUser

Feedback, contributions, or ideas are always welcome!