> I would like to know how does it compare against ICU

ICU is a large library, typically around ~40 MB depending on the platform, whereas Unicorn, with all features enabled, is only about 600 KB.

ICU has a broader scope: it's not just a Unicode library, but also an internationalization library. Unicorn, on the other hand, is specifically focused on Unicode algorithms.

ICU wasn't designed to be customized. It's also non-MISRA compliant and written in C++11. In contrast, Unicorn is written in C99, fully customizable, MISRA compliant, and only requires a few features from libc [1]. It's far more portable.

[1] https://github.com/railgunlabs/unicorn/?tab=readme-ov-file#u...