Are there ColorNote versions for other OS besides android, such as PC version?

For mobile, currently ColorNote supports only Android.

For PC, you can use BlueStacks to run ColorNote on your PC. BlueStacks program enables you to use Android apps on your PC just like using them on normal Android devices. Install BlueStacks for Windows and Mac, and install ColorNote on BlueStacks.

https://www.bluestacks.com/