It appeals to me as a minimalistic version of the Bear[1] notes app.

A few years ago I played around with copying the Bear app interface for the web, the idea was to create a visually identical mockup of the app so you could immediately visualise changes made when customising various theme values. I stalled with the implementation of the last part, but the rest of it is up at bear.christippett.dev

[1] https://bear.app