Show HN: I built a Mac to do app to scratch my own itch

I write things down because my ADHD brain is always all over the place, and never found a to do app that takes less effort than pen and paper, so I made one. After years of running my life on Supreme, I finally gave it a much needed update.

Supreme runs offline and I don’t store any personal data, so it’s only available for Mac and iOS for now syncing over iCloud. Any suggestions for what I should use for universal sync (i.e. +PC, Android) without running a server with users’ data on it? Thanks!