Obsidian stores notes in markdown format. There is nothing more cross platform and future proof in notes, than markdown. You just have to sync a single folder.

Obsidian stores notes in markdown format. There is nothing more cross platform and future proof in notes, than markdown. You just have to sync a single folder. Google Drive/ Dropbox/ Syncthing, etc. Any solution works. Use any markdown app on iOS - https://duckduckgo.com/?t=ffab&q=markdown+ios https://duckduckgo.com/?t=ffab&q=markdown+ios