NoteRiot is the easy to use note taking app. Notes are accessible everywhere, easily searchable so you always find what you need. Always private, always secure.
Decentralized apps are catching up quickly to their centralized counterparts. I have used EverNote, SimpleNote, even NVAlt (notational velocity), but care about my privacy and so have been migrating over to one note, and don't miss my old apps yet!
The tagging system is very intuitive, and has a slick interface.
There is no desktop app yet, but works great on both desktop Blockstack browser and mobile Blockstack browser.