Hypernotes

I don't want to give my details, set up an account without even trying the app. So I didn't.

Easy to view your notebooks on Hypernotes, I was looking for a system that I could use on a Linux PC and phone for note taking and knowledge management. It's got good search features and is easy to navigate. However the low rating is due to a serious issue, if I type anything on the phone app and come back to it later it's gone, also in a browser and desktop app. This makes it impossible for me to write anything on the go or when ideas just come to me when I'm away from my computer.