Nextcloud Notes is a note-taking and syncing application that runs on Nextcloud, a cloud service you can run (and control!) yourself – even on your own hardware if you choose.
It’s simpler than Google Keep, more private depending on where you host your Nextcloud server, and in my experience it tends to sync faster.
Plus the data is human-readable since it’s stored as plain text (or markdown) in your synced folder. If you can’t access the website right then, or you want to use a local text editor, you have the files right there on your system.
The Android app from Niedermann IT is a lot faster than Nextcloud’s built-in editor and manages to open and sync cleanly and quickly even when I have a spotty cell signal.