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What do you use for notes?
(lemmy.selfhostcat.com)
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
I've been using Joplin for years. I self host Joplin server for sync as well. Join does support offline use. Each device has a local copy of the notes and if you're offline you can use the app to access and edit existing notes as well as creating new ones. When you regain a connection the sync will automatically update the notes and those updates will proliferate to any other devices with Joplin