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OrgNote - mobile app inspired by org-roam and org-roam-ui (early beta)
(about.org-note.com)
A community for the timeless and infinitely powerful editor. Want to see what Emacs is capable of?!
I do collaborate on org notes with a partner! I agree with you that true simultaneous editing is unnecessary, but it'd be nice if the app flagged that someone else is currently editing the notes and locked them until the other person is done.