Apps similar to GitNotes include Crossnote, which is free and open source. Other options are GitJournal, NotesHub and gitnote. In total there are four Note-taking Tools like GitNotes for Android, iPhone, iPad, the web and self-hosting.
Crossnote is probably the world's first markdown notes reader & editor Progressive Web Application that works offline and supports syncing with arbitrary git repository right inside your browser.
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With NotesHub your notes truly belong to you and not tight to any particular vendor. All of your data is stored in Git repositories, so you can clone them and manage outside the app.
