Doable - Beautiful and easy to use Todo app
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https://apt.izzysoft.de/fdroid/index/apk/at.flobii.doable
https://apt.izzysoft.de/fdroid/index/apk/at.flobii.doable
Looks very cool.
Unknown error occured when trying to connect with nextcloud. :/
Edit since I can't respond: There's an open issue https://codeberg.org/florian-obernberger/flutter-doable/issues/40 at the moment it doesn't work with nextcloud's caldav.