OpenNotes

The powerful tool to mage your notes - now open-source.

Source codes are available at https://github.com/vadniks/OpenNotesMirror

Doesn't contain ads, payments or analytics - since 3.0.0 version

The key features:
creating/managing usual/audio/drawn notes,
widgets,
encryption,
different reminders,
light and dark themes,
syncing between deices
and much more...