I just spent half an hour going through all of the app's settings and I'm in awe from the amount of work that went into it. Some of the things that made me realize the author put their heart and soul into it:
Custom filters; pages that show tasks satisfying a certain criteria, e.g. due date is up until tomorrow
Notification sound can be played repeatedly 5 times to catch your attention
Random reminders in case you're procrastinating
Optionally ignore fields you don't use in the task editing screen. I hid reminders (because the defaults are good enough), tags, location, priority. I appreciate it so much.
The fucking widget is customizable to death, you can hide the check boxes, hide the dividing lines between tasks, change the font size.
It's perfect, it's obviously on F-Droid, and it obviously syncs with Nextcloud. The widget thing was what made me write this post. They really went out of their way to make the app satisfy everyone.
I had tasks.org a few years back, but didn't appreciate all it's functionality. Just got back in to this app today and it truly is amazing. I usually assume I'm going to have a bit of compromise in an app that has a solo developer, but this really hits all the right notes for me. I'll definitely be sending this guy a donation, he's making life easier for a lot of people.