@Starfarer @selfhosted been searching for a good CalDAV app for iOS forever now, I’m on the calendar side of things though, and still haven’t found one. Please update me if you find a good one!

Stock Remunders app, that's the best

I use Fantastical; pretty decent for an iOS App - if not a bit pricey.

Edit: As an important note, while I've used Fantastical for years, it's really only for the Mac ecosystem so I'm looking to move away from it.

Nowadays Morgen is my Calendar app of choice, but its iOS app isn't feature complete yep. It's fantastic on desktop, though.

Most apps integrate with reminders in some way, but only import from there. I am also looking for a long time now. The only app that comes to mind is Obsidian with the „Remotely Save“ sync plugin. I use it for notes but you can use obsidian for todo lists.