Dangerhart

For that one it's not the widgets but the notes behavior. She wants check lists that self organize as they get checked. In the app itself she wants the post-it note like layout

Edit: multi layout that shows the contents instead of just title would be nice too

I would love a replacement for keep. I'm currently running nextcloud and the UI differences or lack of android widgets are keeping my wife from switching. Most of of your list already has great replacements that exist but for some reason a keep competitor that is current just doesn't exist

Carnet is a nextcloud app that comes pretty close and but it needs a TON of TLC on the server side. I keep telling myself I'll work on it but life gets in the way. If you have time and know node/php I would suggest looking there instead of making yet another note app. Nextcloud can handle sharing and has some encryption stuff as other plugins etc. Otherwise keep posting here, I would love to follow your progress.

Are you using your router as DNS and DHCP? With Verizon I had a security setting that was blocking public DNS entries to resolving to local addresses. I can't remember what it's called, but it's to prevent a certain type of attack. For a while I disabled it but switching to pihole as DNS, DHCP and using unbound solves it without the security implications