Quillpad is worth looking into.

My wife was a Keep freak and I was able to get her to switch over to Jotty. It is self hosted though.

I am a barbarian. I just keep my tasks in a list of notes and then put an "X" beside them when they are finished.

I use Fossify Notes from fdroid

My partner and I use Obsidian and Obsidian Sync using this tutorial.

https://forum.obsidian.md/t/obsidian-as-recipe-manager-and-shopping-list-tutorial/40799

It's a little buggy at times, and was somewhat oainful to set up, but it's been working for a couple years now.

It syncs to all of our devices. What's cool is I've created a recipe template that syncs to the shopping list. So when I uncheck any ingredient in a recipe, it adds it to my shopping list.

I built tinylist.app a few years back and while it’s still chugging along, it’s basically in maintenance mode now.

The best todo list I found is Vikunja which syncs with Tasks.org app, but it can't handle reminders well and doesn't work with Google assistant.

I think it's crazy that Keep out of of all the Google apps is without a 1:1 replacement.

Joplin is great, and I've been testing https://tikski.com/ lately and really enjoying it.

NotallyX is the only one I've used that has the ability to indent items to create sublists, which I need. its not quite as stable as some options though, I occasionally get a bit of jank. Though I haven't seen any odd behavior for a while so maybe that has improved, not sure

Edit: meant to say NotallyX. Regular notally doesnt have indentable lists to my knowledge

Tasks.org or any markdown editor plus syncthing.

I've switched to Obsidian with the Tasks plug-in. It is not as simple as Keep, but it does have checkboxes (and the "enter to create new task" functionality we both like). I keep it synced across devices via SyncThing on my home server.

Just saved this to Keep to come back to later

Simple Notes