I use Todoist. Beside the website there are apps for nearly every device and new tasks are simple to add with their natural language support.
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Second this one
Yeah this is the only todo list app that's worked for me
https://github.com/tasks/tasks
Open source Available on F Droid. Supports sync through various services.
May be what you looking for or not. :)
Tasks a great choice, and you can trace its lineage back to the earliest days of Android. (It's a fork of Astrid, though it's been developed quite a bit since then.)
I use Microsoft ToDo, sharing would be an option (requires an MS account for both)
Anytype - An open-source Notion alternative. E2EE, cloud and local network sync, can be self-hosted.
jtxBoard, open source, syncs over caldav (works great with Zanshin) and has very active developer.
Additional it supports Material You and has included notes and journal support. Oh, did I mention it's free?
Ourgroceries is just a shopping list app, but judging from what you want it might work for you.
I've used OurGroceries for a long time and I also think it would do the job.
I've used OurGroceries for many years now, as a shopping list and as a todo list. My issue is that they recently changed to requiring GP Services in order to reduce piracy, and I've had to put it in a sandboxed profile on Graphene in order to get it to work while I look for an alternative.
It's too bad, I've always liked it for use as a shared list app.
Todoist works great and can sync with computer.
Codo (cooperative todo list) is What we use for the family as you can invite people to share and check off lists together (chores, groceries, projects, etc.)
Quillnote is a cool, simple, FOSS notes/to-do list app similar in functionality to Keep.
Only problem is that syncing is currently an experimental feature and currently only supports Nextcloud. You can create backups though.
Quillnote is my pick, I just wish they let you indent list items- I'm used to using Keep to organize all the junk in my brain, and indentations were super helpful for that
Quillpad should be preferred, it's a fork that is actively being maintained, whereas Quillnote hasn't gotten an update in over a year.
I haven't tried to use it collaboratively, but TickTick is excellent. Ever in need of something that helps me stay organized, I actually pay yearly for the premium subscription even. Really nice interface, and gives you multiple ways to manage your tasks, just depending on what works better in a given situation or for a given individual.
if you like google keep n....
then another notes is a foss app with similar ui
TickTick sounds like a good option for what you want. It's a very simple tasks list app but allows you to share those tasks with other users.
Trello
Use anylist with my wife. It has a recipe import extension on Firefox and Chrome that works awesome. It is the only app I pay money for because it is literally the app I would build if I were not totally attention starved. It has every feature I can think of and more but is pretty dang easy to use. Strong recommendation.
Why not just keep on using Keep? I've used a ton of different ones and a I keep on going back to it. It's simple and just works. Obsidian is also really nice if you need a full notebook.
goblin.tools it doesnt have an app but you can create a shortcut on your homepage. it can break down tasks to the most simple or keep it general