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In many cases a Markdown checklist in a shared text file works better than those dynamic task apps. Add new tasks at the bottom of the list as they come up, and cross them off when being done. At the end of a month you start a new checklist with open tasks you consider still relevant and mark them as migrated on the old list.

# Shared Tasks

## May 2023

* [X] done task
* [X] another done task
* [-] deleted task
* [>] migrated task (to next month)

## July 2023

* [ ] migrated task (from last month)
* [ ] new open task
  - comment
  - another comment
  - [ ] nested task A
  - [ ] nested task B
* [X] some done task

This way all you need is Syncthing or a cloud storage with a shared folder.

By migrating you'll get a fresh list every month, and a monthly protocoll of what has been done in the previous months.

https://usememos.com for something simple if you can selfhost the server. Companion app for ios/android.

Check out Joplin. It is pretty powerful, but can also just be used for simple checklists.

Hi, I haven't seen it suggested yet so I'll go ahead: Simplenote (https://simplenote.com). My SO and I use it for shopping and haven't had any issues.

If you know what F-Droid is, there are plenty of shopping list apps on there. All FOSS.

I really like Nextcloud Tasks. It can sync with many apps: Tasks.org (Android), Reminders (Apple devices), Endeavour (Linux), and more.

Also you can have shared lists such as a shared grocery list that can both add two while still maintaining separate accounts.

If you dont want to host your own Nextcloud, there are third party providers you can use such as woelkli.com.

For grocery, KitchenOwl. And you can add custom items. Doesn't really work as a todo list though.

I use a combination of OpenTasks, Joplin, and the standard calendar app on my Android phone. I sync that through Nextcloud with OpenSync. On the desktop I use Joplin and Thunderbird. Thunderbird handles the task and calendar data.

Joplin is a note taking app but it does have to do but I have never tried them. I tend to just make lists in my notes directly. Then for repeating or scheduled to do stuff I use OpenTasks and for appointments the calendar.

We've been using https://www.ourgroceries.com for years. It's not designed for tasks (could work, never tried), but it handles grocery lists well. Multiple stores, attach a photo to an item, setting the aisle in the store to optimize shopping.