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A lot of this is solved by todo.txt format ( https://github.com/todotxt/todo.txt )

There are apps that support it on many platforms and it is easy to sync across devices.

I published https://todotxt.in a week ago. Browser based, saves txt in the browser local storage.

Sometimes I like to imagine early people inventing, forgetting about and inventing the wheel again.

Now that I think about it that probably actually happened, considering the large distances between groups.