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I use Keep, but there are already millions of apps that does what Keep is doing. I don't think there will be a huge vacuum.

I actually really like Microsoft ToDo. Your setup can be as simple as you want or as complex as you need it to be!

Case in point, ‘To Do’ is derived from Wunderlist that has been around since 2011.

But Keep is much more than ToDo, it is more like a less capable OneNote (or, put differently, it is very much like the newer version of OneNote).