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Google keep

I love Google Keep, but I am afraid they'd kill it all of sudden much like Google Notebook and Inbox.

So what? Use it till you can. The worst case scenario is that I have to spend half an hour again to pick a todo app sometime in the future :)

sure, but beware if you want to export your data from google keep, it will be HTML and not easy to import to most other tools

It's part of GSuite, which is a higher threshold of support and predictability. Neither Inbox or Notebook were part of GSuite.