Wunderlist is shutting down. What should I use instead?

Now that Microsoft has officially announced they're shutting down Wunderlist, what should I use instead? I'm not looking for a full project management tool, just simple collaborative task lists. https://blogs.office.com/2017/04...
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Todoist

The world's most powerful to-do list.

This is the closest match to Wunderlist that I've found so far. Perhaps a bit over-engineered for my taste and uses a subscription model, but the free version has all the key Wunderlist features: simple task lists, shared lists which update live, mac/web/phone apps. Not bad.
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