Wunderlist

I've tried this app many times, but really fail to see what people see in it. It fails my basic use cases of even a grocery list, where I need to complete an item, have it hidden, then uncomplete it when it's needed again, easily.

But then again, Todoist also fails this. Perhaps these are great for one-time use and throw away items. I use AnyList, and would otherwise use Paperless on iOS (or now Ikiru) before either of those.

I used free version and before i decided to buy Premium version Microsoft acquired and made it free for all.

It does what is designed for. It is simple and fast. It has API we can use in our CRM. It lacks a few simple functionalities but all in all it is a great tool.