Handy List (free)

Prioritize items and tick off when done. Perfect for shopping and "to do" and lists.

HandyList allows you to manage a number of "to do" lists, a shopping list, or whatever you want to list. As you complete each item you can tick it off, and then delete all the ticked items. Items can be prioritized with colour coding and a list can be exported to a text file.

The paid version of this app, called "Handy List Plus", is the same as this free version but it has no ads, and also works stand-alone on Android Wear smart watches.