If you're constantly writing yourself notes to remember to pick up dry cleaning or return a book borrowed from a friend, those little scribbles are missing one thing—GPS data. But why does GPS matter? For apps like Checkmark, of course, which will remind you of all the things on your to-do list based on time and location.
Lets you designate all the places you frequent—home, work, school, a friend's house, etc.—and set up reminders for the tasks you must accomplish when you arrive or leave those locales.
Of course, Apple has had a reminders app that first showed up in iOS 5, and is now integrated into Mountain Lion, but it's not particularly reliable and eats up battery on your device. So this is a good alternative, with an attractive and easy-to-use interface. It's so simple that you just need to tap three times to set up a notification. When you walk by the wine store, for example, you won't forget to pick up a bottle of grappa for dinner.
Checkmark costs 69p for the iPhone