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Platform: iOS (iPhone)
Spreets has now joined the rash of daily deals sites with their own smartphone application. Not only can you buy deals using your iPhone, but you can also manage vouchers with a "voucher wallet", which schedules reminders for when you've booked in services, and tells you when vouchers expire. You can aggregate deals purchases not only from Spreets, but also from other deals sites.
(Credit: Limco Development)
If you're the kind of person who loses their stuff all the time, then maybe Zoomzin is for you. It's an app that sets up a list of the things you lose the most, and the places where you lose them. The app records "loss patterns", and provides suggestions of where your stuff most likely is. It can also call out to friends via social media to get help to find the lost items.