Yes, there are apps for that but still easier, however, to jot something down on a sticky note, and more satisfying to cross off an item with real ink. With Paperback, you can do a quick sketch or make a list the old-fashioned way, and slap it on the back of your phone.
Use them one at a time, or put a small stack on the back of your phone to use later.
Paperback’s pages have a removable adhesive on most of their surface, keeping the note flat on your iPhone, For one pad, 80 sheets and are Designed for the iPhone 5/5s.
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Available Here