Before shopping, do not you write it to the paper to leave the thing which I want to buy?
Where is the memo? Where is the pen?
If there is this application, I write it down with a finger quickly and can carry it.
It needs neither the memo nor the pen!
I am usable in various uses!
For example, I write down the place that does wait while talking on the telephone and can write down the poetry that I occurred to when I take a walk.
How to use is up to you!