“Underscore” David Smith tells the story of the creation of his app Pedometer++, which just served up its millionth copy:
The response to it blew me away. I had put it on the store more as a whimsical tool for playing with the new hardware but it took off from day one. With 12k downloads in its first day of availability, and 30k its first week. Seeing this opportunity I worked over the next few days to get a better, more capable application ready.
I can view my daily steps in Apple’s health app, but I prefer to use Pedometer++. I’m one of David’s million downloads, and still use the app almost every day.
—Linked by Jason Snell