Downloaded this app yesterday and tested it on a few of my sons new coins.

Find it a pain to try and re-read writing that's been rushed down at an event but this app lists the numbers ready for a mass discovering. 
Had a few issues that it can take a while to read a number sometimes I had to give up even when the number was clear to see as it just wouldn't read it.

Currently as its free you can only do 5 at a time to do an unlimited number its an in-app purchase to upgrade its £3.99 so I might purchase it but only after a few more test runs on our coins to check it picks them up every time