YieldCheck App for iOS
'YieldCheck by Precision Planting Inc. provides growers with a simple way to calculate and store corn yield estimates. Users can organize estimates based on client, farm, and field. Also see the location of all of your estimates on a map with satellite imagery. It is as simple as entering kernel counts for 3 ears of corn and revealing the amount of bushels you can expect this fall. Subsequently growers can use the field report feature to see just how much of a difference one additional ear per acre can mean to their operation.'
This is a free app