Many thanks to Chris Smolinski, who shares the following update:

I have a new version of Morse Pad for the iPad/iPhone/iPod Touch.

This update includes an improved decoder which better handles improper dot / dash / space timing by the sender (poor fist), automatic speed (WPM) algorithm, and adds AFC (Automatic Frequency Control), which auto tunes in the strongest signal present.

App Store Link: https://itunes.apple.com/us/app/morse-pad/id385629886?mt=8