There are three morse decoders in the App Store. Same test case for all of them: “CQ CQ CQ DE DG D6FL DG6FL K” from memory of my palm paddle with 20wpm.
MorseDecoder (HotPaw Productions) Seems to work
MorseDec (Luca Facchinetti) Room for improvement
Morsepad (Black Cat Systems) Does not work at all