Subscribe to our newsletter:

DTMF Decoder

iPhone / iPad
  • Utilities
  • Entertainment
I want this app
Download from AppStore

Completely redesigned decoder!

Turns your iPhone into a simple DTMF decoder. Simply hold the iPhone's microphone near to a clear source of DTMF tones (telephone "Touch Tones") and it will display the numbers being dialled.

A row of LEDs indicate which frequencies are present in the signal - each LED corresponds to a single frequency.

See it in action here: