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DTMF Decoder


This app is only available on the App Store for iOS devices.


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 dialed. The decoded digits are also placed into a text area from which you can copy them to the clipboard.

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

See it in action here:

Source code freely available:

What's New in Version 1.8.2

Restored the ability to capture tones when the app is in the background.

iPhone Screenshots

iPhone Screenshot 1
iPhone Screenshot 2

Customer Reviews

Poor performance

Only usable on an iPhone 6S Plus at full sensitivity, and works poorly then.

DTMF Decoder
View in iTunes
  • $0.99
  • Category: Utilities
  • Updated:
  • Version: 1.8.2
  • Size: 1.6 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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