# DTMF Decoder

> iPhone app to decode DTMF tones and copy dialed numbers. (iPhone/iPad app by dreadtech.com.)

- Source: https://appshunter.io/ios/app/dtmf-decoder/id306195275 (this page in markdown: same URL + `.md`)
- Developer: [dreadtech.com](https://appshunter.io/developer/306195278)
- Category: Utilities, Entertainment
- Price: $0.99
- Rating: 2.50/5 from 17 App Store ratings · 57 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 5 MB
- Languages: American English
- Released: 2009-02-25
- Data updated: 2026-09-09
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/dtmf-decoder/id306195275/reviews.md

## What is DTMF 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.

See it in action here:
https://www.youtube.com/watch?v=l_QD8KFCJPw

Source code freely available:
https://github.com/veghead/ios-dtmf-decoder

## Key features

- DTMF tone decoding
- Microphone input
- Displays dialed numbers
- Copy to clipboard
- Source code available

## Recent user reviews (10 of 57)

All indexed reviews: https://appshunter.io/ios/app/dtmf-decoder/id306195275/reviews.md

### 2/5 — 45 year PBX Installer here

*2025-11-09*

I tested this in multiple environments and with multiple sound levels. This App needs to buffer the DTMF better because there are far too many “double digits” that occur. I also have “Phonal Tonal,” and that also generates errors, but it outperforms this App even in quiet ambient conditions. Very disappointing. Phonal Tonal seems to generate random (phantom) numbers when no DTMF is present, which this App doesn’t seem to do, but it still shouldn’t put in multiple digits when only one digit was pressed. I think this should be a minor tweak in software.

### 1/5 — Not good

*2025-02-07*

Doesn’t work well.

### 1/5 — DOES NOT WORK DON’T BUY

*2024-04-02*

iPHone 13. iOS 17.4.1 

Never displays anything

### 1/5 — This app doesn’t work

*2024-03-01*

Tried every imaginable setting, rebooted phone multiple times (iPhone 10) and nothing would get this app to work.

### 5/5 — Funktioniert

*2023-10-08*

Simple Idee gut und liebevoll umgesetzt. Wollte wissen, welche Tonfolge am Anfang von Vienna Calling (Falco) gespielt wird. Nach etwas Justierung in den Einstellungen hat es dann auch funktioniert.

### 1/5 — Piece of crap doesn’t work

*2023-10-03*

Don’t buy! I had a cleanse load send signal and it would not pick up tones. These filthy trash con artists stole my .99. Don’t you fall for it

### 1/5 — Useless

*2021-09-07, version 1.8.2*

Does not work. How do I report this useless app to the store?

### 5/5 — Works great!

*2021-01-10*

I needed used this to diagnose an issue with a call box for an apartment building. It worked great!

### 3/5 — Update

*2021-01-08*

Any way to get this work with new iPhone update???
Great app but now it won’t work....

### 5/5 — Works great!

*2020-11-30*

We played around with it, and it picked up the tones and got them correct.

## Frequently asked questions about DTMF Decoder

### What does this app do?

This application turns your iPhone into a DTMF decoder. It listens to DTMF tones, also known as telephone 'Touch Tones,' through your device's microphone and displays the numbers being dialed in real-time.

### How do I use the app to decode tones?

Simply hold your iPhone's microphone near a clear source of DTMF tones. The app will then display the decoded digits. You can also copy these decoded digits to the clipboard from a text area within the app.

### Is this app free to use?

Yes, the application is completely free to download and use. There are no in-app purchases or advertisements associated with its functionality.

### What devices is this app compatible with?

The application is designed for iPhones. Specific iOS version compatibility is not detailed, but it functions as a utility on the iOS platform.

### Can I use this app for technical purposes?

Yes, the source code for this application is freely available on GitHub. This allows developers and technically inclined users to examine, modify, or integrate the decoding functionality into other projects.

## Version history (last 5 releases)

### 1.11.1 — 2023-08-09

Rebuild for OS11+.

### 1.11.0 — 2023-08-02

Rebuilt for iOS 11+

### 1.8.2 — 2017-01-24

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

### 1.8 — 2016-12-20

Reworked for iOS 10. A textview has been added for decoded digits - not only does this allow a longer string of digits to be displayed, it also allows copying to the clipboard directly.

### 1.5 — 2010-09-29

Replaced the detection engine entirely - now much more sensitive and accurate. Added the ability to copy detected tones to the clipboard. Added a settings page that allows altering detection parameters. Brighten "LEDs".
Source code now available under GPL!

## Apps similar to DTMF Decoder

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [iFTx](https://appshunter.io/ios/app/iftx/id6446093115) | 4.2 (70) | $1.99 | Utilities |
| [Dialer](https://appshunter.io/ios/app/dialer/id482793462) | 3.9 (74) | Free | Utilities |
| [DTMF Dialer Tool](https://appshunter.io/ios/app/dtmf-dialer-tool/id6748663059) | 4.5 (13) | Free | Utilities |
| [ClearNode](https://appshunter.io/ios/app/clearnode/id1450732334) | 4.8 (32) | Free | Utilities |
| [DTMFdec](https://appshunter.io/ios/app/dtmfdec/id363385252) | 3.4 (5) | $2.99 | Utilities |
| [Blue Box](https://appshunter.io/ios/app/blue-box/id391832739) | 5.0 (3) | $4.99 | Utilities |

## Related topics

[dtmf decoder](https://appshunter.io/ios/topics/dtmf-decoder) · [dtmfdec](https://appshunter.io/ios/topics/dtmfdec) · [dtmf](https://appshunter.io/ios/topics/dtmf) · [Decoda](https://appshunter.io/ios/topics/decoda)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-09.*