DTMF Decoder vs On
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DTMF Decoder
This utility transforms your iPhone into a DTMF tone decoder. It listens to DTMF tones through the microphone and displays the dialed numbers. Decoded digits can be easily copied to the clipboard for further use.
- DTMF tone decoding
- Microphone input
- Displays dialed numbers
- Copy to clipboard
- Source code available
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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
On
This tool assists amateur radio operators with managing on-air nets and check-ins. It offers real-time messaging, email integration, and detailed operator information retrieval. The app supports multiple simultaneous sessions and configurable displays for efficient communication and tracking.
- Real-time net check-in tracking
- Instant messaging (AIM) sessions
- Integrated email client
- Configurable information displays
- QRZ/QRZCQ call sign lookup
- WebSDR audio streaming
- QRZ Logbook integration
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On-Air Net Scraper "Personal" Pro is an iPhone/iPad/MacOS silicon App providing a wide range of features for Amateur Radio operators (Hams). Key features include NetLogger Amateur Radio On-Air Nets, Check-Ins and multiple Almost Instant Message (AIM) sessions in real-time data awareness. AIM pass key automatic email request with single button click resulting in immediate pass key information reply. Full integrated Email client for yet another method for Hams to carry out conversations. Multiple tabbed displays allowing user to track unlimited number of On-Air Net Check-Ins at one time. User configurable information displays to included viewing detailed Ham information within Check-In views. Near real-time AIM client text message send and receive. Searching and viewing Past NetLogger Nets and Check-Ins. Monitor mode so users can be aware of NetLogger Check-In "lurkers". Simultaneous QRZ and QRZCQ login is supported facilitating Call Sign lookup and Ham information retrieval. Easy, click to display NetLogger Nets, Check-Ins Call Sign and operator status information, not requiring QRZ/CQ accounts. Multi-screen displays to included improved 2-way and 3-way split screens provide simultaneous displays of Check-Ins, AIM, AIM and Net Scraper Message Exchange current listing data along with WebSDR viewing and listening. PERSISTENT WebSDR radio LIVE audio listenings while simultaneously viewing multiple Net Check-In views. Seamlessly integrates with On-Air Net Scraper Desktop Server WebSocket Interface supporting private Internet chat sessions between On-Air Net Scraper ME clients. JS8Call/WSJTX full participation in digital radio REAL-TIME texting when using NetBird VPN or when paired with On-Air Net Scraper's Message Exchange (ME) Server. Autoload favorite NetLogger nets. Callsign search both NetLogger Active and Past net listing, including improved automatic continuous search and displaying of matched nets. QRZ Logbook insert/update/delete. Supports On-Device authentication and Two-Factor authentication in addition to encrypted secure storage of sensitive data and app access security. JS8Call dynamic frequency adjustment.
Screenshots
Verdict
The clearest difference is price: On at Free against DTMF Decoder's $0.99. On also leads on rating (4.4 vs 2.5) and update cadence (monthly vs every 19 months). DTMF Decoder's advantage is iOS requirement (11.0 vs 15.6). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
On is free to download; DTMF Decoder costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On holds the better App Store score, 4.4 against 2.5. Both are backed by a comparable volume of ratings — 17 and 13 respectively. Written reviews point the same way: 40% of DTMF Decoder's written reviews are positive against 50% of On's.
DTMF Decoder ships an update every 19 months, On monthly. The most recent releases landed on October 11, 2026 and September 30, 2026 respectively.
| Parameter | DTMF Decoder | On |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 2.5 (17 ratings) | 4.4 (13 ratings) — better |
| Positive reviews | 40.4% of reviews | 50.0% of reviews — better |
| Number of ratings | 17 — better | 13 |
| Update frequency | Every 19 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 5 MB | 30 MB |
| Age rating | 4+ | 17+ |
| Developer | dreadtech.com | Christopher Robson |
Customer experience
DTMF Decoder
On
In-app purchases
DTMF Decoder
No in-app purchases
On
No in-app purchases









