ST vs DigiDecoder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ST
This app converts photos and images into a format compatible with D-STAR transceivers for the Share Picture function. Users can crop images, add text like call signs, and transfer them wirelessly or via Bluetooth to supported transceivers.
- Image conversion for D-STAR Share Picture
- Image cropping
- Add text (call signs)
- Wireless transfer to transceiver
- Bluetooth transfer to transceiver
- Save cropped image as file
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The ST-4001I is an application to crop an image used for the Share Picture function of a D-STAR transceiver, and transfers it to the transceiver. ・Photos taken, or photos/images saved on the iPhone and iPad can be converted into the format used for the Share Picture function of the D-STAR transceiver. ・You can crop the image and enter text such as a call sign. ・The cropped image can be transferred through a network to the D-STAR transceiver. ・The cropped image can be transferred through a network or using Bluetooth to the D-STAR transceiver. ・You can also save the cropped image as a file. Refer to the INSTRUCTIONS for details. Device requirements: iOS12 or later Supported transceiver (As of July 2024) Transceivers that can transfer via Bluetooth Icom ID-52A/E Icom ID-52A/E PLUS Transceivers that can transfer via network Icom IC-705 Icom IC-905 Icom IC-9700* *Firmware version 1.20 or higher NOTE • Icom does not guarantee that the ST-4001I works on all iPhone and iPad. It may not work properly, depending on the OS version, installed applications, or other reasons. • The transceiver and iPhone and iPad must be connected to the same network to transfer an image to a transceiver through a network. • Bluetooth LE is used to connect to a transceiver using Bluetooth. Transferring an image may take some time due to a slow data transfer rate.
DigiDecoder
This application decodes and encodes various ham radio digital modes in real-time. It automatically recognizes signals, displays them with an animated waterfall, and supports sending SSTV images, CW, FT8, and Packet messages.
- Real-time digital mode decoding
- Automatic signal recognition
- Animated waterfall display
- SSTV image encoding
- CW, FT8, and Packet message encoding
- Bluetooth and network TNC support
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DigiDecoder is a universal ham radio digital modes decoder and encoder. Use the built-in microphone or connect an audio cable directly for better input quality. One app for all the signals! The correct digital mode is automatically recognized and decoded in real time with an animated waterfall display. Quickly encode and send beautiful SSTV images, plus CW, FT8, and Packet messages. Bluetooth and network TNCs for Packet are supported as well. Try DigiDecoder free for 7 days. After the trial, continue with an affordable monthly subscription, or unlock lifetime access with a one-time purchase (a few months' worth). Nothing is charged during the trial and you can cancel anytime. Currently supported modes (more to come): SSTV: Robot 8 BW - 160×120 Robot 12 BW - 160×120 Robot 24 Color - 160×120 YCrCb Robot 24 BW - 320×240 Robot 36 - 320×240 YCrCb Robot 72 - 320×240 YCrCb Scottie S1 - 320×256 RGB Scottie S2 - 320×256 RGB Scottie DX - 320×256 RGB Martin M1 - 320×256 RGB Martin M2 - 320×256 RGB PD50 - 320×256 YCrCb PD90 - 320×256 YCrCb PD120 - 640×496 YCrCb PD180 - 640×496 YCrCb PD240 - 640×496 YCrCb PD160 - 512×400 YCrCb PD290 - 800×616 YCrCb Packet: AX.25 1200 - AFSK Bell 202, 1200/2200 Hz FX.25 1200 - AX.25 + Reed-Solomon FEC AX.25 300 - AFSK 1600/1800 Hz FX.25 300 - AX.25 300 + Reed-Solomon FEC IL2P 1200 AFSK - Bell 202 + RS FEC IL2P 300 AFSK - 1600/1800 Hz + RS FEC IL2P 300 BPSK - 1500 Hz DBPSK + RS FEC Weak Signal: FT8 - 8-tone GFSK, 15s periods FT4 - 4-tone GFSK, 7.5s periods JS8 - Keyboard-to-keyboard, FT8-based modulation WSPR - 4-FSK beacons, 2 min periods Narrowband: RTTY - 45.45/50/75 Bd CW/Morse - 5-55 WPM Olivia - 8/250, 8/500, 16/500, 16/1000, 32/1000 Voice: RADE - neural OFDM digital voice Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: ST at 5.0 against DigiDecoder's 4.5. ST also leads on in-app purchases (none vs 3) and iOS requirement (12.0 vs 17.0). DigiDecoder's advantage is update cadence (every 5 days vs every 27 months). On price, review sentiment, ratings volume and ads 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
Both are free to download. DigiDecoder sells 3 in-app purchases, starting at $2.99 per month. ST asks for nothing beyond the download.
ST holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 4 and 8 respectively. Written reviews split almost evenly too, at 50% and 50% positive.
ST ships an update every 27 months, DigiDecoder every 5 days. Both last shipped on October 24, 2026.
| Parameter | ST | DigiDecoder |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | 4.5 (8 ratings) |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| Number of ratings | 4 | 8 — better |
| Update frequency | Every 27 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 12 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | ICOM INCORPORATED | Lukasz Skierkowski |
Customer experience
ST
DigiDecoder
In-app purchases
ST
No in-app purchases
DigiDecoder
- DigiDecoder Monthly7 Days trial$2.991 Month
- DigiDecoder TrialFree
- DigiDecoder Lifetime$8.99








