RST Decoder vs Morse ICR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RST Decoder
This application decodes Morse code from your microphone, acting as a practice tool to verify your keying accuracy. It offers advanced features like BPF and FFT decoders with automatic frequency and gain control, allowing for fine-tuning of reception parameters.
- Microphone Morse code decoding
- Morse practice and keying check
- BPF and FFT decoder options
- Auto Frequency Detector (AFD)
- Auto Gain Control (AGC)
- Real-time CW signal display
- Input signal recording/playback
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This is an App that decodes Morse code input from the microphone. It is a Morse practice App that you can use to check if you are keying the correct code. Signals with good S/N can be decoded correctly, but signals with bad S/N cannot be decoded correctly. Also, the performance will be degraded for extremely slow or fast signals. Usually about 5 to 10 characters are required for speed synchronization of Morse Code. Adjust the input signal so that the peak value changes from level 6 to level 7. Make fine adjustments to each parameter according to the reception status. [Additional Functions] -In addition to the decoder using BPF, a new decoder using FFT has been added so that it can be switched according to the usage. -AFD (Auto Frequency Detector) function has been added to the decoder using BPF, and BPF can be set automatically by pressing the AFD button. -The decoder using FFT automatically follows the strongest signal in the band by AFD (Auto Frequency Detector) and AGC (Auto Gain Control). You can also hold the AFD / AGC parameters by pressing the Lock button. * There will be a time lag of about 1 to 2 seconds for AFD tracking. [Control parameters] 1. Audio Input Level 2.BPF ON/OFF 3.BPF of Center Frequency 4.BPF of Band Width 5.CW Speed Control ON/OFF 6.CW Speed Control Low, Mid1, Mid2 or High 7.Delete All Decoded Text 8.Realtime CW Signal Display 9.Input signal recording / playback function *Japanese/KANA text is not supported. [Note] Since the signal after BPF is output to the audio output, it can also be used as an AF-CW filter. [URL of this App working example video] https://youtu.be/Pwp7W4m-m34
Morse ICR
This app helps you learn Morse code by sound through interactive practice and real-time audio feedback. It offers a progressive learning system, customizable sessions, and streak tracking to build your confidence and mastery.
- Interactive keyboard input
- Visual learning cues
- Progressive character introduction
- Customizable practice sessions
- Streak tracking
- Comprehensive statistics
- Adaptive difficulty
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Why Morse ICR? Because learning Morse code is about listening, not just memorizing. Morse ICR helps you develop the ability to recognize Morse code by sound, reinforcing your skills through real-time audio and interactive practice. Whether you’re a beginner or a seasoned enthusiast, this app offers a comprehensive approach to Morse code mastery. Key Features: • Interactive Keyboard Input: Practice your Morse code by typing on a keyboard specifically designed for learning. • Visual Highlights: See which keys to press with visual cues that guide your learning. • Progressive Learning System: New characters are introduced gradually, helping you build confidence step-by-step. • Customizable Practice Sessions: Tailor the number of characters, practice length, and speed for the perfect training session. • Streak Tracking & Records: Stay motivated by tracking your longest streak of consecutive correct answers! • Comprehensive Stats: Track your total correct answers, practice time, and progress across sessions. • Adaptive Difficulty: Struggling with a character? After three consecutive mistakes, the app highlights that character to reinforce learning. • Full Morse Code Support: Practice with letters, numbers, and special characters in Morse code. • Customizable Settings: Adjust settings like WPM speed and more to fit your needs. • Keyboard & Device Compatibility: Supports physical bluetooth keyboard input. • Background Tracking: Keep your progress saved even when the app goes inactive.
Screenshots
Verdict
The clearest difference is rating: RST Decoder at 5.0 against Morse ICR's 4.0. RST Decoder also leads on review sentiment (67% vs 50%) and update cadence (every 2 months vs every 4 months). Morse ICR's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, ratings volume and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
RST Decoder holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 7 and 4 respectively. Written reviews point the same way: 67% of RST Decoder's written reviews are positive against 50% of Morse ICR's.
RST Decoder ships an update every 2 months, Morse ICR every 4 months. The most recent releases landed on September 27, 2026 and September 29, 2026 respectively.
| Parameter | RST Decoder | Morse ICR |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (7 ratings) — better | 4.0 (4 ratings) |
| Positive reviews | 66.7% of reviews — better | 50.0% of reviews |
| Number of ratings | 7 — better | 4 |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 6 MB | 1 MB |
| Age rating | 17+ | 4+ |
| Developer | koji kamogawa | Jouni Erola |
Customer experience
RST Decoder
Morse ICR
In-app purchases
RST Decoder
No in-app purchases
Morse ICR
No in-app purchases








