---
title: "RST DecoderX - Reviews, Revenue and Downloads in Ukraine | Apple App Store"
description: "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 correctl"
---

# RST DecoderX — Ukraine
> Simple Morse Decoder

![RST DecoderX App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/88/a9/7b/88a97b03-c919-398b-8e31-0842e5f56b04/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png)

**Developer:** [koji kamogawa](https://apptail.io/developer/koji-kamogawa-SOvb) (Japan)
**Category:** Education
**Rating:** N/A (0 ratings)
**Price:** Free
**Bundle ID:** com.hoge.RSTDecoderX
**Store:** Apple App Store
**Country:** Ukraine
**Version:** 2.1.1 (released 2026-09-01)
**Original Release:** 2023-03-13
**Languages:** English, Japanese

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/ua/app/app/id6446162988)
**AppTail Page:** [https://apptail.io/app/rst-decoderx-iMql/ukraine](https://apptail.io/app/rst-decoderx-iMql/ukraine)

## RST DecoderX Description
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

[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]


## RST DecoderX Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c7/06/27/c70627b6-fd24-62d1-0c79-e3bfafe7ec3e/ba5c77e8-2848-48be-ac8e-bd13f0140663_6_5_001B.png/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e9/5f/b6/e95fb60a-1c57-cb2a-6f05-b9bfc1a13c8e/d24bb8c7-7873-4564-ab0d-887e4e045e48_6_5_002B.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/bd/72/0f/bd720f2a-ece7-da81-d70e-721c03c0e102/Simulator_Screenshot_-_iPhone_Xs_Max_-_2026-01-23_at_20.44.18.png/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/d0/d2/75/d0d27532-6361-eaf1-2232-c78288a3c096/8aa1e007-80f6-4f21-8b75-08cfc02e76ec_6_5_003B.png/2688x1242.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/91/69/ae/9169ae82-5144-1868-d374-77656a5ba24f/Simulator_Screenshot_-_iPhone_Xs_Max_-_2026-01-23_at_20.44.24.png/2688x1242.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/10/2b/f3/102bf3b3-65c7-ffee-e699-00258fbeb70d/0fb62ef0-2f04-4a47-9885-db578b8fca42_6_5_004B.png/1242x2688.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/8c/08/3e/8c083e01-cc12-ec0c-1def-98e7358cff46/56da3ab9-f251-41a3-97c8-fb25c73c3850_6_5_005B.png/1242x2688.png)




## RST DecoderX Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Poland | Education | #23 |
| Top Paid | Poland | Overall | #159 |



## RST DecoderX Available In
- [Ukraine](https://apptail.io/app/rst-decoderx-iMql/ukraine)
- [Belgium](https://apptail.io/app/rst-decoderx-iMql/belgium)
- [Belarus](https://apptail.io/app/rst-decoderx-iMql/belarus)
- [Switzerland](https://apptail.io/app/rst-decoderx-iMql/switzerland)
- [Cyprus](https://apptail.io/app/rst-decoderx-iMql/cyprus)
- [Czechia](https://apptail.io/app/rst-decoderx-iMql/czechia)
- [Germany](https://apptail.io/app/rst-decoderx-iMql/germany)
- [Denmark](https://apptail.io/app/rst-decoderx-iMql/denmark)
- [Spain](https://apptail.io/app/rst-decoderx-iMql/spain)
- [Finland](https://apptail.io/app/rst-decoderx-iMql/finland)
- [France](https://apptail.io/app/rst-decoderx-iMql/france)
- [United Kingdom](https://apptail.io/app/rst-decoderx-iMql/united-kingdom)
- [Greece](https://apptail.io/app/rst-decoderx-iMql/greece)
- [Hungary](https://apptail.io/app/rst-decoderx-iMql/hungary)
- [Ireland](https://apptail.io/app/rst-decoderx-iMql/ireland)
- [Italy](https://apptail.io/app/rst-decoderx-iMql/italy)
- [Austria](https://apptail.io/app/rst-decoderx-iMql/austria)
- [Netherlands](https://apptail.io/app/rst-decoderx-iMql/netherlands)
- [Norway](https://apptail.io/app/rst-decoderx-iMql/norway)
- [Poland](https://apptail.io/app/rst-decoderx-iMql/poland)
- [Portugal](https://apptail.io/app/rst-decoderx-iMql/portugal)
- [Romania](https://apptail.io/app/rst-decoderx-iMql/romania)
- [Sweden](https://apptail.io/app/rst-decoderx-iMql/sweden)
- [Türkiye](https://apptail.io/app/rst-decoderx-iMql/turkey)
- [Japan](https://apptail.io/app/rst-decoderx-iMql/japan)

---

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