Best Koji Kamogawa Apps

138+ iOS apps curated and reviewed

4.7 avg rating

14 free apps

Updated August 2026

RST Decoder is the household name in koji kamogawa, but it's far from the only option. We track 138+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Compare top Koji Kamogawa Apps (August 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	RST Decoder	Free	5.0★ (7)	Yes	No	Sep 2026
2	Audio Rec/Reverse/Player	Free	—	Yes	No	Aug 2026
3	音耳せん	Free	—	Yes	No	Aug 2026
4	Voice2Memo	Free	—	Yes	No	May 2026
5	RST 599TK	Free	4.1★ (9)	Yes	No	Aug 2026
6	RST 599	Free	4.8★ (8)	Yes	No	Aug 2026
7	Morse Learn	Free	5.0★ (1)	Yes	No	Sep 2026
8	CQDX 59	Free	5.0★ (3)	Yes	No	Aug 2026

Top Picks for Koji Kamogawa

RST Decoder by koji kamogawa

Simple Morse Decoder App

Editor's Choice

📚 Education

5.0(7 ratings)

FreeAds

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.

Audio Rec/Reverse/Player by koji kamogawa

ReversePlayback & VoiceChanger

Strong Contender

🔧 Utilities

0.0(0 ratings)

FreeAds

音耳せん by koji kamogawa

OtoMimiSen

Worth Considering

🔧 Utilities

0.0(0 ratings)

FreeAds

More Koji Kamogawa apps to explore

Voice2Memo

Memo with Voice Recognition

CW QSO Simulator for HAM

Free

This application simulates Morse code communication for amateur radio operators. It supports various QSO styles, Morse code input via a touch keyer, and includes a CW decoder. Features allow for speed control, status display, and shortcut keys for common phrases.

CW QSO simulationElectric Touch Keyer inputContest style QSO support

This application simulates amateur radio CW QSOs with realistic call signs, signal levels, and CW speeds. It supports various QSO styles, including contest and rubber stamp types, with adjustable settings for a personalized training experience.

Multiple QSO styles supportedRealistic signal meterSpectrum scope display

Learn Morse code through guided steps and practice listening with random generation. Customize volume, playback speed, and tone, with added features like reverb and noise simulation for realistic training.

Step-by-step Morse code learningRandom Morse code generation for practiceAdjustable volume, playback speed, and tone

This app simulates amateur radio QSOs, allowing users to practice CQ calls and exchange signal reports. It offers realistic variations in call signs, voice quality, and signal levels for an authentic experience. Users can customize their own call sign and select various communication modes.

QSO simulation for amateur radioRealistic call sign and voice variationsCustomizable own station call sign

Spectrum&WaterFall Display App

Free

This utility app provides spectrum scope and waterfall displays for amateur radio operators. It enhances radios lacking these features by analyzing microphone input, allowing for clear distinction of Morse code and detailed audio frequency visualization.

Spectrum scope and waterfall displayMorse code distinction via FFTAdjustable waterfall speed

Ukulele and Drum Player

Practice simulated radio communications for ham radio beginners. Select various QSO elements like callsigns, names, and locations to train your listening and typing skills. Adjust frequency, speed, and volume for a personalized learning experience.

Simulated QSO communicationRandomized QSO elements (Call, RST, Name, QTH)Adjustable frequency, speed, and volume

Japanese KANA Morse Code

Free

Learn Japanese KANA Morse code with structured lessons and practice tools. Features include random generation for reception practice, adjustable sound settings, and unique functions like reverb and noise simulation for a realistic learning experience.

KANA Morse code learningStep-by-step studyRandom generation for practice

Real CW QSO Simulator

This application simulates amateur radio CW QSOs with realistic call signs, signal levels, and speeds. It supports various QSO styles, pile-ups, and includes features like RIT, CW filters, and a spectrum scope for an immersive experience.

Realistic CW QSO simulationPile-up reproduction (up to 5 stations)Multiple QSO style support

Audio Morse code Decoder

$1.99

This application decodes Morse code from your device's microphone, offering two decoding methods (BPF and FFT) with adjustable parameters. It includes features like automatic frequency detection, gain control, and real-time signal display for accurate Morse code practice and reception.

Microphone Morse code decodingBPF and FFT decoding methodsAuto Frequency Detector (AFD)

CW QSO Simulator with pileup

$1.99

This app simulates real-time CW QSO interactions for amateur radio enthusiasts. It offers various QSO styles, realistic signal conditions, and customizable station settings for an authentic experience. Features include pile-up reproduction and RIT/filter functions.

CW QSO simulationPile-up reproductionMultiple QSO styles

Spectrum & WaterFall Display

Learn Japanese KANA-based Morse code with this comprehensive practice app. It offers step-by-step lessons, random generation for reception practice, and customizable audio settings. Additional features include reverb, noise simulation, and various keying methods for realistic training.

KANA Morse code learningStep-by-step study modulesRandom generation for reception practice

📚 Education

(0)

paid

FAQ about Koji Kamogawa

What are the best koji kamogawa apps for iPhone?

RST Decoder tops our koji kamogawa apps ranking as of August 2026, with a 5.0-star average from 7 App Store ratings, and it's free to download.

Are there free koji kamogawa apps for iPhone?

Yes — 14 of the top koji kamogawa apps we rank are free to download, including RST Decoder and Audio Rec/Reverse/Player.

Does RST Decoder have ads or in-app purchases?

RST Decoder shows ads and has no in-app purchases, according to its App Store listing as of August 2026.

How many koji kamogawa apps are on the App Store?

We track 138+ koji kamogawa apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.

What is RST Decoder used for?

RST Decoder is an application designed to decode Morse code input directly from your device's microphone. It also serves as a practice tool to help users check the accuracy of their Morse code keying.

How does RST Decoder handle signal quality?

The app can decode signals with good signal-to-noise ratios correctly. However, performance may degrade for signals with poor signal-to-noise ratios, or for extremely slow or fast signals. Adjusting input signal levels and parameters is recommended for optimal performance.