# CW Decoder — Morse Code Decoder

> Morse Code Decoder (iPhone/iPad app by Keiya Chiba.)

- Source: https://appshunter.io/ios/app/cw-decoder/id6748900681 (this page in markdown: same URL + `.md`)
- Developer: [Keiya Chiba](https://appshunter.io/developer/1740986591)
- Category: Entertainment, Education
- Price: Free with in-app purchases (on sale, was $2.99)
- Age rating: 4+
- Requires: iOS 17.2 · 1 MB
- Languages: American English, Japanese
- Released: 2025-08-15
- Data updated: 2026-09-09
- User reviews in markdown: https://appshunter.io/ios/app/cw-decoder/id6748900681/reviews.md

## What is CW Decoder?

High-Precision Morse Code Decoder

Achieve noise-resistant, accurate Morse code decoding with high-precision, sample-level signal processing. Try the superior “listening performance” in the free version.

Differences Between Free and Full Versions
This app lets everyone try the high-performance decoding engine for free.

Free Version
- Continuous decoding: Up to 3 minutes per session (restart anytime, unlimited times)
- Basic font display
 Ideal for testing performance and checking short communications.

Full Version (Paid Add-on)
- Unlimited time: For long ragchews and continuous monitoring
- Font settings: Customize font type and size for better visibility
 Recommended for active operation and a stress-free learning experience.

Main Features & Technology

High-Precision Real-Time Decoding
- Speed range: 5–50 WPM (auto-adjust speed and threshold)
- Frequency detection: 400–900 Hz (automatically tracks the strongest signal)

Advanced Signal Processing
- Bandpass filter: Narrowband filtering reduces unwanted noise
- AGC (Automatic Gain Control): Compensates for signal level changes and fading
- Noise blanker: Reduces spike noise using MAD (Median Absolute Deviation)
- Signal stabilization: Multi-sample buffering helps prevent false detections

Designed for Real-World Use
- Scrollable text: Review and check missed content
- Frequency lock: Tracks the actual operating frequency range (400–900 Hz)
- Visual support: On-screen text supports listening and copying

Recommended For

Morse Code Beginners
Great for those getting started with Morse code. Seeing decoded text while listening helps self-correction and improves learning efficiency.

Amateur Radio Operators
- CW practice: Compare results with your own copying to find weak points
- Contests: Helpful for high-speed reception support and log checking
- Portable ops: No PC needed—build a CW reception setup with just a smartphone

Comeback Hams & Experts
Useful for reducing fatigue during long monitoring sessions and supporting operators with hearing decline. Powerful filtering helps decoding in weak-signal or interference conditions.

Note: Microphone permission is used only for signal analysis. No audio is saved or transmitted.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Full Version | $2.99 | one-time |



## Version history (last 5 releases)

### 3.32 — 2026-08-31

v3.32
- Improving decoding rates in production environments
- Other minor bug fixes

### 3.31 — 2026-08-13

v3.31
- Improving decoding rates in production environments
- Other minor bug fixes

### 3.30 — 2026-07-22

v3.30
- Improving decoding rates in production environments
- Other minor bug fixes

### 3.29 — 2026-07-20

v3.29
- Improving decoding rates in production environments
- Other minor bug fixes

### 3.28 — 2026-07-11

v3.28
- Improving decoding rates in production environments
- Other minor bug fixes

## Apps similar to CW Decoder

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [MorseFriends](https://appshunter.io/ios/app/morsefriends/id1447086076) | — | Free | Entertainment |
| [Mr. Smith's LAVIE for iPhone](https://appshunter.io/ios/app/mr-smiths-lavie-for-iphone/id642024768) | — | $1.99 | Entertainment |
| [幕コレMINI 近畿日本鉄道2610系](https://appshunter.io/ios/app/mini-2610/id6752216870) | — | $5.99 | Entertainment |
| [NiN10: Nintendo Emulator](https://appshunter.io/ios/app/nin10-nintendo-emulator/id6503959130) | 4.1 (21) | Free | Entertainment |
| [Warrios](https://appshunter.io/ios/app/warrios/id6754468822) | — | Free | Entertainment |
| [Morse Code Translator!](https://appshunter.io/ios/app/morse-code-translator/id6742086747) | — | Free | Entertainment |

## More apps by Keiya Chiba

- [Morse Straight Key](https://appshunter.io/ios/app/morse-straight-key/id6496373450)
- [Morse News](https://appshunter.io/ios/app/morse-news/id6751747688)

All apps by Keiya Chiba: https://appshunter.io/developer/1740986591

## Related topics

[morse decoder](https://appshunter.io/ios/topics/morse-decoder) · [morse decoder pro](https://appshunter.io/ios/topics/morse-decoder-pro)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-09.*