Morse Code Decoder App
Morse code (CW communication), cherished by amateur radio operators around the world, now comes to life in a whole new way.
Invented in 1832 by Samuel Morse, this historic yet enduring method of communication—built from simple combinations of short and long tones—still captivates enthusiasts today.
With this iOS app, you can enjoy the iconic “dit-dah” tones of Morse code using modern smartphone technology. It receives Morse code in real time, converts it into text, and displays it instantly. High-precision, sample-level signal processing ensures exceptionally accurate decoding for an authentic and reliable experience.
App Features
Real-Time Audio Decoding
Using your smartphone's built-in microphone, the app analyzes live Morse code signals in real time and instantly decodes them into readable text. Whether you're practicing with sample audio or receiving actual on-air signals, this tool has you covered.
- Speed Range: 5–50 WPM (speed and thresholds auto-adjust)
- Fully automatic frequency detection: 400 Hz–900 Hz
- Font settings: Supports size and font selection
- Bandpass Filter: Narrow-band filter for noise reduction
- AGC (Automatic Gain Control): Automatically compensates for signal strength variations to ensure stable reception
- Noise Blanker: Removes spike noise based on MAD (Median Absolute Deviation)
- State Change Stabilization: Multi-sample buffering to prevent false detections caused by noise
Feature-Rich Design for Practical Use
Smoother decoding with fully automatic frequency detection
Automatically analyzes incoming signals and detects the frequency of the strongest CW signal.
Supports flexible font size and style customization
・Users can freely choose the font size and type (monospaced or proportional).
Visual Display Support
Even beginners who find it difficult to listen can visually follow the code and learn effectively.
• Easy-to-read, scrollable text display for reviewing past decoded messages
• Intuitive interface for stress-free operation and smooth learning
Perfect For...
Morse Code Beginners
Ideal for those curious about Morse code but unsure where to start. Visual aids help you understand the structure of Morse code, significantly enhancing learning efficiency.
Amateur Radio Operators
- Improve CW practice: Compare decoded output with what you hear to identify weak points
- Contest support: Practice copying high-speed CW and check your logs
- Portable operations: Use as a decoding aid in mobile or field environments
Advanced Operators & Contest Enthusiasts
The real-time visual feedback makes this app a powerful tool for improving high-speed CW reception and monitoring during contests. Even under weak-signal or noisy conditions, visual assistance enhances decoding accuracy.
Rediscover the Beauty of Morse Code
Morse code is far from outdated—it continues to thrive among amateur radio enthusiasts even in today’s digital world, valued for its simplicity and reliability.
- Elegant simplicity: Express all characters using only two elements—dots and dashes
- Noise resilience: Reliable communication even in poor conditions
- Universally understood: A common language that transcends borders
- Brain stimulation: Recognizing rhythms and patterns also offers cognitive training benefits
Try It Free for 7 Days
A 7-day free trial is available so you can explore all features without commitment. After the trial, a one-time payment grants unlimited access—no subscriptions required.
If you're looking to rediscover the joy of amateur radio, improve your Morse code skills, or simply explore a new way to engage with CW, download Morse Code Decoder and take your first step into the fascinating world of Morse communication.
※ Note: Microphone access is required to use this app.
Modification history
【version 1.8】（2025/12/14）
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Rapid Tracking: Dramatically improved adaptation to WPM speed changes (Instant Adaptation).
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High-Precision Detection: Enhanced signal capture with high-density frequency scanning (50Hz steps).
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Signal Lock: Improved noise resistance and stability via the new Signal Lock feature.
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Other minor bug fixes.
Privacy Policy
Overview
This app does not collect or use any personal information from its users.
Information Collection
This app does not collect any personal information from its users.
Use of Information
This app does not use any collected personal information because it does not collect any.
Contact Information
If you have any questions regarding this privacy policy, please contact us at Email Address.
E-Mail: jh1lhv@jarl.com
