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.
3.0.0
January 23, 2026
You can call a decoder that implements the new algorithm.
I am very sorry for your bitter evaluation. I understand and explain when this decoder doesn't always work, and I also provide a free version of the software to check. However, I would like to continue studying software improvements, even if little by little.
RST Decoder Pro is a mobile application designed to decode Morse code signals received through your device's microphone. It offers advanced features for accurate reception and practice.
It utilizes two primary decoding methods: a Band Pass Filter (BPF) decoder and a Fast Fourier Transform (FFT) decoder. You can switch between them based on your needs and reception conditions.
Yes, it features an Auto Frequency Detector (AFD) and Auto Gain Control (AGC) to automatically adjust to the strongest signal and optimize reception. The AFD may have a 1-2 second lag for tracking.
You can adjust language selection (English/Japanese), audio input level, BPF settings (frequency, bandwidth, shape), notch filter, CW speed control, and more. These allow for fine-tuning to specific reception statuses.
The app is recommended for practice and checking keying accuracy. While it decodes Morse code, users are advised to try the free version first to understand basic functions before purchasing the Pro version.
The Pro version of RST Decoder Pro includes additional functions such as a waterfall display, which provides a visual representation of the received signal spectrum, enhancing the decoding experience.
RST Decoder Pro is a paid application priced at $1.99. It is recommended to try the free version first to ensure it meets your needs before purchasing.
The application was last updated on January 23, 2026, indicating a recent development cycle. The current version is 3.0.0.
