Amateur Digital
Decode and transmit RTTY, PSK31, Rattlegram, and other digital modes on your iPhone or iPad
Join the TestFlight BetaHelp shape the app — try it early and share your feedback!
Decode and transmit RTTY, PSK31, Rattlegram, and other digital modes on your iPhone or iPad
Join the TestFlight BetaHelp shape the app — try it early and share your feedback!
Monitor multiple frequencies simultaneously. Automatically detects and decodes signals across the audio passband.
Familiar chat interface with message bubbles. Swipe to reveal timestamps, tap to transmit.
Works with external USB soundcards connected between your iPhone and radio. Full duplex operation.
Your settings sync automatically across all your devices via iCloud.
Built-in reference for digital mode calling frequencies on all HF bands from 160m to 6m.
Full transmit and receive support for popular amateur radio digital modes
Core Mode
Radio Teletype using FSK with Baudot encoding. The original digital mode, widely used in contests and DX. Configurable mark frequency, shift, and baud rate. Multi-channel decoder monitors 8 frequencies simultaneously.
Experimental Modes Beta
Phase Shift Keying at 31.25 baud with Varicode encoding. Extremely narrowband (~31 Hz), ideal for low-power QRP operation on crowded bands.
Double-speed PSK31. Same BPSK modulation with twice the throughput, useful when band conditions are good and you want faster exchanges.
Quadrature PSK at 31.25 baud. Encodes 2 bits per symbol for double the data rate of PSK31 at the same bandwidth, with built-in Viterbi error correction.
Quadrature PSK at 62.5 baud. The fastest PSK variant, combining QPSK's 2 bits per symbol with higher baud rate for maximum throughput.
OFDM burst mode with polar error-correction codes and CRC-32. Sends up to 170 bytes of UTF-8 text in a single ~1 second burst. Based on the open-source Rattlegram protocol.
Requires iOS 17.0 or later. Works on iPhone and iPad.
Any USB soundcard with Lightning or USB-C connection. Connects between your device and radio.
Any amateur radio transceiver with SSB capability. Use USB mode on all HF bands.