Fldigi
Fldigi is a Mac digital modem app for amateur radio operators to send and receive text using a wide range of soundcard-based digital modes.
What is Fldigi?
Fldigi is an amateur radio communications app that helps operators send and receive digital text over radio using a computer sound card and compatible transceiver setup. It is widely used for keyboard-to-keyboard contacts, digital nets, emergency communications, contesting, and station operations that rely on common ham radio data modes. The app includes a waterfall display for tuning signals, supports many digital operating modes, and provides tools for logging workflows, macros, and radio control integration. On Mac, it stores its working data in a user folder and can be part of a broader station setup with companion tools for messaging and file transfer. Fldigi is published by David Freese as part of the W1HKJ amateur radio software project.
Key features
- Send and receive text over amateur radio digital modes using a sound card
- Tune signals visually with a waterfall display
- Use macros to automate common transmit messages and operating tasks
- Support contesting, digital nets, and emergency communications workflows
- Integrate with compatible logging and radio control setups
- Store logs, scripts, and other working files for station activity
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Safety overview
Status: Safe
Fldigi is legitimate amateur radio software. It works with audio devices and may interact with connected radio equipment or companion logging tools as part of normal operation. Its working folder can contain logs, macros, scripts, and other operating data, so use normal care before removing its files if you want to keep your station settings or history.
Recommendation: Keep Fldigi if you use digital modes in amateur radio or maintain an existing station setup that depends on it. If you no longer use it, you can remove the app, but export or back up any logs, macros, and configuration data you want to keep first.
Common paths
/Applications/fldigi.app~/.fldigi
Support paths
~/.fldigi
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