Demod
Software-defined radio for iPhone, iPad & Android. Connect to an SDR server on your network or anywhere on the internet and explore the airwaves.
No hardware to plug in. Point Demod at a server you run — a Raspberry Pi, PC, or Mac with an SDR dongle — or browse hundreds of free public receivers worldwide, listed or on a map, and start listening in seconds.
Supported servers
- KiwiSDR
- OpenWebRX
- SpyServer (Airspy)
- rtl_tcp
On iPhone & iPad
Live waterfall & spectrum
Metal-accelerated, with auto-contrast that follows the noise floor. Pinch to zoom, drag or tap to tune.
Every common mode
AM, NFM, WFM, USB, LSB and CW, plus on-device CW, RTTY, PSK31 and FT8 decoders.
Public receivers worldwide
KiwiSDR, OpenWebRX and SpyServer directories with a map, reachability checks and a coverage filter.
Live Text & translation
On-device captions of what you're hearing, translated on the device into your language.
Identify
Tap to ask "what is this signal?" Demod measures it and matches it against band plans and broadcast schedules.
Clean audio
Noise reduction, a noise blanker and an automatic 50/60 Hz mains-hum filter.
Rewind, record & scan
Rewind live audio, record what you hear, and scan your memories, a band, or active signals.
Built for iPad too
A three-pane layout with the waterfall front and center, plus memories you can import and export as CSV.
Private by design
No accounts, no tracking, no ads. Demod collects no data.
Read the iPhone & iPad user guide →
Coming soon to iPhone: CarPlay, Seek to the next station, band presets for your country, and Siri.
On Android
Demod for Android brings the same receiver to phones and tablets running Android 8.0 or later. Connect to your own server or pick one of the many free public receivers — listed or on a map, sorted by reachability — and start listening.
- KiwiSDR
- OpenWebRX
- SpyServer
- rtl_tcp
Waterfall & every mode
Real-time spectrum and waterfall, pinch to zoom, drag to tune. AM, NFM, WFM, USB, LSB and CW.
Decoders
CW, RTTY, PSK31 and FT8 decoded on screen, on the device.
Live Text
On-device speech-to-text captions of what you're hearing, with on-device translation.
Identify
One tap asks "what is this signal?" — measured on the device and matched against a built-in band plan.
Band presets & scanner
Tap a band to land on it; scan your memories or a band range; record what you hear.
Listen in the background
Keeps playing with the screen off, with media notification and headset controls.