[ SIGNAL ACQUIRED ]

Every signal, logged. Every catch, shared.

Live shortwave from KiwiSDR receivers around the world. Record what you find, keep it in your logbook, and turn it into a reception report worth sharing.

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> FOLLOW @RADIOSILENCEDEV FOR NEW FEATURE PREVIEWS

[ LISTEN ]

Dial into any frequency.

Skip, drag, or type. Switch modes in a tap, watch a live S-meter, and let the signal registry name known stations as you land on them.

[ 01 · TUNE ]

Find a catch worth logging.

Explore the bands and listen to anything from news broadcasts to rare numbers stations.

[ 02 · RECORD ]

Record what you find on the spectrum.

Press and hold the waveform to start recording. Press the capsule to stop.

[ 03 · SAVE ]

Swipe up to save to the logbook. Swipe down to reject.

The captured audio lands in your logbook with its waveform, S-meter reading, receiver node, and UTC timestamp.

[ RECORD ]

Capture the signal before it fades.

[ 01 · TUNE ]

Find a catch worth logging.

Explore the bands and listen to anything from news broadcasts to rare numbers stations.

[ 02 · RECORD ]

Record what you find on the spectrum.

Press and hold the waveform to start recording. Press the capsule to stop.

[ 03 · SAVE ]

Swipe up to save to the logbook. Swipe down to reject.

The captured audio lands in your logbook with its waveform, S-meter reading, receiver node, and UTC timestamp.

[ SPECTRUM WATERFALL ]

See the signals before you hear them.

View a live spectrum waterfall straight from the node's FFT, painting ninety seconds of band history in the classic KiwiSDR palette.

VIEW: SPECTRUM WATERFALL

Spot a strong signal instantly by color, before you even tune in.

Tap the four-dot matrix in the lower-right corner to open the Operator Console, then switch on the spectrum waterfall view in the VIEW row.

Tap anywhere on the waterfall and the dial jumps straight to that frequency.
Drag the dial to fine-tune.

Press and hold the spectrum trace to record. Tap to stop, swipe up to save to the logbook, or swipe down to reject.

WEAK STRONG

[ DECODE ]

Beeps and buzzes, turned to text.

Flip on the decoder and watch CW, RTTY, FT8, and NAVTEX print as readable text, live off the air, decoded entirely on your phone. When a CW or RTTY signal sinks toward the noise, a second decode layer listens longer. It weighs whole seconds of audio at once and recovers text an ordinary decoder loses. And a dead frequency prints nothing at all. No signal means no text.

Baudot resolved in real time. DWD Pinneberg's marine weather printing under the dial, live at 50 baud. Dial the listed frequency and the tuner drops the mark/space pair right where the decoder listens.

Morse resolved in real time: a live Dutch QSO between two hams comparing radio gear, printing as readable text straight off the dial.

FT8 decoded in 15-second slots: callsigns, grid squares, and signal reports pulled straight from the digital sub-band, all on your phone.

Maritime safety traffic, printed as it arrives. Coast stations broadcast navigation warnings, weather, and search and rescue on 518 kHz, and tuning one of those frequencies switches the mode for you. Each bulletin arrives tagged with the station that sent it, its subject, and its serial number.

Press LOG for the full unfiltered transcript, then save it to the logbook with one tap. Tap SAVE again to update the saved log. Shown here: an RTTY extract, but LOG works the same for CW, FT8, and NAVTEX.

[ TUNED ON REAL OFF-AIR SIGNALS, NOT LAB TONES ]

[ OVER 2× THE TEXT PULLED FROM WEAK SIGNALS ]

[ ZERO FALSE PRINT ON DEAD AIR ]

[ READ HOW WE TEST → ]

[ MORE DECODE MODES IN DEVELOPMENT ]

[ NETWORK ]

A world of receivers, at your fingertips.

Radio Silence streams from volunteer-run KiwiSDR receivers around the planet. Watch nodes report in live with signal strength, load, and online status as you move your ears from Iceland to the Chatham Islands in one tap. Add any KiwiSDR by address and it pins to the top of your list under MY RECEIVERS.

Node selector: ALL, NETWORK and MINE filter tabs above a MY RECEIVERS section with an add receiver button, then the worldwide KiwiSDR directory with live status

[ POCKET ]

Screen off. Still listening.

Radio Silence isn't a tab you babysit. Lock the phone, drop it in your pocket, and the band keeps coming: on the walk, at the sink, on the way to sleep.

[ 01 · CARRY ]

Lock the screen and pocket the phone. The audio rides the lock screen, with playback controls right where you expect them.
[ 02 · SLEEP ]

Set the sleep timer and drift off to the shortwave. The audio fades itself out on schedule, so you don't wake to a dead band at 4 a.m.
[ 03 · RELEASE ]

Walk away and forget? A soft signal sounds first. Open the app or tap the lock-screen controls to stay tuned. Ignore it, and the app quietly hands the receiver back.

iPhone lock screen: the Radio Silence now-playing card showing the station, a LIVE progress bar, and playback controls

[ SHARED HARDWARE ]

The receivers are volunteer gear, a handful of listener slots each, run by people who opened them to the world. Radio Silence releases yours when you step away, so the next listener finds the door open. Streaming uses about 22 MB of data an hour. Considerate by default.

The receiver etiquette card over the tuner: a note on shared community receivers, an auto-release limit set to 2H, a sleep timer, and a heads-up notice toggle

[ LOGBOOK ]

Every catch goes on the record.

Every capture is saved automatically, tagged with its frequency, node, signal strength, timestamp, and date. Playback audio and scrub the waveform to hear exactly what you caught. Search your whole history by keyword, station, or band. Sort your logbook alphabetically, by date, frequency, signal strength, or mode.

[ SHARE ]

Proof you pulled it out of the air.

Every catch in your logbook is shareable as a Reception Report: a clean data card with the frequency, node, waveform, and the space weather that carried the signal. Catch a rare signal and the app generates a Rare Intercept Card with its own rarity score. Export each card as a PNG or an MP4 that carries your actual recorded audio. Then share it with others or post it online.

Reception Report card: frequency, UTC time, mode, node, and a waveform snapshot — [ RECEPTION REPORT ]

Rare Intercept card: a rare capture stamped with its rarity score — [ RARE INTERCEPT CARD ]

[ NY6TC IS A FICTIONAL CALLSIGN, SHOWN FOR ILLUSTRATION ONLY ]

10 11 12 13 14 15 16 9996.0 CWRWM MOSCOW 11384.0 USBCENTRAL W. PACIFIC 19m · 15.7 MHzBBC WORLD SVC +2 15016.0 kHzUSB · HF-GCS

[ FAVORITES ]

Your frequencies, on file.

Save a station with its own label and mode. One tap re-tunes the dial, and the app quietly picks the best live receiver to hear it on.

Favorites: saved frequencies with labels and modes

[ WE DON'T LISTEN BACK ]

Radio silence means radio silence.

We built a listening app that doesn't listen to you.

NO ANALYTICS ON WHAT YOU LISTEN TO. WE DON'T KNOW WHAT'S ON YOUR DIAL.
MAKING AN IN-APP PURCHASE SHARES AN ANONYMOUS RECEIPT, AND WHICH FEATURE PROMPTED THE UPGRADE OFFER, FOR SUBSCRIPTION TRACKING. NEVER ANYTHING ABOUT YOUR LISTENING.
NO ACCOUNTS. NOTHING TO SIGN INTO, NOTHING TO LEAK.
AUDIO STREAMS DIRECT FROM THE KIWISDR NODE YOU PICK. NEVER THROUGH OUR SERVERS.
LOGBOOK & RECORDINGS STAY ON-DEVICE OR IN YOUR OWN ICLOUD.
PAYMENT IS HANDLED ENTIRELY BY APPLE. WE NEVER SEE YOUR CARD DETAILS.

[ Read Full Privacy Policy ]

Every signal, logged. Every catch, shared.

Dial into any frequency.

Find a catch worth logging.

Record what you find on the spectrum.

Swipe up to save to the logbook. Swipe down to reject.

Capture the signal before it fades.

Find a catch worth logging.

Record what you find on the spectrum.

Swipe up to save to the logbook. Swipe down to reject.

See the signals before you hear them.

Beeps and buzzes, turned to text.

A world of receivers, at your fingertips.

Screen off. Still listening.

Every catch goes on the record.

Proof you pulled it out of the air.

Your frequencies, on file.

Radio silence means radio silence.

The bands are open.