Plug in an RTL-SDR and connect

Spectrum, waterfall and audio start as soon as the dongle is streaming. Everything runs in this tab. No server touches the radio.

Works with

RTL-SDR Blog V3 and V4, Nooelec NESDR, and generic RTL2832U sticks with R820T, R820T2 or R828D tuners.

Chrome or Edge 89 or newer, desktop or Android. Firefox and Safari do not implement WebUSB.

Driver setup if Connect fails

Windows: Run Zadig, choose Options, List All Devices, pick Bulk-In, Interface (Interface 0) and install WinUSB.
Linux: Unload the TV driver with sudo rmmod dvb_usb_rtl28xxu, blacklist it in /etc/modprobe.d/, and add a udev rule giving your user access to 0bda:2838.
macOS and ChromeOS: No driver needed.
Android: Chrome with a USB OTG adapter. Accept the USB permission prompt.
Any OS: Close SDR#, SDR++, GQRX, rtl_tcp and anything else holding the dongle.

Bandwidth 180 kHz De-emphasis

Tuner gain 29.7 dB

Tuner AGC RTL AGC Bias-T Offset tune

Sample rate Direct sampling Correction ppm

Volume

Squelch

Open

Step Service

Scan level

-55 dB

Hold 1.5 s

Idle. Add channels, or switch to Sweep.

FFT size

Reference 0 dB

Range 80 dB

Averaging 0.50

Zoom Palette

Peak hold