Open an rtl_power capture
Or drop a .csv or .csv.gz file anywhere on this page.
JSON with a name and any of channels, bands, and markers. Frequencies are Hz, or strings like "906.875M".
name
channels
bands
markers
"906.875M"
An interactive viewer for spectrum captures recorded with rtl_power. Files are read in the browser and never uploaded.
rtl_power
Derived from keenerd/rtl-sdr-misc. The palettes, the frequency tape, the time compression and the dB-to-color mapping all follow its heatmap.py, ported to TypeScript and with modifications for correctness and legibility.
heatmap.py
AI disclosure: this viewer is almost exclusively produced by Claude Code. Accountable party: k2xap.radio.