Auto Secure LoginA receive-only RF survey that tells you when the silence is real.
BandSight runs phone-capability checks and guided receive-only RF field surveys — without pretending a phone is a spectrum analyzer. Its signature move: before an empty result is allowed to count as "quiet," the receiver must first prove it can hear a known reference above the noise floor. That one idea turns a survey logbook into a genuine rogue-emitter detector, because most tools can't tell a quiet site from a broken receiver.
The problem
"I found nothing" is worthless if you can't hear anything.
A field survey that reports a band as clear is only meaningful if the receiver was actually working at that frequency. A dead antenna, a wrong gain setting, or an unsupported band all produce the same reassuring — and false — "nothing here."
BandSight refuses to call a band quiet until the receiver has proven, against a known reference and the measured noise floor, that it could have heard something. Only then does an empty result count.
Honest about the hardware
- Uses the median noise floor, not the mean
- Verdicts are proven / failed / unproven — not just "clear"
- The in-browser SDR receiver is labeled UNVERIFIED
- Phone capability limits stated per browser
Capabilities
A defensible passive-discovery record.
Phone capability audit
Checks secure context, BLE, NFC, WebUSB, geolocation, and offline support — each with honest browser-specific limits.
14 band presets
FM, aviation, NOAA, marine, AIS, ISM, ADS-B and more — start a survey on the right frequencies fast.
Band-plan reference
55 allocations with caution levels, so you know what you should and shouldn't expect to see.
Instrument proof
The headline feature — a median-based noise-floor test yields a proven / failed / unproven verdict before "quiet" is allowed.
Rogue-emitter detection
Expected-versus-found comparison flags an emitter that shouldn't be there.
Baseline diff
Diff a survey against a baseline by frequency to spot what changed since last time.
Survey sessions
Structured sessions with import and merge, so a survey builds into a defensible record.
In-app SDR receiver
An RTL2832U receiver over WebUSB with FFT and demod — clearly labeled UNVERIFIED, receive-only enforced by test.
Static, CSP-clean PWA
A dependency-free PWA with 26 mutation-proven tests — receive-only is a tested invariant, not a promise.
Know the difference between quiet and deaf.
A receive-only field survey that proves its own instrument before it trusts a silence — turning a logbook into a rogue-emitter detector.