Phone ScanBluetooth, NFC, location and connection capabilities exposed by the current browser.
Mobile RF visibility
See what your phone can sense.
Expand into wideband receive-only surveys.
BandSight separates honest phone capability checks from optional RTL-SDR hardware. It records evidence locally, explains every limitation, and never transmits, jams, deauthenticates, captures credentials, or attempts to defeat encryption.
Receive-only
Permission-based
Local-first records
Phone APIsChecking…
SDR pathChecking…
Saved observations0
SDR SuiteRTL2832U hardware check, antenna guidance, survey presets and a compatible browser receiver launch path.
Field ReportLocal observation log, privacy-aware metadata and portable JSON or CSV export.
Mode 01
Phone Scan
A normal phone is not a general-purpose spectrum analyzer. BandSight tests only the interfaces the operating system and browser actually expose, and labels unavailable functions instead of fabricating results.
Current device
Capability audit
Permission-based tools
Use available sensors
Select a Bluetooth LE device
The browser opens its own chooser. BandSight cannot silently enumerate every nearby device from a PWA.
Read an NFC tag
On supported Android browsers, hold an NDEF tag near the phone. Payload contents are not stored; only tag metadata is logged.
Add approximate location
Location is opt-in and rounded before storage. It can help distinguish observations made at different authorized sites.
Mode 02
SDR Suite
Add a receive-only RTL-SDR dongle through USB-C OTG. BandSight checks the USB device, prepares a scoped survey, and can launch a compatible browser SDR engine for live spectrum and audio.
Nooelec NESDR SMArt v5 Bundle
RTL2832U + R820T2/R860 receiver with magnetic base and three antenna elements.
- Published tuning range
- 100 kHz–1.75 GHz
- Instantaneous bandwidth
- Up to 3.2 MHz
- Phone support
- Android + USB-C OTG
- Amazon product ID
- B01GDN1T4S
A USB-C OTG data adapter or powered hub may be required and is not included in the bundle. HF reception needs an appropriate antenna and may require a different receiver workflow.
WebUSB preflight
Not checked
Check the receiver
- 1
Connect the RTL-SDR to a USB-C OTG data adapter or powered hub.
- 2
Use a Chromium-based browser over HTTPS and grant access only to the Realtek RTL2832U device.
- 3
Run the hardware check, choose a survey preset, then launch the live receiver.
Authorized field survey
Launch live browser receiver
Prepare a receive-only scan
Survey presets
BandSight safety boundary
Receive only. Do not transmit, jam, replay controls, defeat encryption, capture credentials, or retain private communications. Use only on your own equipment, public broadcasts, or within written authorization and applicable law.
Live receiver — in-app
Spectrum, waterfall and audio
Unverified against real hardware. This driver has never been run with an RTL-SDR attached. If the spectrum stays flat, suspect this code before you suspect the antenna — a blank display is not evidence that the band is quiet.
—
Receiver idle.
MHz
Demodulation
Records the demodulated audio to a local .wav file you download. You are responsible for complying with local law.
Mode 03
Field report
Observations remain in this browser until exported or deleted. BandSight avoids storing NFC payloads, Bluetooth traffic, audio, credentials, or decoded private message content.
Declare what should be radiating
Anything found that is not on this list is flagged. Without it, every emitter looks equally normal.
MHz
Compare against an earlier survey
Load a previous report to see what has appeared since. Matching is by frequency, not by record, because a re-survey mints new IDs for the same emitter.
Session evidence