NetLens: Wifi Heatmap Survey

NetLens turns your phone into a handheld Wifi survey instrument. Walk a space - an apartment, an office, a warehouse - and watch a real-time signal heatmap form beneath your steps.

HOW IT WORKS
Hold the phone in front of you and walk. The rear camera supplies visual-inertial tracking - the same simultaneous-localization machinery that powers ARCore - so every Wifi scan is anchored in 3D space by the phone's own motion. No floor plan to upload, no account, no markers on the walls. The map fills in along the path you walk; areas you do not cover stay empty.

WHAT YOU GET
- Live heatmap that grows as you move, color-graded from weak to excellent signal
- Filter the map to a single access point, or to one band (2.4 / 5 / 6 GHz)
- Drop a floor plan, sketch, or screenshot underneath the heatmap to line it up to real rooms
- Color palettes including a colorblind-friendly option
- Photo markers placed on the map and carried into the PDF
- Export a clean PDF report, a PNG image, or raw CSV samples
- Group scans into projects and export a whole multi-floor building as one combined PDF
- Extra live tools: Signal Meter, Channel Graph, AP Browser, and Connection

PRIVACY
Everything you capture stays on your device - Wifi scans, photos, notes, and exports never leave the phone until you choose to share them. No account, no cloud, no tracking or analytics. NetLens uses location permission only because Android requires it to scan for Wifi; it reads nearby networks and, if you leave location on, stamps a scan with a coarse position so it remembers which building it came from - and even that stays on the phone.

FREE AND PRO
Capture is free, with every feature, unlimited scans, and every export format. The free version shows a banner ad on the main screens and a small watermark on PDF and PNG exports. You can watch a short ad to clear the watermark on a single PDF, or make a one-time Pro purchase to remove the ad and the watermark for good - the same app, no locked features either way.

REQUIREMENTS
A device with ARCore (Google Play Services for AR) support and a working rear camera.