NetLens turns your Android phone into a Wifi survey tool. Walk a space and a live heatmap paints itself beneath your steps, using just your camera - no floor plan, no extra hardware, no account. Spot dead zones and the best router spot. Beyond the map: a live Signal Meter, Channel Graph, Connection View, and AP Browser, plus PDF/PNG/CSV reports with photo markers. Everything stays on-device. Free does everything Pro does - one purchase removes ads and the watermark.