SignalSketch: WiFi Heatmap

SignalSketch helps you see where your Wi-Fi is strong and where it drops off. Sketch a room or load a floor plan image, walk around, and tap the plan to record the signal where you stand.

• Start from a simple grid, draw walls with undo, or import a floor plan picture.
• Scan nearby networks, pick one, and watch its live signal, frequency and reading age.
• Tap points on the plan to save samples and build a color-coded heatmap.
• Readings are graded Strong, Good, Fair or Weak, with each room's mean dBm.
• Compare saved levels across networks and review recent samples.
• Keep separate rooms, and export each room's samples as a CSV file.