HollowMap
Find every dead spot in your Wi-Fi. Then fix it.
Walk your property with a phone, tablet, or laptop. HollowMap records GPS-tagged signal samples and paints them on a satellite map — signal, speed, humidity, and AP coverage all side by side.
"It's slow in the back bedroom."
Wi-Fi coverage is invisible. You can't fix what you can't see — and walking the place with a phone app is guesswork without GPS, history, and the controller's view of every AP.
Dead Spots Are Invisible
Without a map of where the signal actually drops, you're moving APs and crossing fingers.
AP Placement Is Guesswork
Should the next AP go on the garage, the eaves, or the hallway ceiling? Coverage data tells you.
No GPS, No Memory
Most signal meters don't tag where you stood. So you can't compare runs, before/after, or weather.
A Survey, A Map, And A Plan
Walk-the-Property Survey
- ✓ Open the web UI on any phone / tablet / laptop on Wi-Fi — no install
- ✓ Tap record, walk; GPS-tagged samples log automatically
- ✓ Optional speed test at a point (download / upload / latency)
- ✓ Label runs (e.g. before-mesh, humid-day) to compare later
Satellite Coverage Map
- ✓ Color by signal, speed, AP, device, or humidity
- ✓ Toggle dots, walk path, AP pins, and heatmap layers
- ✓ Filter by device, run, and date range — live, no Apply button
- ✓ AP aim rays show which way each radio is pointed
UniFi & Omada Aware
- ✓ Polls your controller for live AP and client signal
- ✓ Enriches each sample with which AP it was on
- ✓ Works without a controller too — GPS-only mode
- ✓ Local, on your LAN — your survey doesn't leave the house
Place & Aim APs
- ✓ Drop AP pins on the map where you actually plan to mount them
- ✓ Set an aim direction for directional antennas
- ✓ Re-survey after the change to see the delta
- ✓ Native Android collector in development for offline runs
How It Fits Together
Server + Desktop App
Runs on a Windows machine wired to your switch. Hosts the map, stores samples, polls the controller. WebView2 UI in a tray app.
Any Device
Phone, tablet, or laptop on the same Wi-Fi. Opens the survey page in the browser. No install — scan a QR code and go.
Controller (Optional)
UniFi or Omada — enriches every sample with the AP and signal each client is on. Skip it for GPS-only surveys.
Map your Wi-Fi. Stop guessing.
Self-hosted, local, and free. Your survey data stays on your LAN.
Download HollowMapFree — see the docs for the full walk-through.