How to Map Your WiFi with HeatFi

HeatFi is available exclusively on the App Store for iPhone and iPad. It requires iOS 16.0 or later. Download is free — no account required to get started.

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  Download from the App Store Search "HeatFi" or tap the link below. The app is free to download.
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  Allow Location & WiFi permissions HeatFi needs location access to correlate your position with signal readings as you walk around your space.
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  Optional: Enable notifications Get notified when your export is ready or a scan session completes in the background.

Each project represents a physical space — an office floor, an apartment, a warehouse, etc. You can have as many projects as you like.

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  Tap "New Project" on the home screen Give your project a descriptive name like "Home – 2nd Floor" or "Office Building A".
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  Enter the approximate area size This helps HeatFi scale your floor plan correctly and calibrate scan density recommendations.

A floor plan is the canvas your heatmap is drawn on. HeatFi gives you two flexible options:

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  Import an image Upload a PNG, JPG, or PDF floor plan from your Files app or Photos. Works great with architectural drawings or office layouts.
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  Draw your own Use the built-in drawing tool to sketch rooms, walls, and corridors directly in the app. No design experience needed.

This is where the magic happens. HeatFi measures WiFi signal strength (RSSI) as you walk around, then pins each reading to your position on the map.

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  Tap "Start Scan" HeatFi will begin capturing signal readings automatically. Keep your iPhone in your hand at a natural height.
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  Walk slowly and systematically Move in a grid pattern — row by row — for the most uniform coverage. Pause briefly in corners and dead zones.
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  Tap your position on the map as you walk Tap the floor plan to tell HeatFi where you are. The more location pins you drop, the more accurate your heatmap will be.
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  Tap "Stop Scan" when done HeatFi will immediately generate your heatmap from the collected readings.

HeatFi visualizes signal strength using a color gradient overlaid on your floor plan. Here's how to interpret it:

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  Green — Excellent signal (–30 to –60 dBm) Fast, reliable connection. Ideal for video calls, large file transfers, and latency-sensitive tasks.
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  Yellow — Good signal (–60 to –70 dBm) Usable for most tasks. Streaming and browsing will work fine. May see occasional slowdowns.
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  Orange — Weak signal (–70 to –80 dBm) Basic connectivity only. Consider moving your router or adding a WiFi extender in this area.
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  Red — Poor or no signal (below –80 dBm) Dead zone. Devices will frequently disconnect here. A repeater or mesh node is strongly recommended.

HeatFi lets you export your heatmap as a high-resolution PDF or image — ready to share with clients, IT teams, or landlords.

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  Tap the Share button in the top-right corner Choose between PDF report (with summary stats) or a PNG image of your heatmap.
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  Share via AirDrop, Mail, or any app Use the standard iOS share sheet to send your report anywhere.
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  Save to Files for later Store your heatmap in iCloud Drive or on-device for future reference or comparison scans.