WiFi Analyzer Guide: Find the Best Channel for Your Router
A WiFi analyzer is a small app that shows every wireless network around you, what channel each one is on, and how strong each signal is. Used properly, it can fix slow WiFi without spending a rupee on new hardware.
Some sources don't show up in WiFi analyzers but still cripple performance: microwaves (2.4 GHz), USB 3 hubs leaking RF (2.4 GHz), poorly-shielded HDMI cables, and certain LED light fixtures. If your WiFi mysteriously dies at the same time every day, look for a device that turns on at that time.
On this page
- The Wi-Fi analyzer apps actually worth using
- How to pick a less crowded channel
- Making sense of the signal strength number
- Sources of interference you wouldn't think of
Key points
- Android: "WiFi Analyzer" by farproc. Free, no ads.
- iOS: Apple restricts WiFi APIs, so the best option is Airport Utility from the App Store with WiFi scanning enabled in iOS Settings.
- Windows: WiFi Analyzer in the Microsoft Store.
- macOS: Wireless Diagnostics (built-in, hold Option and click the WiFi icon).
- Stand near the router with the analyzer open.
- Look at the 2.4 GHz channel graph. Use channel 1, 6, or 11, whichever has the fewest overlapping networks.
- On 5 GHz, look for any channel that doesn't overlap with strong neighbors. The 5 GHz band is wider, so this is usually easy.
- Log in to the router admin page and set the channel manually instead of leaving it on "Auto".
- Reboot the router and run a WiFi speed test to confirm the change.
- Above -50 dBm: excellent, near-router speed.
- -50 to -65 dBm: good, full speed for most plans.
- -65 to -75 dBm: usable, expect ~50% of plan.
- Below -75 dBm: poor; consider repositioning the router or adding a mesh node.
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