Measure your actual connection quality (download, upload, latency, jitter) directly in your browser — and create a signal heatmap of your home or office by walking around with this page open.
⚡ 100% client-side · nothing uploaded
Honest disclosure
Web browsers cannot read true WiFi signal strength (RSSI in dBm) for security reasons. This tool instead measures the real-world effects of your connection — actual download/upload speed, latency, and jitter — which are what determine whether your WiFi feels "good" or "bad" regardless of the raw signal number. For true RSSI scanning, use your OS's WiFi diagnostics (Windows netsh, macOS Wireless Diagnostics, Linux iwconfig). The heatmap part is manual — click anywhere on the floor to place a marker for the signal quality at that location.
1. Connection diagnostics
Connection
—
Download
—
Upload
—
Latency
—
Subjective quality (based on measured speed + latency)
Downlink (browser API)—
RTT (browser API)—
Connection type—
Effective type—
Save data—
From navigator.connection — values reflect the browser's last-known network estimate and may be approximate.
2. Latency & jitter
Average latency—
Min / Max—
Jitter (std dev)—
Packets sent / received0 / 0
How this works: Sends 10 small HTTP requests to a public endpoint and measures round-trip time. Average + jitter + min/max are computed from the samples. Jitter above 30 ms usually indicates WiFi congestion or interference; above 100 ms indicates real connectivity issues. Download/upload use a small static file from jsdelivr.net — not a full speedtest, but enough to detect "is the connection actually slow".
3. Signal heatmap
click anywhere on the floor to drop a marker for that location
Mark this spot:
ExcellentGoodFairWeakDead
Click on the floor below to mark signal quality at that location.
Walk around your home or office with this page open and click at each spot.
How to use:
1) Click Capture this spot (or simply click on the floor). 2) Move to another room or spot. 3) Repeat. The marker shows your subjective signal quality at that location — based on whatever test you ran. For best results, run the speed test at each location before marking.