The RSSI Viewer app is a cross-platform tool that shows dBm per frequency in the 2.4 GHz range. It scans the 2400-2480 MHz range, records signal level on the Bluetooth® Low Energy channel frequencies, and presents the results.
You can use the tool with a sniffer device to look for interferers, check how channels are used, and to tweak settings like sweep delay and animation duration.
Note
The RSSI Viewer app is deprecated and no longer supported.