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I am wondering, whether there is an app for the iPhone that can actually display the received signal strength of the RF signal carrying Wi-Fi data. I so far only have found ones that measure data transmission speeds, which can depend on several additional factors.
iPhone 12 Pro, iOS 14
Apple does provide the AirPort Utility app on their iPhones. Although this app was designed to managed Apple AirPort base stations it also includes a "Wi-Fi Scanner" that can be used with any wireless network to measure signal quality.
Note that it is not enabled by default in the app. Instead, tap on Settings > AirPort Utility > Wi-Fi Scanner (enable)
Once enabled, you should now see "Wi-Fi Scan" in the upper right-hand corner of the app. Tap on this, and then, tap on "Scan." After a few moments you should start seeing a list of nearby wireless networks with their RSSI values in dBm. Tap on "Stop" when you want to stop scanning, and then, "Done" when finished. Don't forget to disable this feature in Settings to conserve your phone's battery life.
Apple does provide the AirPort Utility app on their iPhones. Although this app was designed to managed Apple AirPort base stations it also includes a "Wi-Fi Scanner" that can be used with any wireless network to measure signal quality.
Note that it is not enabled by default in the app. Instead, tap on Settings > AirPort Utility > Wi-Fi Scanner (enable)
Once enabled, you should now see "Wi-Fi Scan" in the upper right-hand corner of the app. Tap on this, and then, tap on "Scan." After a few moments you should start seeing a list of nearby wireless networks with their RSSI values in dBm. Tap on "Stop" when you want to stop scanning, and then, "Done" when finished. Don't forget to disable this feature in Settings to conserve your phone's battery life.
The best place to ask about iPhone Apps would probably be in the iPhone Support forum, which is linked below:
How to measure Wi-Fi signal strength in db with iPhone
