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Wifi Analyzer is a good place to start.

https://play.google.com/store/apps/details?id=com.farproc.wi...

On macOS, someone below recommended "WiFi Signal", USD 5.

Not so fully featured, I assume, but free is Wireless Diagnostics. Ignore the popup, and go to Windows -> Info/Scan/Performance (it's in System -> Library -> CoreServices -> Applications, but I start it via Spotlight)

> Not so fully featured, I assume, but free is Wireless Diagnostics. Ignore the popup, and go to Windows -> Info/Scan/Performance (it's in System -> Library -> CoreServices -> Applications, but I start it via Spotlight)

Protip: it's also easily accessible by holding Option and clicking on the Wifi icon in the menu bar.

Fing for services and ping?

That's at least one OSI layer north of what was being asked.

It really depends on your Operating System.