Anybody know of one and if they can help before flying in a bad area?

I am interested in the same thing. Would prefer a hardware device, though. Something that could detect the signal strength and channel/frequency of what is around.

We have been having such terrible issues with signal quality since upgrading to recent firmwares. Something like this would at least rule out any legitimate outside interference. (I know the DJI app is warning that there is a lot of interference, but I do not believe that is accurate or true.)

If there was an App, I am not sure the phone has the ability to do this function without hardware attached?

They have Frequency scanners out there but not sure if this would really help much

Rich