Not really, unless you’re flying something expensive with TCAS.
ADS-B can be picked up by all typical iPad accessories nowadays.
It was a question of preventing that kind of near misses, or near hits 
??
In Norway, except in more desolate places, such things are prevented simply by transponder and ATC (information). Won’t help you much at ENOP for instance, but all along the TMAs at the coast, there is nothing ADSB would do better. At ENOP and 3-4 other places with high density GA, it you would be much better of with FLARM in any case. Remember, gliders have right of way.
