How would I run a frequency sweep on Android? (Headphones)

I'm looking for an app that will run frequencies and tell me what's also going on using my ears instead of a microphone, however I'd need to know what frequency is playing and it'd be nice to have allot of frequency sweeps avaiable.
Really, I'm just trying to go down an EQ rabbit hole here and can't quite find a good app to do this on Android. On PC sure but all I really have is a really good DAP so I'd like to just do it on Android.
 
I use an app called 'function generator' by keuwlsoft on android.
It's useful for outputting a particular frequency when I am setting up an amp away from my sig gen.
It does have a basic sweep function on there, so it might do what you want too.
 
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