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Charging wattage

I don't think so, not an app on its own. But you can get an inexpensive USB meter that plugs in line with the charger. that usually measure amps, watts, and volts.
 
I want to check how and when the quick charge is really working. I think my charging speed isn't really that fast.

What phone do you have?

Not all phones allow apps to read the phone's power profile. For example no app can work on my Vivo phone because they can't read the charging current value from the phone.
 
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