After testing it appears this app doesn’t really work as advertised and you’re better off just buying one of these:
I didn’t know this existed until now This is just an FYI post as I just learned about it but I definitely plan on digging deeper into this app. That being said if you think your phone charger sucks or maybe your cable sucks this app can give you some real data to backup your intuitions and make changes appropriately. I just plugged in two different cables into my charger and my laptop with my phone and I was surprised to see the differences. Even between different usb ports on the same laptop! And best yet it’s free!