Whatsapp - This is the main communication app for Brazilians. We use a lot with friends and with family. Some use Telegram too, but Whatsapp is the most famous here.
Uber - Nowadays the price is a little high, but I particularly use a lot to go to some places. Some use 99 Pop, but, again, Uber is the most famous here.
iFood - After Uber Eats ended it's food operations here, iFood became the principal food delivery app here.