Best free app for tracking portfolios (not for tax)

I know this has been asked many times before and I've just been through a lot of those posts from the last few years. But I still haven't really found the perfect solution.

A lot of people said Coingecko but unless I'm blind, you have to manually add each purchase to track it. I'm looking for an app where you can add the addresses or API keys.

Other people said Accointing and so I downloaded that, and then fiddled about adding APIs for two exchanges, only to find that smaller exchanges aren't supported, so you have to do it manually (nope). Then I also found that when I added one BTC address from my Trezor, it only shows the value from that specific receiving address. I know that seems obvious but I'm sure I read somewhere that there are apps that will be able to show the total of a wallet from only one of the addresses.

Side note. I think I'm still confused by the definition of addresses. Is there a difference between a receiving address and a public address? As in, do you have one public address (per wallet and network) even if you used several receiving addresses?

TDLR: Looking for a free app to track portfolio values which supports most exchanges and can read total wallet values from a single address