If you store all your coins in a single wallet, such as exodus, then that's the easiest way to keep track. If your coins are split across different wallets and exchanges though, I use this on windows and it seems to be available on mac as well - you just manually enter your hold and it updates prices every few seconds :). Source: about 3 years ago

I see there's a lot of competition in the area, is there a comprehensive list with comparisons somewhere? Google searches suggest https://cryptoradar.co. Source: over 2 years ago

In terms of comparing rates - coin gecko works pretty well. Apps like cryptoradar and cryptolens can be useful for helping break down the rates associated with each exchange aswell (a exchange might have a good rate, but charger a marker taker fee in the end). Source: about 3 years ago