Evan J Zimmerman
Evan J Zimmerman reviewedCryptoLadderA real-time ranking of 500+ cryptocurrencies
 Recommended
Pros: 

Clean interface, fast data stream, lots of currencies

Cons: 

Needs better visuals for the expanded view. Specifically, more color and more charts

It's a fun app! Basically a better version of coinmarketcap.com. Best way to casually update yourself on the crypto market I've seen so far. There are other solutions but they're all slower and less visually appealing.