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: Reddit / 27 days ago
Delta - Delta is the ultimate cryptocurrency portfolio management tool.
ExchangeRates.Pro - Real-time Bitcoin & Crypto price comparison: find the best rates to buy, sell, exchange 34 cryptocurrencies and 152 fiat currencies! Exchanges, Brokers, P2P Markets in 255 countries
Cosmo - Crypto portfolio manager with exchange syncing
Crypto Tracker - Never miss an opportunity to invest in bitcoins & ether
Crypto Central - Bitcoin & cryptocurrency portfolio tracker 💸
500 Coins - A forever changing list of the Top 500 Cryptocurrencies