Im using blockfolio,its smooth and easy to use to monitor the price of the coins you are holding. Another app im using is the tab trader app , you can put the api key of the exchange you want to trade smooth on this app , makes my trading fast and easy. Im also using Kucoin app exchanger , its more friendly user than their website , its fast flawless and easy to use also. Im also using   telegram app because i use to join some Ico group and its so useful because you can talk to the team and developer of the project.