As of recent the companion app for Black Desert Online was released to the public for iOS and Android.
In order to have a pleasant experience when launching the app you’ll need to select PC as your platform within the app, and then select your region: either NA or EU. Next, you just have to log in and you’re all set to get going. The app contains several useful features like an FAQ containing some of the most common community questions.
You can also redeem coupons using the Black Desert+ app. You just need to enter the coupon code in addition to the region to redeem. You can also customize your notifications like announcements, updates, events, Pearl Shop, and more.
One last major thing to note is the Guild system for the app. You will be able to talk to all of your guild members while on the go and it will also alert you of world boss events.