I was a huge user of Mailbox as well. When they announced they were shutting down, I tried a bunch of different apps but found that Gmail Inbox was the best for me. They have a good mobile app (iOS and Android). Although they don't have a desktop app (yet), I've just had to pick my battles. Mailbox was the only app that was on all platforms, Mac OS, iOS, Android
I was a huge user of Mailbox as well. When they announced they were shutting down, I tried a bunch of different apps but found that Gmail Inbox was the best for me. They have a good mobile app (iOS and Android). Although they don't have a desktop app (yet), I've just had to pick my battles. Mailbox was the only app that was on all platforms, Mac OS, iOS, Android