If you are waiting for Google to release Inbox as Chrome app you may be waiting a long time. If you are an OS X user then chenasraf has you covered.
gInbox is a wrapper made for Mac around Inbox by Google. It is designed to eliminate the need of using a tab in Chrome.
At the moment it acts as a windowed-tab but unlike Chrome apps it will not be eliminated when you close the window, forcing you to reopen the address. It stays in the background as a normal OS X app would.
In future versions the dev is hoping to add:
- OS X Notifications for new email
- Muting Hangouts messages in window
- Opening Messages.app instead of Hangouts
- OS X themes
Download the latest vesion from here.