Starting right away this morning you'll find that Inbox by Gmail invites are being sent out to the masses. If you'd been on the wait list, you might very well be in right this minute. If not, you'll be invited very, very soon. This goes for Android and iOS users as the invites are not OS-centric. Inbox is a setup that works cross-platform, be it on your web browser or your iPad, your Android tablet or your Android smartphone the same.