Inbox has always been a rather odd beast. It is made by the very same people who still develop and run Gmail but isn't exactly replacing it. At least, not yet. Inbox by Gmail, as it is formally known, is instead aiming to replace the way we do emails. It might be a lofty goal, but not everyone uses Inbox. Those still use email traditionally and, more often than not, you also have to reply, traditionally. With Smart Replies, now available also on the Web, you can at least be, well, smart about it.