I would never put all of the keys to the kingdom in one place, which is the only time Greplin becomes useful. Your e-mail inbox is, quite literally, a skeleton

I would never put all of the keys to the kingdom in one place, which is the only time Greplin becomes useful. Your e-mail inbox is, quite literally, a skeleton key to your entire online identity, and by extension, a great part of your life, and there's no way that I'm handing that over to someone to get GMail searches that finish a fraction of a second faster. (Seriously, search your inbox for 'password' at some point. You'd be amazed how many plaintext passwords, or good-forever recovery URLs are sitting there. Just the knowledge of what accounts someone has is an absolute goldmine for nefarious people. I sincerely hope the Greplin people have invested significant, meaningful effort into security and have someone who lives and breathes it, because a single exposure would evaporate them overnight.)