It works, but... – FINAL FANTASY XIV Companion Review

...it’s extremely lackluster. You can chat, you can see your items, and you can sell or adjust the price on listed items, the latter of which an extremely limited number of times per day. It’s a companion app in name only. You can’t manage your retainers and you can’t manage your squadron, making it utterly useless for anything meaningful. It has potential to be good, but it needs an overhaul and Square needs to take notes from other MMO companion apps out there.
Review by The Real Kman on FINAL FANTASY XIV Companion.