There's no shortage of email apps out there. But Inky provides features that lay the groundwork for it to become a serious contender. The smartphone app promises to be a great organizational tool for multiple accounts, and makes it easy to sort out messages such as promotions. You can reply to messages with a “one-click” option that inserts standard phrases such as, “You forgot the attachment.” In some moments, however, the app seems to slow down just enough to be annoying. The app is free for a limited time on iOS devices.