Kane Cheshire has MacID (iTunes Link) for the iPhone, iPod Touch, iPad in the iTunes App Store for FREE (regularly $3.99) for a limited time.

MacID unlocks your Mac with just your fingerprint or passcode – without even unlocking your iOS device. MacID requires a Mac with Bluetooth LE (Low Energy) running OS X Yosemite or later, and an iOS device with Bluetooth LE running iOS 8 or later. MacID for iOS needs to be paired with the MacID for OS X companion app, which you must downloaded here for Free.