Bio Lite is a virtual fingerprint reader for your iPhone4/5/5c/5s or iPad on your lockscreen. A simple hold on the “Fingerprint Reader”, while a scan animation occurs, will unlock your device. This is the free version and only comes with an on/off switch.
The Paid version "Bio" comes with several options to make this tweak realistic and customizable. For example you can add a custom secret step(s) before the scan to prevent others from unlocking. And for a personalized touch, the scanner itself can be changed to any image from your photo library.
Bio Lite is iOS7+ and arm64 compatible.