TapN (com.t3hh4xx0r.tapn) on Google Play
TapN is a new way to use NFC. TapN allows you to "log in" to any app on your Android device with a simple NFC tap. No more passwords, no more password managers, just simply tap and go.The app comes free for one week. During this week you are limited to saving only one identity at a time. You can unlock the one week trial limit, and the one identity limit by purchasing the in app purchase, or acquiring a verification code from the developer.