QA Authenticator is a simple and free open source app. It works as a code generator for two stage authorisation process. It is set up in a way to work with big companies like Facebook or Google. It is an additional layer of security for your online log-in accounts.
In addition to other apps QA Authenticator secures your generated code with PIN code.
To set it up you scan QR code in your selected profile with camera or you enter code manually. After added it will appear in the app on the main Account screen. In order to open it you are required to enter PIN code.

Requires iOS 8.2 or later.