This app is able to use front camera & rear camera of the phone at the same time. So you can take photos or record videos with the front camera & rear camera simultaneously.
There are four basic camera layouts to choose from.
You can freely drag the camera layout to change its position.
You can switch between front and rear cameras.
Known issue:
Some devices are prohibited from starting the front and rear cameras at the same time by the manufacturer. Therefore, there is no guarantee that this app will work on all devices.