Is there a mobile app?
No, there is no official mobile app.
Mining requires a lot of computational power unavailable to any modern smartphone or tablet yet. That is why there is no Kryptex app for Android or iOS.
You can track your PC's activity is available directly through the optimized website for mobile platforms. There is no need for a particular app to stay informed about your PC
You can use Kryptex exactly as an app by following this instruction.
It works the same way as an app!