How can we test performance of a mobile application(both android and IOS)

I need to test the performance of a mobile application.
I have used jmeter tool to test it's services and APIs, but we want to test it's performance in device as well. is there any tool using which we can test the performance of a mobile application.

A single open source tool which can help with both applications i.e. android and IOS is preferred.

If there is any another way, with which we can test the performance of a application is also welcome.