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Castro: Android system info and device status monitor

By Hafiz Rahman

Editor, tools and utilities

CPU and GPU statistics with live usage readings
Battery, memory and temperature monitoring
Wi-Fi and mobile data usage counters
Sensor readings shown on live graphs
Audio and video codec list, with DRM and Bluetooth details
Screen tester, noise checker and a data export option

What Castro is for

Castro is a system information app for Android. It gathers details about the hardware and software state of a phone or tablet and shows them in one place, so you can see how the device is actually behaving.

It suits people who want to look past the basic settings screen. That includes anyone checking why a device runs hot, drains quickly, or stutters, and anyone who wants to confirm what a camera, codec or wireless chip supports.

Hardware and software details

Castro breaks down the processor and graphics chip, showing CPU and GPU statistics. Camera details cover each lens the device exposes. A full list of audio and video codecs shows which formats the device can decode and encode.

The app also reports DRM support and Bluetooth information. These sections are for checking capabilities, not for changing them.

Live monitoring of battery, memory and network

Battery monitoring tracks charge and drain. Memory views show how much each kind of memory is in use. Network counters measure data used over Wi-Fi and over mobile connections separately.

Temperature readings come from the device's sensors, and the sensor section plots live values on graphs. The Dashboard screen gathers the most important figures in one window: CPU usage, battery status, network usage and memory load. It is the quickest way to get a snapshot without opening each detailed page.

Built-in checks and sharing device info

The Screen tester checks the display. The Noise checker measures ambient sound around you. Both are standalone tools inside the app rather than separate downloads.

Data export lets you share your device information, which is useful when you need to send specs to someone else, such as a support contact or a seller.