What is Phone Health Checker?
Phone Health Checker is an Android diagnostics app that gives users a complete picture of their device's health and performance. Most Android phones expose hardware sensor data and system metrics through standard APIs, but the information is scattered across settings menus and not presented in a way that's easy to understand. This app pulls all of that data together into a single dashboard with clear explanations of what each metric means and when it should be a concern.
Battery health is the central feature. The app reads battery capacity, charge cycle count, charging status, battery temperature, and the estimated health percentage. It tracks these values over time so users can see trends - a battery that was 95% health six months ago and is now 78% is showing a clear degradation curve. This kind of longitudinal data is not available in the default Android settings.
Beyond the battery, the app monitors CPU usage per core, RAM allocation, storage usage across internal and external storage, network connection quality, and the status of hardware sensors including the gyroscope, accelerometer, compass, barometer, and proximity sensor. A benchmark score gives users a single-number comparison point for overall device performance.
What it does
Battery health analysis
Reads battery capacity, estimated health percentage, charge cycle count, current temperature, charging voltage, and charging current. Tracks values over time to show degradation trends.
CPU and RAM monitoring
Shows usage percentage per CPU core, current clock speed, total and available RAM, and memory pressure indicators. Updates in real time while the app is open.
Storage analyser
Breaks down internal and external storage by category (apps, photos, videos, audio, documents, other). Shows available space and flags when storage is critically low.
Sensor health check
Tests all hardware sensors on the device: gyroscope, accelerometer, magnetometer (compass), barometer, proximity sensor, ambient light sensor, and fingerprint sensor. Reports whether each sensor is responding correctly.
Temperature monitoring
Reads CPU temperature, battery temperature, and where available, board temperature. Alerts the user when temperatures exceed safe operating ranges.
Network diagnostics
Tests current WiFi and mobile data connection speed, signal strength, ping latency, and DNS resolution time. Useful for distinguishing between device and network problems.
Device benchmark score
Runs a standardised CPU and memory benchmark to produce a single performance score. Users can compare their result against the platform average to understand how their device stacks up.
How it's built
Built natively for Android in Kotlin. Hardware sensor data is read through the Android SensorManager API. Battery information comes from BatteryManager and Intent.ACTION_BATTERY_CHANGED broadcasts. CPU and RAM data is read from /proc/stat, /proc/meminfo, and ActivityManager. Historical data is stored in a local Room database.