Screen Test: Diagnostic Tool

stargazer apps

About this app

Screen Test started as a screen checker — now it's a complete device diagnostic app. Before buying a used phone, selling your old one, or just to make sure everything still works, run a full hardware and screen test in minutes.

WHAT YOU CAN TEST

Display & Pixels
Find dead, stuck or bright pixels and check panel uniformity with solid colors, gradients (RGB rainbow, grayscale, OLED black, neon, radial), sharpness patterns and a color distance tool.

Touch Screen
Multi-touch grid test to find unresponsive zones or ghost touches.

Audio & Speakers
Test left/right channels and the vibration (haptics) motor.

Sensors & Motion
Check accelerometer, gyroscope, proximity, light and other sensors.

Camera & Flash
Test front and back lenses, zoom levels and the flash.

Refresh Rate
Measure your screen's real refresh rate (FPS) and smoothness.

Battery & System Specs
View battery health and full hardware/system information.

CPU, GPU & Thermal
Check core count, run a GPU/3D stress test, and monitor thermal throttling.

FULL DIAGNOSTIC REPORT
Run the tests once and generate a complete, shareable PDF diagnostic report — perfect for second-hand phone deals, warranty claims, or checking a device after repair.

Lightweight, fast and easy to use, with no technical knowledge required. Screen Test helps you catch hidden display and hardware issues before they become a real problem.

What’s new

• Target Android 16 (API 36) update with enhanced stability and performance.
• Full hardware & display diagnostic suite: Screen, Touch, Audio, Sensors, Camera, Battery & Thermal tests.
• Comprehensive PDF Diagnostic Report generation with defect marking.
• Cleaner UI, updated module badges, and UX refinements.
• Bug fixes and battery efficiency optimizations.