DeviTestViewing angle and gamma test
Find out whether your screen shows mid-tones correctly, and how much colors and brightness change when you look at it from an angle.
Gamma test
Step back and squint a little. Find the square where the center blends into the striped border — that number is your screen’s gamma.
Viewing angle test
Opens full-screen patterns. Tap to switch between gray, dark gray, color bars, skin tones and a fine checkerboard, then tilt the screen or move your head.
What gamma means
Gamma controls how bright the mid-tones look between black and white. The standard for computers, phones and the web is 2.2. A lower gamma makes images look flat and washed out; a higher gamma makes them dark and contrasty, with shadows hard to see. Run the test at your usual brightness, with the browser zoom at 100%.
Reading the viewing angle test
- IPS and OLED: colors and brightness stay almost the same even from a wide angle. A slight shift is normal.
- VA: good from the front, but dark grays brighten and lose detail from the side. Skin tones may change.
- TN: strong shifts. Colors can invert when you look from above or below — easy to see on the gray screens.
Tip: the fine checkerboard should look like a smooth gray from normal distance. Flickering, moving lines or a colored tint on it can point to a scaling problem or an aggressive sharpening setting on the monitor.