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★★★★★
Outstanding Works perfectly, provides a great array of test patterns, and requires no special permissions. It even has brief descriptions of how to use each test pattern. I successfully used this app to calibrate my old Sony HD CRT, just hooked my phone up to the TV using an HDMI cable.
★★★★★
Great app Straightforward app. No permissions required. Doesn't ask you to purchase an upgraded app for tablets like others. Allows testing of the full screen including the soft button area. Can't believe this is free. I will continue to support this developer. Thanks :)
★★★★★
I wanted to see just how good my Note 4's 1440x2560 display was, I wanted to see if I could see the individual pixels. This app was perfect for that - it live renders vectors (meaning we're not using pre-made bitmaps here) of anything you want, whether it be checkerboard or vertical lines or moire pattern tests, at the maximum resolution of your device. The verdict? No, no I cannot see the individual pixels on a 520 pixel-per-inch screen.
★★☆☆☆
Needs an update to account for new screen design. For example, punch hole camera screens have a solid black bar at the top.
★★☆☆☆
Make Idol 3 strange behaviour like ghost touch and slow down phone while opening 1-3 pixels pattern test
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