Dead Pixel Test & OLED Burn-in

🔍 Dead pixel test, OLED burn-in check and touch screen test. Each takes about a minute.

Dead pixels do not announce themselves. They hide in a dark photo, on a white

web page, or in a corner you rarely look at. This app fills the screen with the

solid colours that make them show up, then lets you sweep every spot with a

finger to find touch areas that stopped responding.

■ Who this is for

· You just received a phone or tablet and want to check it before the return

window closes

· You are buying a used device and want to look at the screen properly

· Your screen was recently replaced and you want to know it was done right

· You need something to attach to a warranty or refund request

■ What it tests

🎨 Dead and stuck pixel test

Full screen red, green, blue, white, black, cyan, magenta and yellow.

A dead pixel stays black on every colour. A stuck pixel stays the same colour

on all of them. Tap to step through, or let the colours cycle on their own.

👆 Touch and multi-touch test

Draw across the whole screen. Any area that misses your finger stays blank,

so dead zones are easy to see. Also shows how many fingers your screen

actually tracks at once.

⬜ Screen burn-in and uniformity check

Grey, white and green fields make OLED burn-in, backlight bleed near the edges,

tinted corners and uneven patches visible. Works on LCD, OLED and AMOLED

screens, and is useful on second hand phones.

📐 Screen facts

Real resolution, the panel's own native size, every display mode it supports,

pixel density, calculated screen size and HDR support. A two second refresh

rate check counts the frames the screen actually draws and shows the result

next to the rate the system claims. Screens that lower their rate to save power

can read low, so treat a low figure as a reason to look closer, not as proof.

🚩 Mismatch flags

Some devices report one thing and do another. When the value the system reports

does not match what the hardware answers, it is marked in red rather than

quietly shown. Handy if a device was advertised with specifications you want

to check.

📋 Sensor list

Every sensor the device reports, with vendor, range, resolution and power draw.

Eleven common sensors are also checked against what the system declares, and

the ones that are missing are listed as missing, which is worth knowing on inexpensive

imports that are advertised with a gyroscope or compass they do not have.

🧠 Processor cores

Core types and top speeds, taken from the core ID codes the kernel lists for

each core rather than from the chip name the system reports. Compare them with

the chip the listing promised. Some devices do not allow this to be read.

🔋 Battery

Charge level and the condition the system reports. Design capacity and battery

health are shown only where the device makes those figures available, and many

phones do not.

📄 Save a report

Export what you found as a single file you can attach to a return request or

keep for your own records.

■ Good to know

· Free

· No account and no login

· The tests run entirely on your phone and work without a connection

· No ads on the three test screens. A dead pixel test is only honest if nothing

covers the screen, so the ads stay on the home, facts and sensor screens

· Asks you for no permissions at all - no location, no contacts, no camera, no

access to your files

· What the tests measure stays on your phone. The app reports anonymous counts of

which tests were run and how many items disagreed, never the readings

themselves and never your report

■ Honest limits

This app shows you what is there. It does not repair anything, because dead

pixels cannot be fixed by software. A stuck pixel sometimes recovers on its

own with time, and a colour cycle may help, but nothing is guaranteed.

Backlight bleed and colour accuracy need controlled lighting to judge fairly,

so treat those readings as a hint rather than a verdict.

Questions: [email protected]