screen on me

Screen awake timer

Just a moment…

screen on me

Screen tools

Simple tools for the screen in front of you.

Black and white levels

Compare numbered near-black and near-white patches to see which shades you can distinguish.

Compare numbered near-black and near-white patches to see which shades you can distinguish.

End this session?

Leaving this page will stop the timer and release the screen lock.

Start your session

Choose what to display and how long to keep it on.

Display
Duration
Running friend

Settings

Theme
Language

How to use Black and white levels

Compare numbered near-black and near-white patches to see which shades you can distinguish.

  1. Select Start fullscreen. The preview does not keep the screen awake.
  2. Compare the numbered patches near black at the top and near white at the bottom. The numbers are RGB values from 0 to 255.
  3. Check which neighboring patches you can distinguish. Change device brightness yourself if you want to compare settings.
  4. Hide the controls to see the whole pattern. Tap the screen to restore them, then select Finish to exit.

Compare neighboring patches at your usual viewing distance. Numbers show the RGB channel value from 0 to 255. This is a visual comparison, not a measured contrast ratio or calibration.