screen on me.

Screen awake timer

Open the web version to start.

This is a downloaded HTML file. Use the local preview or an HTTPS web address to start a screen lock.

Open local preview

The local preview must be running on this Mac. See the included readme if it isn’t available.

Just a moment…

screen on me

Screen tools

Simple tools for the screen in front of you.

Keep screen onTimer, calendar, images and web pages. Screen informationSee the screen and viewport values reported by your browser. Dead pixel testCheck your display for bright or dark dots on solid white, black, red, green and blue screens. Screen uniformityLook for uneven brightness, patches or image retention on white and gray screens. Backlight bleed checkUse a black screen to look for bright areas around the edges of your display. Gradient testInspect smooth grayscale and color gradients for visible bands or abrupt transitions. Black and white levelsCompare numbered near-black and near-white patches to see which shades you can distinguish. Sharpness testCheck fine checkerboards, lines and text for blur or uneven rendering. Screen lightTurn your screen into a solid color light with color presets, intensity and an optional timer. Touch testDraw across the screen to inspect touch continuity and try multiple fingers together. Screen size comparisonCompare the width, height and area of two displays by diagonal and aspect ratio. Screen rulerCalibrate against a known length and use your screen as an approximate ruler. Motion testWatch a moving shape and text to inspect visible trailing and uneven movement.

Sharpness test

Check fine checkerboards, lines and text for blur or uneven rendering.

Check fine checkerboards, lines and text for blur or uneven rendering.

Buy me a coffee

Move mode on · turn off to interact with the page

Display controls

Zoom

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

Add images

JPEG, PNG, WebP or GIF · 10 images, 20 MB each, 50 MB total. The last started set is stored in this browser without uploading.

Drag the handle to reorder. Keyboard: Space to pick up, ↑/↓ to move, Space to drop, Escape to cancel.

Embed URL

You can omit https://. Some sites block embedding or require sign-in that may not work here.

Duration

Minutes1–1,440

Running friend

Settings

Theme

Language

English 한국어 日本語简体中文

How to use Sharpness test

Keep your screen on when you need it.

For studying, cooking or keeping a reference in view, screen on me helps prevent your screen from sleeping without changing device settings.

Choose a mode and duration, then press Start.
In Timer mode, tap the center time to switch remaining/current time. Calendar mode shows this month and the local clock.
Keep this page visible. Switching tabs releases the lock; return before the timer ends to resume.
Stop ends a timer. Back ends an image or web session.

TimerCount down for a set time or keep the screen on without a time limit.
Calendar + clockSee the current time and this month at a glance.
ImageKeep photos or reference pages in view and move between them.
Web pageDisplay an embeddable page such as a dashboard.

Keep this page visible. Check the status if the browser releases screen keeping.

Black backgrounds may reduce display power on some screens. Keeping the screen awake still uses battery.

Add to your home screen

Installation is optional. It does not override battery or device settings.

Check fine checkerboards, lines and text for blur or uneven rendering.

Choose a grid, vertical lines or text. For grids and lines, choose a size from 1, 2, 4, 6, 8 or 10 buffer pixels.
Select Start fullscreen. The preview does not keep the screen awake.
Compare fine and thick patterns for blur, uneven lines or hard-to-read text. Browser scaling can affect the appearance.
Hide the controls to see the whole pattern. Tap the screen to restore them, then select Finish to exit.

Compare fine patterns and text. The line size is in drawing-buffer pixels, not guaranteed physical display pixels. Browser zoom, scaling and rendering limits can affect the pattern. This is not a calibrated resolution measurement.