Screen Master - Dead Pixel Tester
Chrome extension by Tong Gu La · Productivity · Tools
A Chrome extension in Productivity · Tools with 23 users, barely installed. Audience over the last 30 days: +3.
No site access is declared in the manifest, so it cannot read the pages you open on its own.
What the developer says, and 3 screenshots
Loading from the Chrome Web Store. Open the listing if it does not appear.
- Users
- 23
- Users, last 30 days
- +3
- Version
- 1.0.0
- Updated in the store
- 2026-02-21
- Published
- 2026-02-21
- Manifest
- V3
- Browser access
- No permissions declared
How it has moved
- 2026-10-0419
- 2026-10-0921
- 2026-10-1123
- 2026-10-1325
- 2026-10-1727
- 2026-10-1829
- 2026-10-1925
- 2026-10-2027
- 2026-10-2126
- 2026-10-2225
- 2026-10-2426
- 2026-10-2524
- 2026-10-2921
- 2026-10-3023
- 2026-10-3123
- 2026-09-0118
- 2026-09-0221
- 2026-09-0419
- 2026-09-0521
- 2026-09-0618
- 2026-09-0816
- 2026-09-1014
- 2026-09-1317
- 2026-09-1518
- 2026-09-1719
- 2026-09-2024
- 2026-09-2123
- 2026-09-2522
- 2026-09-2620
- 2026-10-0419
- 2026-10-0921
- 2026-10-1123
- 2026-10-1325
- 2026-10-1727
- 2026-10-1829
- 2026-10-1925
- 2026-10-2027
- 2026-10-2126
- 2026-10-2225
- 2026-10-2426
- 2026-10-2524
- 2026-10-2921
- 2026-10-3023
- 2026-10-3123
A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing up to 2 times a day and record a point only when something moves. History beyond ninety days is in the app.
What it can reach
No site access is declared in the manifest, so it cannot read the pages you open on its own.
We have not read this listing's manifest since we started keeping permission names. The counts above come from the last time we did.
What changed recently
Nothing has moved on this listing since we started watching it.
The publisher
Tong Gu La. Listed website: screencheck.online.
Like this one
Listings the catalog judges closest in what they say they do.
-
Whitescreen: Display Test Tools 5 users
-
All Black Screen Test 3 users (last published figure)
-
Black Screen 366 users
-
AllColorScreen 24 users
-
ReColor 69 users
The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.
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The badge shows the audience and rating from our last pass over the store and links back to this page.
[](https://extops.dev/extensions/eliclbchlaphgnbhgceloldnjaiponbj)<a href="https://extops.dev/extensions/eliclbchlaphgnbhgceloldnjaiponbj"><img src="https://extops.dev/extensions/eliclbchlaphgnbhgceloldnjaiponbj/badge.svg" alt="Users and rating on Ext Ops Panel" height="20"></a>Figures come from our own regular passes over the public Chrome Web Store listing, last read on . The store last changed these figures on 2026-10-30. We publish no contact details for extension developers.