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r12: grid overlay & layout inspector

Chrome extension by r12 · Productivity · Developer

  • Featured
  • Established publisher

A Chrome extension in Productivity · Developer with 90 users, barely installed. Audience over the last 30 days: +12.

No site access is declared in the manifest, so it cannot read the pages you open on its own.

What the developer says, and 5 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
90
Rating
not rated yet
Users, last 30 days
+12
Version
0.2.4
Updated in the store
2026-01-25
Published
2025-11-16
Manifest
V3
Browser access
3 permissions

How it has moved

Users
+12 since 02.10
72-90 · 15 readings
  1. 2026-10-0473
  2. 2026-10-0872
  3. 2026-10-0979
  4. 2026-10-1080
  5. 2026-10-1386
  6. 2026-10-1689
  7. 2026-10-1888
  8. 2026-10-1986
  9. 2026-10-2187
  10. 2026-10-2283
  11. 2026-10-2387
  12. 2026-10-2484
  13. 2026-10-2586
  14. 2026-10-2990
  15. 2026-10-3190
Users
+27 since 01.09
63-90 · 30 readings
  1. 2026-09-0163
  2. 2026-09-0365
  3. 2026-09-0466
  4. 2026-09-0670
  5. 2026-09-0769
  6. 2026-09-0967
  7. 2026-09-1072
  8. 2026-09-1376
  9. 2026-09-1575
  10. 2026-09-1773
  11. 2026-09-2076
  12. 2026-09-2274
  13. 2026-09-2578
  14. 2026-09-2680
  15. 2026-09-2878
  16. 2026-10-0473
  17. 2026-10-0872
  18. 2026-10-0979
  19. 2026-10-1080
  20. 2026-10-1386
  21. 2026-10-1689
  22. 2026-10-1888
  23. 2026-10-1986
  24. 2026-10-2187
  25. 2026-10-2283
  26. 2026-10-2387
  27. 2026-10-2484
  28. 2026-10-2586
  29. 2026-10-2990
  30. 2026-10-3190

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.

  • Run its own code on the pages it can access scripting
  • Act on the current tab, but only after you click it activeTab
  • Store data in your browser storage

The full permission history for this extension

What changed recently

Nothing has moved on this listing since we started watching it.

The publisher

r12. Listed website: r12.io.

Like this one

Listings the catalog judges closest in what they say they do.

  1. CSS Grid Overlay Describes nearly the same job, smaller audience 292 users ★ 5.0
  2. Grid Overlay Pro Describes nearly the same job, smaller audience 441 users ★ 5.0
  3. Grid Overlay Describes nearly the same job, smaller audience 67 users
  4. Yi Page Ruler Pro Describes nearly the same job, smaller audience 19 users
  5. Grid Tool — Ruler & Guides Describes nearly the same job, smaller audience 80 users ★ 5.0

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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Users and rating on Ext Ops Panel

Markdown

[![Users and rating on Ext Ops Panel](https://extops.dev/extensions/pnbjngfpegnppollmgppkdlfdbgchlon/badge.svg)](https://extops.dev/extensions/pnbjngfpegnppollmgppkdlfdbgchlon)

HTML

<a href="https://extops.dev/extensions/pnbjngfpegnppollmgppkdlfdbgchlon"><img src="https://extops.dev/extensions/pnbjngfpegnppollmgppkdlfdbgchlon/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 2026-10-29. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built