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OpenRuler

Chrome extension by PERENUS · Productivity · Tools

A Chrome extension in Productivity · Tools with 2 users, barely installed.

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

What the developer says, and 2 screenshots

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

Users
2 (the store no longer states an audience; this is the last figure it published)
Rating
not rated yet
Users, last 14 days
unchanged
Version
0.1.2
Updated in the store
2026-08-11
Published
2026-08-11
Manifest
V3
Browser access
2 permissions

How it has moved

Users
unchanged since 01.09
0-2 · 5 readings
  1. 2026-09-012
  2. 2026-09-030
  3. 2026-09-082
  4. 2026-09-090
  5. 2026-09-142
Users
unchanged since 01.09
0-2 · 5 readings
  1. 2026-09-012
  2. 2026-09-030
  3. 2026-09-082
  4. 2026-09-090
  5. 2026-09-142

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once 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

The full permission history for this extension

What changed recently

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

The publisher

PERENUS publishes 3 listings we track, 5 users between them.

  1. CellClip PERENUS · Productivity · Workflow · published 2026-08-14 3 users (last published figure)
  2. FormAnchor PERENUS · Productivity · Tools · published 2026-08-11 audience not published

Like this one

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

  1. Measure-it Describes nearly the same job, with an established audience 70k users ★ 3.5
  2. Page Ruler Describes nearly the same job, with a large installed audience 500k users ★ 3.9
  3. Simple Ruler Beta Describes nearly the same job, smaller audience 4k users ★ 2.8
  4. Measure Pixels on Screen Describes nearly the same job, smaller audience 11 users
  5. Page Ruler Pro Describes nearly the same job, smaller audience 18 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.

Is this your extension?

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Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.