Ext Ops Panel
Open the app

Subject Line Ruler by Loop

Chrome extension by simo · Productivity · Workflow

A Chrome extension in Productivity · Workflow with 325 users, barely installed.

Specific sites only: 1 match pattern.

What the developer says, and 2 screenshots

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

Users
325
Rating
5.0 (7 ratings)
Users, last 15 days
+10
Rating, last 30 days
Not watched long enough to say
Version
1.5
Updated in the store
2025-03-20
Published
2023-10-02
Manifest
V3
Browser access
2 permissions, 1 site pattern

How it has moved

Users
+10 since 01.09
315-326 · 7 readings
  1. 2026-09-01315
  2. 2026-09-04321
  3. 2026-09-06322
  4. 2026-09-08325
  5. 2026-09-09324
  6. 2026-09-13326
  7. 2026-09-15325
Rating
unchanged since 01.09
reviewsrating 5.00 · 7 readings
  1. 2026-09-01reviews7rating5.00
  2. 2026-09-04reviews7rating5.00
  3. 2026-09-06reviews7rating5.00
  4. 2026-09-08reviews7rating5.00
  5. 2026-09-09reviews7rating5.00
  6. 2026-09-13reviews7rating5.00
  7. 2026-09-15reviews7rating5.00
Users
+10 since 01.09
315-326 · 7 readings
  1. 2026-09-01315
  2. 2026-09-04321
  3. 2026-09-06322
  4. 2026-09-08325
  5. 2026-09-09324
  6. 2026-09-13326
  7. 2026-09-15325
Rating
unchanged since 01.09
reviewsrating 5.00 · 7 readings
  1. 2026-09-01reviews7rating5.00
  2. 2026-09-04reviews7rating5.00
  3. 2026-09-06reviews7rating5.00
  4. 2026-09-08reviews7rating5.00
  5. 2026-09-09reviews7rating5.00
  6. 2026-09-13reviews7rating5.00
  7. 2026-09-15reviews7rating5.00

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

Specific sites only: 1 match pattern.

  • https://*.klaviyo.com/*
  • 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

simo publishes 2 listings we track, 554 users between them. Listed website: loopsrl.agency.

  1. Extra Klaviyo Data by Loop simo · Make Chrome Yours · Functionality · published 2024-04-16 229 users ★ 5.0

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. Designer Tools Legacy Describes nearly the same job, smaller audience 1 user
  3. Yi Page Ruler Pro Describes nearly the same job, smaller audience 20 users
  4. ColorPik & Measure Describes nearly the same job, smaller audience 4 users
  5. Simple Ruler Describes nearly the same job, smaller audience 7k users ★ 4.4

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?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

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.