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Subject Line Ruler by Loop

Chrome extension by simo · Productivity · Workflow

  • Established publisher

A Chrome extension in Productivity · Workflow with 335 users, barely installed. Audience over the last 30 days: +1.

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
335
Rating
5.0 (7 ratings)
Users, last 30 days
+1
Rating, last 30 days
Steady over 30 days
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
+1 since 01.10
330-346 · 17 readings
  1. 2026-10-05337
  2. 2026-10-08342
  3. 2026-10-09346
  4. 2026-10-10342
  5. 2026-10-13339
  6. 2026-10-16334
  7. 2026-10-17335
  8. 2026-10-18337
  9. 2026-10-19338
  10. 2026-10-21344
  11. 2026-10-22341
  12. 2026-10-23336
  13. 2026-10-24334
  14. 2026-10-25333
  15. 2026-10-27330
  16. 2026-10-29335
  17. 2026-10-31335
Rating
unchanged since 01.10
reviewsrating 5.00 · 17 readings
  1. 2026-10-05reviews7rating5.00
  2. 2026-10-08reviews7rating5.00
  3. 2026-10-09reviews7rating5.00
  4. 2026-10-10reviews7rating5.00
  5. 2026-10-13reviews7rating5.00
  6. 2026-10-16reviews7rating5.00
  7. 2026-10-17reviews7rating5.00
  8. 2026-10-18reviews7rating5.00
  9. 2026-10-19reviews7rating5.00
  10. 2026-10-21reviews7rating5.00
  11. 2026-10-22reviews7rating5.00
  12. 2026-10-23reviews7rating5.00
  13. 2026-10-24reviews7rating5.00
  14. 2026-10-25reviews7rating5.00
  15. 2026-10-27reviews7rating5.00
  16. 2026-10-29reviews7rating5.00
  17. 2026-10-31reviews7rating5.00
Users
+20 since 01.09
315-346 · 28 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
  8. 2026-09-17328
  9. 2026-09-20332
  10. 2026-09-25341
  11. 2026-09-26334
  12. 2026-10-05337
  13. 2026-10-08342
  14. 2026-10-09346
  15. 2026-10-10342
  16. 2026-10-13339
  17. 2026-10-16334
  18. 2026-10-17335
  19. 2026-10-18337
  20. 2026-10-19338
  21. 2026-10-21344
  22. 2026-10-22341
  23. 2026-10-23336
  24. 2026-10-24334
  25. 2026-10-25333
  26. 2026-10-27330
  27. 2026-10-29335
  28. 2026-10-31335
Rating
unchanged since 01.09
reviewsrating 5.00 · 28 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
  8. 2026-09-17reviews7rating5.00
  9. 2026-09-20reviews7rating5.00
  10. 2026-09-25reviews7rating5.00
  11. 2026-09-26reviews7rating5.00
  12. 2026-10-05reviews7rating5.00
  13. 2026-10-08reviews7rating5.00
  14. 2026-10-09reviews7rating5.00
  15. 2026-10-10reviews7rating5.00
  16. 2026-10-13reviews7rating5.00
  17. 2026-10-16reviews7rating5.00
  18. 2026-10-17reviews7rating5.00
  19. 2026-10-18reviews7rating5.00
  20. 2026-10-19reviews7rating5.00
  21. 2026-10-21reviews7rating5.00
  22. 2026-10-22reviews7rating5.00
  23. 2026-10-23reviews7rating5.00
  24. 2026-10-24reviews7rating5.00
  25. 2026-10-25reviews7rating5.00
  26. 2026-10-27reviews7rating5.00
  27. 2026-10-29reviews7rating5.00
  28. 2026-10-31reviews7rating5.00

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

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, 568 users between them. Listed website: loopsrl.agency.

  1. Extra Klaviyo Data by Loop simo · Make Chrome Yours · Functionality · published 2024-04-16 233 users ★ 5.0

Like this one

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

  1. Email Characters Describes nearly the same job, smaller audience 218 users ★ 3.0
  2. Subject Line Checker Describes nearly the same job, smaller audience 20 users ★ 5.0
  3. Unbury Subject Line Checker Describes nearly the same job, smaller audience 3 users (last published figure)
  4. Formatted Email Subject Lines by cloudHQ Describes nearly the same job, with an established audience 10k users ★ 4.5
  5. EmailSubjectScore Pro — Email Spam Risk & Subject Line Scorer for Gmail Describes nearly the same job, smaller audience 15 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/pcmeigfiadkneencdjihbaigklndhpfc/badge.svg)](https://extops.dev/extensions/pcmeigfiadkneencdjihbaigklndhpfc)

HTML

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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