Ext Ops Panel
Open dashboard

Histrix Calculator

Chrome Web Store listing by JFMDev

A Chrome extension with 139 users, barely installed. Audience over the last 30 days: +2.

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
139
Rating
4.0 (3 ratings)
Users, last 30 days
+2
Rating, last 30 days
Steady over 30 days
Version
1.1
Updated in the store
2014-03-27
Published
2014-02-05
Manifest
V2
Browser access
No permissions declared

How it has moved

Users
+2 since 02.10
134-155 · 15 readings
  1. 2026-10-04143
  2. 2026-10-08149
  3. 2026-10-09145
  4. 2026-10-10146
  5. 2026-10-13137
  6. 2026-10-16138
  7. 2026-10-18145
  8. 2026-10-19146
  9. 2026-10-21147
  10. 2026-10-22155
  11. 2026-10-23143
  12. 2026-10-24138
  13. 2026-10-27134
  14. 2026-10-29138
  15. 2026-11-01139
Rating
unchanged since 02.10
reviewsrating 4.00 · 15 readings
  1. 2026-10-04reviews3rating4.00
  2. 2026-10-08reviews3rating4.00
  3. 2026-10-09reviews3rating4.00
  4. 2026-10-10reviews3rating4.00
  5. 2026-10-13reviews3rating4.00
  6. 2026-10-16reviews3rating4.00
  7. 2026-10-18reviews3rating4.00
  8. 2026-10-19reviews3rating4.00
  9. 2026-10-21reviews3rating4.00
  10. 2026-10-22reviews3rating4.00
  11. 2026-10-23reviews3rating4.00
  12. 2026-10-24reviews3rating4.00
  13. 2026-10-27reviews3rating4.00
  14. 2026-10-29reviews3rating4.00
  15. 2026-11-01reviews3rating4.00
Users
-4 since 31.08
134-155 · 26 readings
  1. 2026-08-31143
  2. 2026-09-04148
  3. 2026-09-05146
  4. 2026-09-07146
  5. 2026-09-09148
  6. 2026-09-13142
  7. 2026-09-15144
  8. 2026-09-21147
  9. 2026-09-25141
  10. 2026-09-27135
  11. 2026-09-28137
  12. 2026-10-04143
  13. 2026-10-08149
  14. 2026-10-09145
  15. 2026-10-10146
  16. 2026-10-13137
  17. 2026-10-16138
  18. 2026-10-18145
  19. 2026-10-19146
  20. 2026-10-21147
  21. 2026-10-22155
  22. 2026-10-23143
  23. 2026-10-24138
  24. 2026-10-27134
  25. 2026-10-29138
  26. 2026-11-01139
Rating
unchanged since 31.08
reviewsrating 4.00 · 26 readings
  1. 2026-08-31reviews3rating4.00
  2. 2026-09-04reviews3rating4.00
  3. 2026-09-05reviews3rating4.00
  4. 2026-09-07reviews3rating4.00
  5. 2026-09-09reviews3rating4.00
  6. 2026-09-13reviews3rating4.00
  7. 2026-09-15reviews3rating4.00
  8. 2026-09-21reviews3rating4.00
  9. 2026-09-25reviews3rating4.00
  10. 2026-09-27reviews3rating4.00
  11. 2026-09-28reviews3rating4.00
  12. 2026-10-04reviews3rating4.00
  13. 2026-10-08reviews3rating4.00
  14. 2026-10-09reviews3rating4.00
  15. 2026-10-10reviews3rating4.00
  16. 2026-10-13reviews3rating4.00
  17. 2026-10-16reviews3rating4.00
  18. 2026-10-18reviews3rating4.00
  19. 2026-10-19reviews3rating4.00
  20. 2026-10-21reviews3rating4.00
  21. 2026-10-22reviews3rating4.00
  22. 2026-10-23reviews3rating4.00
  23. 2026-10-24reviews3rating4.00
  24. 2026-10-27reviews3rating4.00
  25. 2026-10-29reviews3rating4.00
  26. 2026-11-01reviews3rating4.00

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

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.

The full permission history for this extension

What changed recently

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

The publisher

JFMDev publishes 6 listings we track, 770 users between them.

  1. Landscape Jigsaw Puzzles JFMDev · published 2014-02-05 298 users ★ 2.2
  2. Landscape Sliding Puzzles JFMDev · published 2014-02-05 208 users ★ 4.8
  3. Flappy Clone JFMDev · published 2014-03-27 119 users ★ 4.0
Show 2 more from this publisher
  1. Levenshtein Challenge JFMDev · published 2015-10-30 3 users
  2. Chrome Extension Popurri JFMDev · Productivity · Developer · published 2021-06-12 3 users

Like this one

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

  1. iOS Calculator Describes nearly the same job, smaller audience 3 users (last published figure)
  2. PocketCalc — Mini Calculator Describes nearly the same job, smaller audience 30 users
  3. Calculator (iOS Inspired) Describes nearly the same job, smaller audience 64 users
  4. Calculadora Describes nearly the same job, smaller audience 6 users
  5. Calculator Describes nearly the same job, with a large installed audience 200k users ★ 3.8

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.

Want this mark on your extension in our catalog?

Verify that you are its author and you can show this mark on the card, with live banners for your site and README. How verification works

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

Connect it in a minute See what the panel does
Add a badge to your README or site

The badge shows the audience and rating from our last pass over the store and links back to this page.

Users and rating on Ext Ops Panel

Markdown

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

HTML

<a href="https://extops.dev/extensions/lgdfflejppjaglpjmkigldlpmkhfppcc"><img src="https://extops.dev/extensions/lgdfflejppjaglpjmkigldlpmkhfppcc/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 2026-11-01. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built