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Online Calculator

Chrome extension by JST EXPRESS CORP · Productivity · Tools

A Chrome extension in Productivity · Tools with 13 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 3 screenshots

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

Users
13
Rating
not rated yet
Users, last 30 days
+2
Version
1.0
Updated in the store
2025-10-11
Published
2025-10-11
Manifest
V3
Browser access
1 permission

How it has moved

Users
+2 since 02.10
11-15 · 11 readings
  1. 2026-10-0414
  2. 2026-10-0915
  3. 2026-10-1013
  4. 2026-10-1612
  5. 2026-10-1813
  6. 2026-10-2212
  7. 2026-10-2414
  8. 2026-10-2813
  9. 2026-10-2912
  10. 2026-10-3013
  11. 2026-11-0113
Users
+1 since 31.08
10-15 · 23 readings
  1. 2026-08-3112
  2. 2026-09-0213
  3. 2026-09-0411
  4. 2026-09-0710
  5. 2026-09-0911
  6. 2026-09-1013
  7. 2026-09-1611
  8. 2026-09-2113
  9. 2026-09-2212
  10. 2026-09-2513
  11. 2026-09-2712
  12. 2026-09-2811
  13. 2026-10-0414
  14. 2026-10-0915
  15. 2026-10-1013
  16. 2026-10-1612
  17. 2026-10-1813
  18. 2026-10-2212
  19. 2026-10-2414
  20. 2026-10-2813
  21. 2026-10-2912
  22. 2026-10-3013
  23. 2026-11-0113

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.

  • 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

JST EXPRESS CORP.

Like this one

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

  1. Calculadora Describes nearly the same job, smaller audience 6 users
  2. Calculator (iOS Inspired) Describes nearly the same job, smaller audience 64 users
  3. Calculator Describes nearly the same job, smaller audience 90 users ★ 5.0
  4. Basic Calculator Describes nearly the same job, smaller audience 81 users
  5. FusionCalc (Memo Calculator) Describes nearly the same job, smaller audience 44 users

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

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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 2026-10-30. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built