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Katsuyo Master

Chrome extension by zystudios.cc · Productivity · Education

  • Established publisher

A Chrome extension in Productivity · Education with 8 users, barely installed. Audience over the last 30 days: +2.

Every site you visit. This extension can read and change the content of any page you open.

What the developer says, and 1 screenshot

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

Users
8
Rating
5.0 (1 ratings)
Users, last 30 days
+2
Rating, last 30 days
Steady over 30 days
Version
1.0.3.9
Updated in the store
2026-10-28
Published
2026-05-11
Manifest
V3
Browser access
2 permissions, 3 site patterns

How it has moved

Users
+2 since 13.10
6-8 · 13 readings
2026-10-28: released 1.0.3.9
  1. 2026-10-187
  2. 2026-10-196
  3. 2026-10-217
  4. 2026-10-238
  5. 2026-10-247
  6. 2026-10-297
  7. 2026-11-017
  8. 2026-11-036
  9. 2026-11-057
  10. 2026-11-078
  11. 2026-11-087
  12. 2026-11-108
  13. 2026-11-128
Rating
unchanged since 13.10
reviewsrating 5.00 · 13 readings
2026-10-28: released 1.0.3.9
  1. 2026-10-18reviews1rating5.00
  2. 2026-10-19reviews1rating5.00
  3. 2026-10-21reviews1rating5.00
  4. 2026-10-23reviews1rating5.00
  5. 2026-10-24reviews1rating5.00
  6. 2026-10-29reviews1rating5.00
  7. 2026-11-01reviews1rating5.00
  8. 2026-11-03reviews1rating5.00
  9. 2026-11-05reviews1rating5.00
  10. 2026-11-07reviews1rating5.00
  11. 2026-11-08reviews1rating5.00
  12. 2026-11-10reviews1rating5.00
  13. 2026-11-12reviews1rating5.00
Users
+2 since 01.09
5-8 · 30 readings
2026-09-25: released 1.0.3.22026-09-26: released 1.0.3.32026-09-29: released 1.0.3.52026-09-30: released 1.0.3.62026-10-10: released 1.0.3.72026-10-12: released 1.0.3.82026-10-28: released 1.0.3.9
  1. 2026-09-016
  2. 2026-09-027
  3. 2026-09-038
  4. 2026-09-046
  5. 2026-09-067
  6. 2026-09-076
  7. 2026-09-087
  8. 2026-09-106
  9. 2026-09-157
  10. 2026-09-166
  11. 2026-09-207
  12. 2026-09-216
  13. 2026-09-267released 1.0.3.3
  14. 2026-09-286
  15. 2026-10-085
  16. 2026-10-097
  17. 2026-10-106released 1.0.3.7
  18. 2026-10-187
  19. 2026-10-196
  20. 2026-10-217
  21. 2026-10-238
  22. 2026-10-247
  23. 2026-10-297
  24. 2026-11-017
  25. 2026-11-036
  26. 2026-11-057
  27. 2026-11-078
  28. 2026-11-087
  29. 2026-11-108
  30. 2026-11-128
Rating
unchanged since 01.09
reviewsrating 5.00 · 30 readings
2026-09-25: released 1.0.3.22026-09-26: released 1.0.3.32026-09-29: released 1.0.3.52026-09-30: released 1.0.3.62026-10-10: released 1.0.3.72026-10-12: released 1.0.3.82026-10-28: released 1.0.3.9
  1. 2026-09-01reviews1rating5.00
  2. 2026-09-02reviews1rating5.00
  3. 2026-09-03reviews1rating5.00
  4. 2026-09-04reviews1rating5.00
  5. 2026-09-06reviews1rating5.00
  6. 2026-09-07reviews1rating5.00
  7. 2026-09-08reviews1rating5.00
  8. 2026-09-10reviews1rating5.00
  9. 2026-09-15reviews1rating5.00
  10. 2026-09-16reviews1rating5.00
  11. 2026-09-20reviews1rating5.00
  12. 2026-09-21reviews1rating5.00
  13. 2026-09-26reviews1rating5.00released 1.0.3.3
  14. 2026-09-28reviews1rating5.00
  15. 2026-10-08reviews1rating5.00
  16. 2026-10-09reviews1rating5.00
  17. 2026-10-10reviews1rating5.00released 1.0.3.7
  18. 2026-10-18reviews1rating5.00
  19. 2026-10-19reviews1rating5.00
  20. 2026-10-21reviews1rating5.00
  21. 2026-10-23reviews1rating5.00
  22. 2026-10-24reviews1rating5.00
  23. 2026-10-29reviews1rating5.00
  24. 2026-11-01reviews1rating5.00
  25. 2026-11-03reviews1rating5.00
  26. 2026-11-05reviews1rating5.00
  27. 2026-11-07reviews1rating5.00
  28. 2026-11-08reviews1rating5.00
  29. 2026-11-10reviews1rating5.00
  30. 2026-11-12reviews1rating5.00

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

Every site you visit. This extension can read and change the content of any page you open.

  • Store data in your browser storage
  • Read your display setup system.display

The full permission history for this extension

Version history

  1. Version 1.0.3.9
  2. Version 1.0.3.8
  3. Version 1.0.3.7
Show the remaining 4
  1. Version 1.0.3.6
  2. Version 1.0.3.5
  3. Version 1.0.3.3
  4. Version 1.0.3.2 · Asked for more permissions (5, was 4)

What changed recently

  1. Package size changed
  2. Released version 1.0.3.9 (was 1.0.3.8)
  3. Released version 1.0.3.8 (was 1.0.3.7)
Show the remaining 9
  1. Package size changed
  2. Released version 1.0.3.7 (was 1.0.3.6)
  3. Package size changed
  4. Released version 1.0.3.6 (was 1.0.3.5)
  5. Package size changed
  6. Released version 1.0.3.5 (was 1.0.3.3)
  7. Package size changed
  8. Released version 1.0.3.3 (was 1.0.3.2)
  9. Package size changed

Older entries and the full day by day series are in the app.

The publisher

zystudios.cc publishes 10 listings we track, 499 users between them. Listed website: zystudios.cc.

  1. Keep Awake zystudios.cc · Productivity · Tools · published 2025-11-01 249 users ★ 5.0
  2. Web Click Counter zystudios.cc · Productivity · Tools · published 2026-05-18 106 users ★ 5.0
  3. Jenkins Job Assistant zystudios.cc · Productivity · Tools · published 2026-05-02 33 users ★ 5.0
Show 5 more from this publisher
  1. Cookie Sync Assistant zystudios.cc · Productivity · Developer · published 2025-11-03 30 users ★ 5.0
  2. Web Proxy Assistant zystudios.cc · Productivity · Tools · published 2026-04-17 20 users ★ 5.0
  3. Http Request Assistant zystudios.cc · Productivity · Developer · published 2025-11-03 18 users ★ 5.0
  4. Kana Blitz zystudios.cc · Productivity · Education · published 2026-05-09 14 users ★ 5.0
  5. GitHub PR Assistant zystudios.cc · Productivity · Tools · published 2025-09-19 11 users ★ 5.0

Like this one

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

  1. JVS Assistant Describes nearly the same job, smaller audience 8 users
  2. nihongoTab Describes nearly the same job, smaller audience 150 users ★ 5.0
  3. VocaLoca Describes nearly the same job, smaller audience 5 users ★ 5.0
  4. Answer input for Tae Kim's guide to Japanese Describes nearly the same job, smaller audience 3 users
  5. Handy Japanese Tools Describes nearly the same job, smaller audience 9 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

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

HTML

<a href="https://extops.dev/extensions/nilpbnldgeffalghahehcddkfhnfplnb"><img src="https://extops.dev/extensions/nilpbnldgeffalghahehcddkfhnfplnb/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 2026-11-10. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built