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Library Check for Zotero – Duplicate Detection

Chrome extension by Yukihiro Marui · Productivity · Tools

A Chrome extension in Productivity · Tools with 1 000 users, a small but real audience. Audience over the last 30 days: unchanged.

Specific sites only: 2 match patterns.

What the developer says, and 3 screenshots

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

Users
1 000
Rating
5.0 (1 ratings)
Users, last 30 days
Unchanged (the store rounds this count to 1 000, so it moves only between steps)
Rating, last 30 days
Steady over 30 days
Version
1.8.1
Updated in the store
2026-10-31
Published
2026-02-25
Manifest
V3
Browser access
3 permissions, 2 site patterns

How it has moved

Users
unchanged since 02.10
1k · 1 reading
2026-10-08: released 1.8.02026-10-31: released 1.8.1
  1. 2026-11-011k
Rating
unchanged since 02.10
reviewsrating 5.00 · 1 reading
2026-10-08: released 1.8.02026-10-31: released 1.8.1
  1. 2026-11-01reviews1rating5.00
Users
+206 since 01.09
794-1k · 15 readings
2026-09-08: released 1.6.02026-09-16: released 1.7.02026-10-08: released 1.8.02026-10-31: released 1.8.1
  1. 2026-09-01794
  2. 2026-09-02801
  3. 2026-09-03817
  4. 2026-09-04837
  5. 2026-09-05845
  6. 2026-09-06856
  7. 2026-09-07875
  8. 2026-09-08885released 1.6.0
  9. 2026-09-10907
  10. 2026-09-13961
  11. 2026-09-15977
  12. 2026-09-17991
  13. 2026-09-20993
  14. 2026-09-211k
  15. 2026-11-011k
Rating
+5.00 since 01.09
reviewsrating 0.00-5.00 · 15 readings
2026-09-08: released 1.6.02026-09-16: released 1.7.02026-10-08: released 1.8.02026-10-31: released 1.8.1
  1. 2026-09-01reviews0rating0.00
  2. 2026-09-02reviews1rating5.00
  3. 2026-09-03reviews1rating5.00
  4. 2026-09-04reviews1rating5.00
  5. 2026-09-05reviews1rating5.00
  6. 2026-09-06reviews1rating5.00
  7. 2026-09-07reviews1rating5.00
  8. 2026-09-08reviews1rating5.00released 1.6.0
  9. 2026-09-10reviews1rating5.00
  10. 2026-09-13reviews1rating5.00
  11. 2026-09-15reviews1rating5.00
  12. 2026-09-17reviews1rating5.00
  13. 2026-09-20reviews1rating5.00
  14. 2026-09-21reviews1rating5.00
  15. 2026-11-01reviews1rating5.00

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: 2 match patterns.

  • http://localhost:23119/*
  • http://127.0.0.1:23119/*
  • See the address and title of every tab you have open tabs
  • 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

Version history

  1. Version 1.8.1
  2. Version 1.8.0
  3. Version 1.7.0
Show the remaining 1
  1. Version 1.6.0

What changed recently

  1. Package size changed
  2. Renamed from "Library Check for Zotero – Prevent Duplicates" to "Library Check for Zotero – Duplicate Detection"
  3. Released version 1.8.1 (was 1.8.0)
Show the remaining 7
  1. Package size changed
  2. Supported languages changed (7 → 6)
  3. Released version 1.8.0 (was 1.7.0)
  4. Package size changed
  5. Released version 1.7.0 (was 1.6.0)
  6. Package size changed
  7. Released version 1.6.0 (was 1.5.0)

The publisher

Yukihiro Marui publishes 4 listings we track, 1k users between them.

  1. Focus Scope – Smart Website Blocker Yukihiro Marui · Productivity · Tools · published 2026-03-11 16 users
  2. Improved Panel for Google Scholar – Explore Faster Yukihiro Marui · Productivity · Tools · published 2026-10-31 1 user
  3. Pick Engine – Route Your Searches Yukihiro Marui · Productivity · Tools · published 2026-10-30 1 user

Like this one

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

  1. Google Scholar-Zotero Library Checker Describes nearly the same job, smaller audience 120 users
  2. Zotref Checker Describes nearly the same job, smaller audience 39 users
  3. Paper Library Checker Describes nearly the same job, smaller audience 7 users
  4. Paper check Describes nearly the same job, smaller audience 2 users (last published figure)
  5. zotero-toolkit Describes nearly the same job, smaller audience 29 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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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/njakhbdjddaflodiogjmbledldjjbbai/badge.svg)](https://extops.dev/extensions/njakhbdjddaflodiogjmbledldjjbbai)

HTML

<a href="https://extops.dev/extensions/njakhbdjddaflodiogjmbledldjjbbai"><img src="https://extops.dev/extensions/njakhbdjddaflodiogjmbledldjjbbai/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 2026-09-21. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built