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Master Collection for TCG Collector

Chrome extension by felker.tech · Productivity · Tools

A Chrome extension in Productivity · Tools with 42 users, barely installed. Audience over the last 30 days: -3.

Specific sites only: 1 match pattern.

What the developer says, and 3 screenshots

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

Users
42
Rating
5.0 (1 ratings)
Users, last 30 days
-3
Rating, last 30 days
Steady over 30 days
Version
1.2.0
Updated in the store
2025-09-05
Published
2024-03-26
Manifest
V3
Browser access
1 site pattern

How it has moved

Users
-3 since 02.10
42-49 · 12 readings
  1. 2026-10-0847
  2. 2026-10-0946
  3. 2026-10-1144
  4. 2026-10-1343
  5. 2026-10-1647
  6. 2026-10-1748
  7. 2026-10-2049
  8. 2026-10-2148
  9. 2026-10-2547
  10. 2026-10-2845
  11. 2026-10-3048
  12. 2026-11-0142
Rating
unchanged since 02.10
reviewsrating 5.00 · 12 readings
  1. 2026-10-08reviews1rating5.00
  2. 2026-10-09reviews1rating5.00
  3. 2026-10-11reviews1rating5.00
  4. 2026-10-13reviews1rating5.00
  5. 2026-10-16reviews1rating5.00
  6. 2026-10-17reviews1rating5.00
  7. 2026-10-20reviews1rating5.00
  8. 2026-10-21reviews1rating5.00
  9. 2026-10-25reviews1rating5.00
  10. 2026-10-28reviews1rating5.00
  11. 2026-10-30reviews1rating5.00
  12. 2026-11-01reviews1rating5.00
Users
-4 since 01.09
42-49 · 20 readings
  1. 2026-09-0146
  2. 2026-09-0247
  3. 2026-09-0548
  4. 2026-09-0747
  5. 2026-09-0846
  6. 2026-09-1548
  7. 2026-09-1746
  8. 2026-09-2845
  9. 2026-10-0847
  10. 2026-10-0946
  11. 2026-10-1144
  12. 2026-10-1343
  13. 2026-10-1647
  14. 2026-10-1748
  15. 2026-10-2049
  16. 2026-10-2148
  17. 2026-10-2547
  18. 2026-10-2845
  19. 2026-10-3048
  20. 2026-11-0142
Rating
unchanged since 01.09
reviewsrating 5.00 · 20 readings
  1. 2026-09-01reviews1rating5.00
  2. 2026-09-02reviews1rating5.00
  3. 2026-09-05reviews1rating5.00
  4. 2026-09-07reviews1rating5.00
  5. 2026-09-08reviews1rating5.00
  6. 2026-09-15reviews1rating5.00
  7. 2026-09-17reviews1rating5.00
  8. 2026-09-28reviews1rating5.00
  9. 2026-10-08reviews1rating5.00
  10. 2026-10-09reviews1rating5.00
  11. 2026-10-11reviews1rating5.00
  12. 2026-10-13reviews1rating5.00
  13. 2026-10-16reviews1rating5.00
  14. 2026-10-17reviews1rating5.00
  15. 2026-10-20reviews1rating5.00
  16. 2026-10-21reviews1rating5.00
  17. 2026-10-25reviews1rating5.00
  18. 2026-10-28reviews1rating5.00
  19. 2026-10-30reviews1rating5.00
  20. 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: 1 match pattern.

  • https://*.tcgcollector.com/*

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

felker.tech publishes 3 listings we track, 148 users between them.

  1. Rafflesia for Overleaf felker.tech · Productivity · Workflow · published 2022-06-28 95 users
  2. Felker Web Clipper felker.tech · Productivity · Tools · published 2025-11-22 11 users

Like this one

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

  1. Collector Extension Describes nearly the same job, smaller audience 9 users
  2. Card Collection Sharer Describes nearly the same job, smaller audience 5 users
  3. Pokemon Card Viewer Describes nearly the same job, smaller audience 993 users ★ 3.3
  4. TCGPile — MTG Collection Companion Describes nearly the same job, smaller audience 13 users ★ 5.0
  5. BetterPokecardex Describes nearly the same job, smaller audience 42 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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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