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ProofKey: AI Grammar Checker & Writing Assistant with Your Own API Key

Chrome extension by Jiru Labs · Productivity · Workflow

A Chrome extension in Productivity · Workflow with 22 users, barely installed. Audience over the last 30 days: +13.

No site access is declared in the manifest, so it cannot read the pages you open on its own.

What the developer says, and 4 screenshots

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

Users
22
Rating
5.0 (2 ratings)
Users, last 30 days
+13
Rating, last 30 days
Steady over 30 days
Version
0.1.19
Updated in the store
2026-11-01
Published
2026-08-12
Manifest
V3
Browser access
5 permissions

How it has moved

Users
+13 since 02.10
9-22 · 12 readings
2026-10-02: released 0.1.112026-10-06: released 0.1.122026-10-08: released 0.1.132026-10-16: released 0.1.162026-10-20: released 0.1.172026-10-27: released 0.1.182026-11-01: released 0.1.19
  1. 2026-10-0413
  2. 2026-10-0815released 0.1.13
  3. 2026-10-1016
  4. 2026-10-1317
  5. 2026-10-1620released 0.1.16
  6. 2026-10-1821
  7. 2026-10-2220
  8. 2026-10-2421
  9. 2026-10-2522
  10. 2026-10-2719released 0.1.18
  11. 2026-10-2921
  12. 2026-11-0122released 0.1.19
Rating
unchanged since 02.10
reviewsrating 5.00 · 12 readings
2026-10-02: released 0.1.112026-10-06: released 0.1.122026-10-08: released 0.1.132026-10-16: released 0.1.162026-10-20: released 0.1.172026-10-27: released 0.1.182026-11-01: released 0.1.19
  1. 2026-10-04reviews2rating5.00
  2. 2026-10-08reviews2rating5.00released 0.1.13
  3. 2026-10-10reviews2rating5.00
  4. 2026-10-13reviews2rating5.00
  5. 2026-10-16reviews2rating5.00released 0.1.16
  6. 2026-10-18reviews2rating5.00
  7. 2026-10-22reviews2rating5.00
  8. 2026-10-24reviews2rating5.00
  9. 2026-10-25reviews2rating5.00
  10. 2026-10-27reviews2rating5.00released 0.1.18
  11. 2026-10-29reviews2rating5.00
  12. 2026-11-01reviews2rating5.00released 0.1.19
Users
+19 since 01.09
3-22 · 23 readings
2026-09-03: released 0.1.42026-09-05: released 0.1.52026-09-11: released 0.1.62026-09-14: released 0.1.72026-09-15: released 0.1.82026-09-16: released 0.1.92026-09-17: released 0.1.102026-10-02: released 0.1.112026-10-06: released 0.1.122026-10-08: released 0.1.132026-10-16: released 0.1.162026-10-20: released 0.1.172026-10-27: released 0.1.182026-11-01: released 0.1.19
  1. 2026-09-013
  2. 2026-09-024
  3. 2026-09-057released 0.1.5
  4. 2026-09-067
  5. 2026-09-077
  6. 2026-09-096
  7. 2026-09-134
  8. 2026-09-225
  9. 2026-09-2510
  10. 2026-09-268
  11. 2026-09-289
  12. 2026-10-0413
  13. 2026-10-0815released 0.1.13
  14. 2026-10-1016
  15. 2026-10-1317
  16. 2026-10-1620released 0.1.16
  17. 2026-10-1821
  18. 2026-10-2220
  19. 2026-10-2421
  20. 2026-10-2522
  21. 2026-10-2719released 0.1.18
  22. 2026-10-2921
  23. 2026-11-0122released 0.1.19
Rating
+5.00 since 01.09
reviewsrating 0.00-5.00 · 23 readings
2026-09-03: released 0.1.42026-09-05: released 0.1.52026-09-11: released 0.1.62026-09-14: released 0.1.72026-09-15: released 0.1.82026-09-16: released 0.1.92026-09-17: released 0.1.102026-10-02: released 0.1.112026-10-06: released 0.1.122026-10-08: released 0.1.132026-10-16: released 0.1.162026-10-20: released 0.1.172026-10-27: released 0.1.182026-11-01: released 0.1.19
  1. 2026-09-01reviews0rating0.00
  2. 2026-09-02reviews0rating0.00
  3. 2026-09-05reviews1rating5.00released 0.1.5
  4. 2026-09-06reviews2rating5.00
  5. 2026-09-07reviews2rating5.00
  6. 2026-09-09reviews2rating5.00
  7. 2026-09-13reviews2rating5.00
  8. 2026-09-22reviews2rating5.00
  9. 2026-09-25reviews2rating5.00
  10. 2026-09-26reviews2rating5.00
  11. 2026-09-28reviews2rating5.00
  12. 2026-10-04reviews2rating5.00
  13. 2026-10-08reviews2rating5.00released 0.1.13
  14. 2026-10-10reviews2rating5.00
  15. 2026-10-13reviews2rating5.00
  16. 2026-10-16reviews2rating5.00released 0.1.16
  17. 2026-10-18reviews2rating5.00
  18. 2026-10-22reviews2rating5.00
  19. 2026-10-24reviews2rating5.00
  20. 2026-10-25reviews2rating5.00
  21. 2026-10-27reviews2rating5.00released 0.1.18
  22. 2026-10-29reviews2rating5.00
  23. 2026-11-01reviews2rating5.00released 0.1.19

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.

  • Run its own code on the pages it can access scripting
  • Act on the current tab, but only after you click it activeTab
  • Add items to the right-click menu contextMenus
Show the remaining 2

The full permission history for this extension

Version history

  1. Version 0.1.19
  2. Version 0.1.18
  3. Version 0.1.17
Show the remaining 5
  1. Version 0.1.16
  2. Version 0.1.13
  3. Version 0.1.12
  4. Version 0.1.11 · Asked for more permissions (5, was 4)
  5. Version 0.1.10

What changed recently

  1. Released version 0.1.19 (was 0.1.18)
  2. Released version 0.1.18 (was 0.1.17)
  3. Released version 0.1.17 (was 0.1.16)
Show the remaining 9
  1. Package size changed
  2. Released version 0.1.16 (was 0.1.15)
  3. Package size changed
  4. Store description rewritten (128 → 129 characters)
  5. Released version 0.1.13 (was 0.1.12)
  6. Released version 0.1.12 (was 0.1.11)
  7. Store description rewritten
  8. Package size changed
  9. Asked for more permissions (5, was 4)

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

The publisher

Jiru Labs.

Like this one

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

  1. Inkwiz: Grammar Checker & AI Writing Assistant Describes nearly the same job, smaller audience 15 users ★ 5.0
  2. Grammar Guardian Describes nearly the same job, smaller audience 17 users ★ 5.0
  3. WriterHub - Free AI's Grammar Companion Describes nearly the same job, smaller audience 8 users
  4. Squiggle - Privacy focused grammar corrector Describes nearly the same job, smaller audience 3 users (last published figure) ★ 5.0
  5. Open Grammar Checker Describes nearly the same job, smaller audience 16 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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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 2026-11-01. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built