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AltC.ai: Hotkey-Powered AI Grammar Checker & Rewriter

Chrome extension · Productivity · Tools

  • Established publisher

A Chrome extension in Productivity · Tools with 242 users, barely installed. Audience over the last 30 days: +13.

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
242
Rating
5.0 (78 ratings)
Users, last 30 days
+13
Rating, last 30 days
Steady over 30 days
Version
1.0.4
Updated in the store
2025-12-04
Published
2025-05-02
Manifest
V3
Browser access
3 permissions, 1 site pattern

How it has moved

Users
+13 since 01.10
219-242 · 17 readings
  1. 2026-10-05219
  2. 2026-10-08232
  3. 2026-10-09230
  4. 2026-10-10235
  5. 2026-10-11234
  6. 2026-10-13233
  7. 2026-10-16230
  8. 2026-10-17226
  9. 2026-10-18228
  10. 2026-10-19231
  11. 2026-10-21234
  12. 2026-10-22235
  13. 2026-10-24229
  14. 2026-10-25235
  15. 2026-10-28240
  16. 2026-10-29242
  17. 2026-10-31242
Rating
unchanged since 01.10
reviewsrating 5.00 · 17 readings
  1. 2026-10-05reviews77rating5.00
  2. 2026-10-08reviews77rating5.00
  3. 2026-10-09reviews77rating5.00
  4. 2026-10-10reviews77rating5.00
  5. 2026-10-11reviews77rating5.00
  6. 2026-10-13reviews77rating5.00
  7. 2026-10-16reviews77rating5.00
  8. 2026-10-17reviews77rating5.00
  9. 2026-10-18reviews77rating5.00
  10. 2026-10-19reviews77rating5.00
  11. 2026-10-21reviews77rating5.00
  12. 2026-10-22reviews78rating5.00
  13. 2026-10-24reviews78rating5.00
  14. 2026-10-25reviews78rating5.00
  15. 2026-10-28reviews78rating5.00
  16. 2026-10-29reviews78rating5.00
  17. 2026-10-31reviews78rating5.00
Users
+31 since 01.09
208-252 · 33 readings
  1. 2026-09-01211
  2. 2026-09-03212
  3. 2026-09-04215
  4. 2026-09-06210
  5. 2026-09-07208
  6. 2026-09-08210
  7. 2026-09-09211
  8. 2026-09-10222
  9. 2026-09-13233
  10. 2026-09-15238
  11. 2026-09-17242
  12. 2026-09-20251
  13. 2026-09-22252
  14. 2026-09-25247
  15. 2026-09-27244
  16. 2026-09-28229
  17. 2026-10-05219
  18. 2026-10-08232
  19. 2026-10-09230
  20. 2026-10-10235
  21. 2026-10-11234
  22. 2026-10-13233
  23. 2026-10-16230
  24. 2026-10-17226
  25. 2026-10-18228
  26. 2026-10-19231
  27. 2026-10-21234
  28. 2026-10-22235
  29. 2026-10-24229
  30. 2026-10-25235
  31. 2026-10-28240
  32. 2026-10-29242
  33. 2026-10-31242
Rating
unchanged since 01.09
reviewsrating 5.00 · 33 readings
  1. 2026-09-01reviews77rating5.00
  2. 2026-09-03reviews77rating5.00
  3. 2026-09-04reviews77rating5.00
  4. 2026-09-06reviews77rating5.00
  5. 2026-09-07reviews77rating5.00
  6. 2026-09-08reviews77rating5.00
  7. 2026-09-09reviews77rating5.00
  8. 2026-09-10reviews77rating5.00
  9. 2026-09-13reviews77rating5.00
  10. 2026-09-15reviews77rating5.00
  11. 2026-09-17reviews77rating5.00
  12. 2026-09-20reviews77rating5.00
  13. 2026-09-22reviews77rating5.00
  14. 2026-09-25reviews77rating5.00
  15. 2026-09-27reviews77rating5.00
  16. 2026-09-28reviews77rating5.00
  17. 2026-10-05reviews77rating5.00
  18. 2026-10-08reviews77rating5.00
  19. 2026-10-09reviews77rating5.00
  20. 2026-10-10reviews77rating5.00
  21. 2026-10-11reviews77rating5.00
  22. 2026-10-13reviews77rating5.00
  23. 2026-10-16reviews77rating5.00
  24. 2026-10-17reviews77rating5.00
  25. 2026-10-18reviews77rating5.00
  26. 2026-10-19reviews77rating5.00
  27. 2026-10-21reviews77rating5.00
  28. 2026-10-22reviews78rating5.00
  29. 2026-10-24reviews78rating5.00
  30. 2026-10-25reviews78rating5.00
  31. 2026-10-28reviews78rating5.00
  32. 2026-10-29reviews78rating5.00
  33. 2026-10-31reviews78rating5.00

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://altc.ai/*
  • Run its own code on the pages it can access scripting
  • 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

What changed recently

Nothing has moved on this listing since we started watching it.

Like this one

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

  1. Spellbound: AI Writing Assistant Describes nearly the same job, smaller audience 7 users
  2. GrammarFix - AI Grammar & Rewrite Describes nearly the same job, smaller audience 3 users (last published figure)
  3. AI Writing Assistant Describes nearly the same job, smaller audience 7 users
  4. Gemini Grammar & Rephrase Helper Describes nearly the same job, smaller audience 210 users
  5. AnyWrite - AI Writing Assistant 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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Figures come from our own regular passes over the public Chrome Web Store listing, last read on . The store last changed these figures on 2026-10-29. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built