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HTML Tag Checker by ACHN

Chrome extension by ACHN · Productivity · Developer

A Chrome extension in Productivity · Developer with 51 users, barely installed.

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

What the developer says, and 5 screenshots

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

Users
51
Rating
5.0 (1 ratings)
Users, last 17 days
+2
Rating, last 30 days
Not watched long enough to say
Version
0.1.6.8
Updated in the store
2026-02-27
Published
2025-05-31
Manifest
V3
Browser access
1 permission

How it has moved

Users
+2 since 01.09
47-51 · 8 readings
  1. 2026-09-0149
  2. 2026-09-0351
  3. 2026-09-0448
  4. 2026-09-0647
  5. 2026-09-0848
  6. 2026-09-1350
  7. 2026-09-1551
  8. 2026-09-1751
Rating
unchanged since 01.09
reviewsrating 5.00 · 8 readings
  1. 2026-09-01reviews1rating5.00
  2. 2026-09-03reviews1rating5.00
  3. 2026-09-04reviews1rating5.00
  4. 2026-09-06reviews1rating5.00
  5. 2026-09-08reviews1rating5.00
  6. 2026-09-13reviews1rating5.00
  7. 2026-09-15reviews1rating5.00
  8. 2026-09-17reviews1rating5.00
Users
+2 since 01.09
47-51 · 8 readings
  1. 2026-09-0149
  2. 2026-09-0351
  3. 2026-09-0448
  4. 2026-09-0647
  5. 2026-09-0848
  6. 2026-09-1350
  7. 2026-09-1551
  8. 2026-09-1751
Rating
unchanged since 01.09
reviewsrating 5.00 · 8 readings
  1. 2026-09-01reviews1rating5.00
  2. 2026-09-03reviews1rating5.00
  3. 2026-09-04reviews1rating5.00
  4. 2026-09-06reviews1rating5.00
  5. 2026-09-08reviews1rating5.00
  6. 2026-09-13reviews1rating5.00
  7. 2026-09-15reviews1rating5.00
  8. 2026-09-17reviews1rating5.00

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once 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.

  • 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.

The publisher

ACHN publishes 2 listings we track, 73 users between them. Listed website: achn.jp.

  1. RSS Highlight ACHN · Productivity · Tools · published 2026-02-15 22 users ★ 5.0

Like this one

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

  1. HTML Tag Error Checker Describes nearly the same job, smaller audience 6k users ★ 5.0
  2. HTMLタグチェッカー HTML DIAGNOSTIC SYSTEM Describes nearly the same job, smaller audience 3 users
  3. HTML 태그 검사기 Describes nearly the same job, smaller audience 8 users
  4. HTML validator Describes nearly the same job, smaller audience 557 users ★ 5.0
  5. HTML Validator Describes nearly the same job, smaller audience 2k users ★ 3.6

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.

Is this your extension?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.