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MarkStamp - Timestamp Notes for YouTube

Chrome extension by yoshihiro19880122 · Productivity · Tools

A Chrome extension in Productivity · Tools with 5 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 2 screenshots

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

Users
5
Rating
not rated yet
Users, last 14 days
unchanged
Version
1.0.0
Updated in the store
2026-07-12
Published
2026-07-06
Manifest
V3
Browser access
1 permission

How it has moved

Users
unchanged since 01.09
5-6 · 8 readings
  1. 2026-09-015
  2. 2026-09-036
  3. 2026-09-045
  4. 2026-09-066
  5. 2026-09-075
  6. 2026-09-096
  7. 2026-09-105
  8. 2026-09-145
Users
unchanged since 01.09
5-6 · 8 readings
  1. 2026-09-015
  2. 2026-09-036
  3. 2026-09-045
  4. 2026-09-066
  5. 2026-09-075
  6. 2026-09-096
  7. 2026-09-105
  8. 2026-09-145

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

yoshihiro19880122.

Like this one

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

  1. TimeNotes - Timestamp Notes for YouTube Describes nearly the same job, smaller audience 5 users
  2. YouTube Timestamp Notes Describes nearly the same job, smaller audience 53 users
  3. YouTube Timestamp Notes Describes nearly the same job, smaller audience 6 users ★ 5.0
  4. NoteFrames Describes nearly the same job, smaller audience 16 users ★ 5.0
  5. Keepr Notes — Timestamped Video Notes Describes nearly the same job audience not published ★ 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.

Is this your extension?

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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.