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Cert Tool

Chrome extension by mkontani · Productivity · Developer

A Chrome extension in Productivity · Developer with 48 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 4 screenshots

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

Users
48
Rating
not rated yet
Users, last 14 days
+6
Version
1.0.1
Updated in the store
2026-01-07
Published
2026-01-05
Manifest
V3
Browser access
1 permission

How it has moved

Users
+6 since 01.09
42-48 · 8 readings
  1. 2026-09-0142
  2. 2026-09-0344
  3. 2026-09-0445
  4. 2026-09-0647
  5. 2026-09-0846
  6. 2026-09-0947
  7. 2026-09-1348
  8. 2026-09-1448
Users
+6 since 01.09
42-48 · 8 readings
  1. 2026-09-0142
  2. 2026-09-0344
  3. 2026-09-0445
  4. 2026-09-0647
  5. 2026-09-0846
  6. 2026-09-0947
  7. 2026-09-1348
  8. 2026-09-1448

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.

  • Manage your downloads downloads

The full permission history for this extension

What changed recently

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

The publisher

mkontani publishes 7 listings we track, 158 users between them.

  1. SSH Keytool mkontani · Productivity · Developer · published 2025-12-30 45 users
  2. サクラ診断 — レビュー評価分布＆端末内AIチェッカー mkontani · Lifestyle · Shopping · published 2026-06-07 25 users
  3. PEM Inspector mkontani · Productivity · Developer · published 2025-05-13 14 users
Show 3 more from this publisher
  1. Status Cat mkontani · Lifestyle · Art · published 2026-01-02 13 users
  2. Chrometchi mkontani · Lifestyle · Entertainment · published 2026-01-01 7 users
  3. Photo EXIF Util mkontani · Productivity · Tools · published 2026-05-10 6 users

Like this one

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

  1. Rites Digital Server Signer Describes nearly the same job, smaller audience 87 users
  2. PlatformKeys Test Extension Describes nearly the same job, smaller audience 166 users ★ 3.0
  3. CertChain Inspector Describes nearly the same job, smaller audience 30 users
  4. Signer.Digital Digital Signature, PKI Describes nearly the same job, with a large installed audience 3.0M users ★ 4.2
  5. Autenticou Signer Describes nearly the same job, smaller audience 8 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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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.