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Responsive Tester

Chrome extension by Cool and Fun Software · Productivity · Workflow

  • Featured
  • Established publisher

A Chrome extension in Productivity · Workflow with 40 000 users, an established extension.

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
40 000
Rating
3.1 (95 ratings)
Users, last 14 days
unchanged
Rating, last 30 days
Not watched long enough to say
Version
3.0.0
Updated in the store
2023-11-15
Published
2020-07-15
Manifest
V3
Browser access
1 permission

How it has moved

Users
unchanged since 01.09
40k · 2 readings
  1. 2026-09-0140k
  2. 2026-09-1440k
Rating
unchanged since 01.09
reviewsrating 3.10 · 2 readings
  1. 2026-09-01reviews95rating3.10
  2. 2026-09-14reviews95rating3.10
Users
unchanged since 01.09
40k · 2 readings
  1. 2026-09-0140k
  2. 2026-09-1440k
Rating
unchanged since 01.09
reviewsrating 3.10 · 2 readings
  1. 2026-09-01reviews95rating3.10
  2. 2026-09-14reviews95rating3.10

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.

  • Act on the current tab, but only after you click it activeTab

The full permission history for this extension

What changed recently

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

The publisher

Cool and Fun Software publishes 30 listings we track, 108k users between them. Listed website: test-responsive.freefinancetools.net.

  1. View Chrome History Cool and Fun Software · Productivity · Workflow · published 2020-07-27 40k users ★ 3.8
  2. CSS Selector Cool and Fun Software · Productivity · Workflow · published 2020-07-29 10k users ★ 2.4
  3. Timer for Google Meet Cool and Fun Software · Productivity · Workflow · published 2020-07-27 10k users ★ 3.7
Show 5 more from this publisher
  1. Copy To Clipboard Cool and Fun Software · Productivity · Workflow · published 2020-07-15 6k users ★ 2.2
  2. Tab Renamer Cool and Fun Software · Make Chrome Yours · Functionality · published 2026-06-03 385 users
  3. Shift Pitch Audio Cool and Fun Software · Make Chrome Yours · Functionality · published 2026-06-02 274 users ★ 4.5
  4. Background Color Overrider Cool and Fun Software · Make Chrome Yours · Functionality · published 2026-05-14 225 users ★ 4.0
  5. Bold All Text Toggle Cool and Fun Software · Make Chrome Yours · Functionality · published 2026-05-13 196 users ★ 4.3

Like this one

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

  1. Mobile Simulator Innoventix Describes nearly the same job, smaller audience 29 users
  2. Responsively Describes nearly the same job, smaller audience 46 users
  3. Responsive Lab Describes nearly the same job, smaller audience 32 users
  4. Device Simulator Describes nearly the same job, smaller audience 3 users (last published figure)
  5. Mobile View Tester Describes nearly the same job, smaller audience 12 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.