ZOKUZOKU

Official Browser Extension

Cat Gatekeeper

Use social media too long, and a cat takes over your screen
A cute browser extension that forces a break

Over 300,000 users

🐱 Chrome Store 🦊 Firefox Add-ons ☕ Buy me a coffee

Can't stop scrolling social media?

Willpower alone won't cut it.
What you need is a cat that barges in and gets in your way.
“That cute fluffball that plants itself in front of your screen mid-work” —
we brought that every-cat-owner moment to your browser.

It's too cute to resist; we humans are just servants to our cats!
So when the cat shows up, give in, enjoy the cuteness, and rest your eyes.

I installed it on one computer, and now it shows up on all my PCs. My social media life is better at home and at work (^^)/

WHAT'S NEW

September 22, 2026: Ver. 1.3.2 (Chrome & Firefox)

• Swapped one of the cats for a new one.

• Added 16 languages, on top of Japanese and English.

• Added a settings panel behind the gear icon at the top right of the menu, where you can see the cats that appear.

• A quick guide now opens right after you install the extension.

Past updates

August 6, 2026: Ver. 1.2.2 (Chrome & Firefox)

• Usage time now carries over when you switch tabs or windows, and you can check it for each site in the extension menu.

• Breaks now continue after you reload a page or reopen it in another tab.

• Major sites can now be selected with checkboxes, and YouTube and YouTube Shorts can be configured and tracked separately.

• Added a new cat and a shuffle system that makes the same cat less likely to appear twice in a row.

• You can now end a break by pressing and holding the break screen for three seconds, and cats now appear over fullscreen videos.

• Fixed minor issues and improved overall behavior.

June 10, 2026: Ver. 1.1.10 (Chrome & Firefox)

• The target domain for X has been updated from Twitter.com to x.com!

• Settings changes now apply to tabs that are already open!

May 30, 2026: Brave support and default waiting time update

Cat Gatekeeper now works on Brave browser.

The default waiting time has been changed from 30 minutes to 10 minutes.

If your waiting time changed after the update, please set your preferred time once and save it. Future updates will keep that saved time.

May 18, 2026: A new cat has been added!

Note: Cats appear at random.

Note: If you already have the extension installed, it may take several hours to about a day for the new cat to appear depending on the store and browser auto-update timing.

May 12, 2026: Firefox extension released

Cat Gatekeeper is now available on Firefox Add-ons.

May 6, 2026: Browser extension - custom sites added (v1.1.4)

Note: Tracking may reset on sites with frequent page changes or reloads. Cat Gatekeeper works best on social media and video sites where you stay on the same service for a while.

Note: To show the cat on custom sites, you will need to allow the new permission.

Note: If Cat Gatekeeper does not work after an update, please reload the target site once.

May 1, 2026: Official website launched

The official Cat Gatekeeper website is now available.

April 26, 2026: Chrome extension released

The official Chrome extension version of Cat Gatekeeper is now available.

Which one?

Browser Extension For when you keep scrolling social media on your PC Desktop App For when you get too focused and forget to take breaks
Mobile App Coming soon

HOW TO

  1. The puzzle-piece icon at the top right of the browser
    1

    Open the menu

    Click the puzzle-piece icon at the top right of your browser, then choose Cat Gatekeeper.

  2. Settings for when the cat appears, how long it stays, and target sites
    2

    Choose your times and sites

    Decide how long you can browse before the cat appears, and how long it stays for your break (10 and 5 minutes by default).

    Major social sites are already on the list — just tick the ones you want. You can also enter a URL to add any site.

  3. A cat appearing on the screen with a countdown
    3

    Take a break with the cat

    When time is up, the cat appears and stays on your screen until the countdown ends.

    To end early, press and hold the button that appears under the cat after a while for about three seconds, or use the dismiss button in the menu.

How time tracking works

  • Time is counted only while you are actually viewing a site you set
  • The same site open in several tabs counts as one
  • YouTube and YouTube Shorts are counted separately
  • Switch tabs or apps and come back within 30 minutes, and counting picks up where it left off
  • If you stay away for 30 minutes or more, the time resets
  • After each break, the count starts again from zero

* You can check the time so far under “Usage” in the menu.

PRIVACY

Here is what Cat Gatekeeper does and does not do with your data.

  • Site access is used only to track usage time and show the cat
  • Your browsing history and page content are never collected or sent anywhere
  • Settings and usage time are stored only in your browser
  • No ads and no tracking tools
  • The source code is public so you can check how it works

Q&A

Which sites does it work on?

You can choose from major social media and video sites, or add any site by entering its URL.

How is usage time measured?

Time is counted only while you are actually viewing a site you set. For how multiple tabs are handled and when the time resets, see “How time tracking works” in the how-to section.

Is it free?

Yes. Cat Gatekeeper is free to use.

Why is site access needed?

Site access is needed to measure usage time on the sites you choose and display the cat break screen. Cat Gatekeeper does not collect your browsing history or page content or send it outside your browser. Your settings and usage time for target sites are stored only in your browser.

Can I change the timer?

Yes. You can change both the time before the cat appears and how long it stays from the extension menu.

The cat does not appear.

Right after the extension updates automatically, the update may not take effect on pages that are already open. Make sure the target site is enabled, then reload the page once. If the issue continues, another extension may be interfering, so try temporarily disabling other extensions and test again.

Where can I open the menu?

Open the extensions (puzzle) icon in the top-right of your browser, then select Cat Gatekeeper.

Can I dismiss the cat?

Yes. A little while after the cat appears, a button shows up under it. Press and hold that button for about three seconds, or open the extension menu and press the dismiss button.

Which browsers are supported?

Cat Gatekeeper currently supports Chrome, Brave, and Firefox. Other browsers are also under consideration.

Is it available in other languages?

It supports 18 languages, including Japanese and English, and switches automatically to match your browser's language.

Supported languages: Japanese, English, Chinese (Simplified), Chinese (Traditional), Korean, Spanish, French, German, Italian, Portuguese (Brazil), Russian, Polish, Turkish, Hindi, Indonesian, Malay, Thai, Vietnamese

Are the cats real?

The cats in the videos are ideal cats created with the help of AI and carefully adjusted one by one to become the ultimate lovable distractions. Please treat them kindly as little gatekeepers for your desk.

Can I use the assets in the extension?

You are very welcome to include screenshots or screen recordings in posts introducing Cat Gatekeeper or sharing your impressions. However, please do not extract, reuse, or redistribute image or video assets included in the extension.

FOLLOW

Support

GitHub
EMAIL[email protected]