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SPECIFICTION
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Ka-Block!

kablock.com

Free plan macOSiOSBrowser extension
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Spec score 7.9 #3 of 11 in Safari Extensions

What it is

Ka-Block! is a free Safari browser extension for blocking a curated selection of advertisements and trackers. It is available as an extension and on iOS and macOS, covering desktop and mobile devices while supporting only Safari. The project says blocking third-party scripts can reduce page-load time, data use and battery drain. Its filtering code makes zero network connections, and the extension does not access pages loaded by the browser. Apple’s listing reports that the developer says the app collects no data. Ka-Block! aims to block most ads and trackers without slowing pages, while acknowledging that some advertisements may remain. The blocked-domain list changes only when a new extension version is released, and custom filter lists are not supported. The project is open source under the MIT license. The listed plans cost nothing. iOS requires version 12.0 or later, and the listed App Store version is 3.5 from November 6, 2021.

Spec sheet

Purpose
The maker says blocking third-party scripts can reduce page load time, data use, and battery drain.Read 8 Oct 2026 · apps.apple.com
Product
Ka-Block! is a Safari browser extension that blocks a curated selection of advertisements and trackers.Read 8 Oct 2026 · kablock.com
Platforms
The project lists installation through the Mac App Store and the iOS App Store.Read 8 Oct 2026 · github.com
Free plan
YesRead 21 Sep 2026 · github.com
Privacy
The project says its filtering code makes zero network connections and the extension does not access pages loaded by the browser.Read 8 Oct 2026 · github.com
Support
The project invites users to submit a pull request with an ad-serving domain and a site where its ads appear.Read 8 Oct 2026 · github.com
Age compatibility
The iOS listing requires iOS 12.0 or later, and the iPad listing requires iPadOS 12.0 or later.Read 8 Oct 2026 · apps.apple.com
Browser support
single-browserRead 21 Sep 2026 · github.com
Custom filter lists
NoRead 21 Sep 2026 · github.com
Device coverage
desktop-and-mobileRead 21 Sep 2026 · github.com
Filter list
The App Store description calls its filter list fast and curated.Read 8 Oct 2026 · apps.apple.com
Filter updates
The project says the blocked-domain list can only be updated by releasing a new version of the extension.Read 8 Oct 2026 · github.com
Filtering approach
The project aims to block most ads and trackers without slowing pages, and acknowledges that some ads may get through.Read 8 Oct 2026 · github.com
Latest listed version
The App Store version history lists version 3.5, dated November 6, 2021.Read 8 Oct 2026 · apps.apple.com
Open source
The project is released under the MIT license.Read 8 Oct 2026 · github.com
Privacy disclosure
Apple’s listing reports the developer’s disclosure that the app does not collect data.Read 8 Oct 2026 · apps.apple.com

Plans and prices

Free Free Safari content blocking · Curated filter list · Open source Read 21 Sep 2026 · apps.apple.com
Ka-Block! Free Safari content blocker · iOS and macOS Read 8 Oct 2026 · apps.apple.com

Every Ka-Block! plan and price →

Strong points and limits

Strong points

  • Free Safari content blocker
  • Zero network connections for filtering code
  • Open source under MIT license
  • Available on iOS and macOS
  • Developer disclosure says no data collection

Limits

  • Some ads may get through
  • No custom filter lists
  • Filter updates require a new release
  • Safari-only browser support

Who it suits

It suits Safari users wanting a free, open-source blocker on iOS, macOS or supported Apple devices, without custom filter lists.

Verdict

Ka-Block! offers a focused Safari blocker with a curated list, local filtering approach and no listed cost. Its fixed filter-update process and lack of custom lists matter to users who want to manage filtering themselves.

Where Specifiction places it

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