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Ka-Block!
What it is
Ka-Block! is a Safari content blocker for advertisements and trackers, offered as an extension plus iOS and macOS apps. Its curated filter list targets third-party scripts; the maker says blocking them can reduce page loading time, data use, and battery drain. The project aims to block most ads and trackers without slowing pages, while noting that some advertisements may still appear. Ka-Block! says its filtering code makes no network connections and that the extension does not access pages loaded by the browser. Apple’s listing reports that the developer says the app does not collect data. The software is open source under the MIT license. Users cannot add custom filter lists, and the blocked-domain list changes only when a new extension version is released. Version 3.5 is listed from November 6, 2021. The iOS and iPad listings require version 12.0 or later.
For and against
For
- Free plan at no cost
- Available on extension, iOS, and macOS
- Curated filter list targets ads and trackers
- Filtering code makes zero network connections
- Open source under the MIT license
Against
- Some ads may still get through
- No custom filter lists
- Filter updates require a new extension release
- Listed version 3.5 dates from November 6, 2021
The verdict
Ka-Block! provides a free, focused Safari blocking tool across desktop and mobile Apple platforms. Its curated, open-source approach has clear limits around customization and filter update timing.
Who it suits
Ka-Block! suits Safari users on desktop or mobile who want a free, curated blocker for ads and trackers. It also fits readers seeking open-source software with a stated no-data-collection disclosure.
Plans and prices
Free
Safari content blocking · Curated filter list · Open source
Read 21 Sep 2026 · apps.apple.com
Ka-Block!
Safari content blocker · iOS and macOS
Read 8 Oct 2026 · apps.apple.com
On the record
- Age compatibility
- The iOS listing requires iOS 12.0 or later, and the iPad listing requires iPadOS 12.0 or later.apps.apple.com · read 8 Oct 2026
- Browser support
- single-browsergithub.com · read 21 Sep 2026
- Custom filter lists
- Nogithub.com · read 21 Sep 2026
- Device coverage
- desktop-and-mobilegithub.com · read 21 Sep 2026
- Filtering approach
- The project aims to block most ads and trackers without slowing pages, and acknowledges that some ads may get through.github.com · read 8 Oct 2026
- Filter list
- The App Store description calls its filter list fast and curated.apps.apple.com · read 8 Oct 2026
- Filter updates
- The project says the blocked-domain list can only be updated by releasing a new version of the extension.github.com · read 8 Oct 2026
- Latest listed version
- The App Store version history lists version 3.5, dated November 6, 2021.apps.apple.com · read 8 Oct 2026
- Open source
- The project is released under the MIT license.github.com · read 8 Oct 2026
- Privacy
- The project says its filtering code makes zero network connections and the extension does not access pages loaded by the browser.github.com · read 8 Oct 2026
- Privacy disclosure
- Apple’s listing reports the developer’s disclosure that the app does not collect data.apps.apple.com · read 8 Oct 2026
- Product
- Ka-Block! is a Safari browser extension that blocks a curated selection of advertisements and trackers.kablock.com · read 8 Oct 2026
- Purpose
- The maker says blocking third-party scripts can reduce page load time, data use, and battery drain.apps.apple.com · read 8 Oct 2026
- Support
- The project invites users to submit a pull request with an ad-serving domain and a site where its ads appear.github.com · read 8 Oct 2026
