Ka-Block!
Developed by Negative Code, LLC · Version 3.5 (7.8 MB)
Screenshots & Interface
About
Why Install Ka-Block! on Safari?
An open-source, ultra-fast content blocker with curated rules.
Uses Apple Declarative Net Request / Content Blocker API without reading page content
Capped under WebKit 150,000 rule limitations to guarantee ultra-fast page paint speed
Consumes virtually 0 MB extra memory compared to heavy Chromium background filters
Does This Extension Fit Your Workflow?
✓ Best Suited For
MacBook and iPhone users who prioritize battery life, pure ad-free reading, and zero privacy exposure.
⚠️ Who Might Skip
Users requiring continuous dynamic cosmetic element hiding that demands intrusive full-page DOM rewriting.
What's New in Version v3.5
What Real Users Say About Ka-Block!
Authentic feedback and real-world ratings from Mac & iOS users
Works great!
"And it’s free!"
Didn’t do well compared to other free apps
"Did poorly in various Adblock testing websites for $0."
Doesn’t work
"It doesn’t work for me"
Great, Simple Ad Blocker
"Edit: I realized Safari has an option to allow you to chose websites to exclude from content blockers. With that in mind, I think Ka-Block is nearly perfect! Original: Ka-Block works great. I’ve almost never had it interfere with website content. Only one complaint: there is no whitelist option to exclude websites you want to support."
Got Questions About Ka-Block!?
Q.Is Ka-Block! free, or does it require a subscription?
Ka-Block! is 100% free to download on the Apple App Store without predatory weekly subscription traps. You can install and use it across your Mac and iPhone Safari browsers.
Q.How do I enable Ka-Block! in macOS and iOS Safari?
On Mac (macOS): After downloading from the Mac App Store, open the application once, then launch Safari -> click "Settings" (or Preferences) in the menu bar -> select the "Extensions" tab -> locate "Ka-Block!" and check the box to enable it. On iPhone/iPad (iOS): Go to iOS "Settings" -> tap "Safari" -> tap "Extensions" -> select "Ka-Block!" and toggle it ON.
Q.Why is Safari ad-blocking much faster and lighter than Google Chrome?
Chrome extensions traditionally execute heavy JavaScript inside every web page to inspect and block URLs on the fly. Safari uses native compiled JSON rule lists processed directly by Apple WebKit engine in C++, preventing ads from even starting to download without executing third-party code in your tabs.
Q.Does this extension work in Safari Private Browsing mode?
Yes! On macOS Sonoma / iOS 17 and later, go to Safari Settings -> Extensions, and ensure "Allow in Private Browsing" is checked. This ensures the same clean and ad-free experience while safeguarding your incognito sessions.
Maximize Your Productivity on macOS & iOS
In Safari Preferences -> Websites -> Content Blockers, you can easily toggle rules per domain with a single shortcut.
Ka-Block! Quality & Health Audit
Evaluated across verified App Store reputation, pricing ethics, update cadence, and native footprint.
★ 4.2 / 5.0 with 217 verified reviews
Open Source (Community Verified)
v3.5 - Actively Maintained
7.8 MB package size, Official developer site
Technical Specifications & App Store Metadata
Help fellow Mac & iOS users discover clean tools
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Looking for a Safari alternative to Ka-Block?
Ka-Block! is the premier 1-to-1 Safari replacement for Chrome's Ka-Block, saving battery and system RAM.
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