# Ka-Block! — Open-source ad blocking

> Open-source Safari content blocker for improved web performance and privacy. (iPhone/iPad app by David Graham & Josh Peek.)

- Source: https://appshunter.io/ios/app/ka-block/id1037173557 (this page in markdown: same URL + `.md`)
- Developer: [David Graham & Josh Peek](https://appshunter.io/developer/1037173556)
- Category: Utilities
- Price: Free
- Rating: 4.20/5 from 216 App Store ratings · 141 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 8 MB
- Languages: American English
- Released: 2015-09-24
- Data updated: 2026-07-27
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ka-block/id1037173557/reviews.md

## What is Ka?

Ka-Block! is a content blocker for Safari that prevents ads and tracking scripts from slowing down web pages you visit.

Many sites use third-party scripts to track your behavior across the web, causing pages to load slowly and draining your phone’s battery. Blocking these scripts dramatically improves page load time, data usage, and battery life.

- Fast, curated filter list
- Open source
- Also available for Safari on Mac

Protecting privacy and performance on the web is important. We hope you enjoy Ka-Block!

## Key features

- Content blocking for Safari
- Blocks ads and tracking scripts
- Improves page load speed
- Reduces data usage
- Conserves battery life
- Open source

## What do users think of Ka?

Overall sentiment: mixed

**Pros**

- 🚀 Fast and lightweight performance
- 💰 Completely free with no in-app purchases
- 🔒 Open source with no data collection
- 👍 Simple and easy to set up
- ✅ Blocks most obtrusive ads effectively
- 🌐 Works across Mac, iPad, and iPhone ecosystem
- 🛡️ Doesn't break website functionality
- ⚡ Improves page load times
- 🎯 Effective on news and content sites

**Cons**

- ❌ Inconsistent ad blocking performance across platforms
- 📱 Doesn't block ads on YouTube or Facebook
- 🐛 Causes blue filter overlay on some news sites
- ⚠️ Blocks some legitimate website content
- 🚫 Fails to block certain ad types (gifs, flash, pop-unders)
- 🔧 No on/off toggle in app interface
- 📊 Limited blocking compared to competitors like AdGuard
- 🔐 Privacy concerns from older reviews about data collection
- ⏱️ Requires app updates to update filter lists

**Commonly reported bugs**

- Blue semi-opaque filter appearing on images on certain news sites
- Fails to block ads despite being enabled
- Creates unwanted popups instead of blocking them
- Breaks website functionality on some domains
- Doesn't work with subscription-based newspaper sites
- Inconsistent performance across different websites
- Unable to activate extension on some devices

**Most requested features**

- Whitelist/exclude option for websites to support
- Toggle to easily enable/disable the blocker
- Auto-update filter lists without app updates
- Block autoplay videos on news sites
- Display blocked tracker count for transparency
- Better blocking for YouTube ads
- Facebook tracker blocking

## Recent user reviews (10 of 141)

All indexed reviews: https://appshunter.io/ios/app/ka-block/id1037173557/reviews.md

### 5/5 — Ka-Blocking brilliant!

*2026-06-21, version 3.5*

Dose what it’s supposed to do and dosnt use or collect any of you data. Used this app for years, and it being free is an extra bonus. Thank you for your great work and app developers ☝🏻

### 2/5 — Free - but minimal

*2026-05-21, version 3.5*

Blocks the basic ads on some websites, but ultimately doesn’t do much. A few tests put it at about 30% effectiveness, hence two stars.

### 1/5 — Ad guard better

*2025-10-15, version 3.5*

Website said this blocks adds on not only safari but other apps to, but it doesn’t do that. Ad guard is better so don’t waste time on this 😐

### 5/5 — Works great!

*2025-09-16, version 3.5*

And it’s free!

### 1/5 — Не работает

*2025-08-02, version 3.5*

Вообще не работает, стало только хуже, теперь при просмотре фильмов/ сериалов, страница перезагружается и включается реклама. При просмотре 25 минутной серии теперь 3 рекламы вместо одной

### 4/5 — ЕДИНСТВЕННОЕ НА ДАННЫЙ МОМЕНТ РАБОЧЕЕ РАЗШИРЕНИЕ НА АЙФОН

*2024-12-30, version 3.5*

Просто работает.  А так же скрывает пустоту от удалённого банера

### 5/5 — Perfeito

*2024-08-27, version 3.5*

Fácil de operar e faz totalmente o que promete. Muito bom mesmo.

### 1/5 — :(

*2024-06-01, version 3.5*

It is not up to date and I did not see much use for it. It doesn't block ads. Please let me know if there is anything I don't know.

### 1/5 — Does not block youtube ads

*2024-02-25, version 3.5*

Does not block youtube ads

### 5/5 — O básico perfeito

*2023-12-12, version 3.5*

O melhor Ad block que achei sem dúvidas, simples e fácil de operar, além de ser muito leve!! Show de bola

## Frequently asked questions about Ka

### What does Ka-Block! do?

Ka-Block! is a content blocker designed for Safari. It works by preventing ads and tracking scripts from loading on the websites you visit. This process helps to speed up page loading times, reduce the amount of data you consume, and extend your device's battery life.

### What are the key features of Ka-Block!?

Key features include a fast, curated filter list for effective blocking, an open-source nature which promotes transparency, and the ability to block ads and tracking scripts. It also offers improved page load times, reduced data usage, and better battery life for your device.

### Is Ka-Block! free to use?

Yes, Ka-Block! is a free application. There are no costs associated with downloading or using its core content blocking features. The app does not have in-app purchases or display advertisements.

### What devices is Ka-Block! compatible with?

Ka-Block! is available for Safari on iOS devices. It is also mentioned as being available for Safari on Mac, indicating broader compatibility for users across Apple platforms.

### How does this app improve my browsing experience?

By blocking ads and tracking scripts, the app significantly speeds up how quickly web pages load. This reduction in background processes also leads to less data being downloaded and less battery power being consumed, providing a smoother and more efficient browsing experience.

## Version history (last 5 releases)

### 3.5 — 2021-11-06

Updates to the filter list.

### 3.4 — 2020-12-01

Updates to the filter list.

### 3.3 — 2019-10-06

Updates to the filter list.

### 3.2 — 2018-09-25

Updates to the filter list.

### 3.1 — 2018-02-05

Updates to the filter list.

## Apps similar to Ka

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Ad Block Multi](https://appshunter.io/ios/app/ad-block-multi/id1037619477) | 4.5 (839) | $0.99 | Utilities |
| [Ad Blocker ·](https://appshunter.io/ios/app/ad-blocker/id1514739120) | 4.5 (5,973) | Free | Utilities |
| [Ad Blocker VPN & DNS – Blokada](https://appshunter.io/ios/app/ad-blocker-vpn-and-dns-blokada/id1508341781) | 3.9 (9,468) | Free | Utilities |
| [Search Ace - AI Browser](https://appshunter.io/ios/app/search-ace-ai-browser/id1510267499) | 4.6 (574) | Free | Utilities |
| [1Blocker: Ad Blocker](https://appshunter.io/ios/app/1blocker-ad-blocker/id1365531024) | 4.5 (12,539) | Free | Utilities |
| [Adblocker For YouTube Videos](https://appshunter.io/ios/app/adblocker-for-youtube-videos/id1621531549) | 4.5 (1,528) | $2.99 | Utilities |

## Related topics

[blooker](https://appshunter.io/ios/topics/blooker)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-27.*