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iCab

iCab is a developed for macOS by German programmer Alexander Clauss, first released in 1999 as a native application for Apple Macintosh computers. It originated from Clauss's earlier project, the Crystal Atari Browser (CAB), an offline viewer created in 1995–1996 for ST computers running the TOS operating system, which later evolved to support internet connectivity via plugins. Distinguished by its focus on user customization and efficiency, iCab includes built-in tools for filtering advertisements, pop-ups, and sites, alongside a , tabbed browsing, and a mode suitable for public or shared computer environments. The browser's development reflects the transition from to modern macOS, with multiple rewrites to adapt to new frameworks, including a shift from C++ to , integration with , and a complete rewrite in version 6.0 (2020) using the modern macOS web engine. Earlier versions supported macOS down to OS X 10.3.9 (), while versions from 6.0 onward (as of 2025) require macOS 10.13 (High ) or later. Priced at $10 or 10 EUR for full access, it operates in a limited free mode otherwise, emphasizing privacy features like automatic history deletion and ZIP-based storage of saved web pages. In addition to the desktop version, Clauss developed iCab Mobile, a companion browser for devices including , , and , launched to address limitations in Apple's default browser and gaining popularity after the iPad's introduction in 2010. Throughout its history, iCab has positioned itself as an "internet taxi" for users seeking alternatives to mainstream browsers, prioritizing configurability and niche functionalities over broad market dominance.

History

Origins from Atari

iCab's codebase traces its roots to the Crystal Atari Browser (CAB), a web browser developed by programmer Alexander Clauss for TOS-compatible computers in the mid-1990s. CAB was initially conceived around 1995/96 as an offline viewer for the ST, driven by Clauss's need to access HTML files from university resources and magazine CDs like those from c't at home, where no suitable existed for the platform. This early motivation highlighted the desire for a standards-compliant tool on non-PC systems, focusing on accurate rendering amid the dominance of proprietary extensions in mainstream browsers. As Internet adoption grew on systems, CAB evolved into a full-featured with support for connectivity. By version 2.8, it incorporated 3.2 standards along with extensions from 3.0 (including frames) and , enabling clean rendering of web content without relying heavily on platform-specific quirks. The 's plugin architecture allowed integration with emerging TCP/IP and software, addressing the initial limitations of Atari's networking capabilities. Development on the of the presented foundational technical challenges, including resource constraints and the need to build parsing and rendering engines from the ground up in a constrained environment. These efforts laid the groundwork for CAB's portability, though the 68k-optimized code to other systems later required adaptations for differing and operating environments. This foundation influenced iCab's emphasis on efficiency and compliance when transitioning to the platform.

Development for Mac OS

iCab's development for Mac OS began as a port of the , originally created for systems, adapted by German developer Alexander Clauss to target Macintosh hardware and software environments. The first public release occurred on February 17, 1999, for , with compatibility starting from System 7.5 and extending to later versions up to Mac OS 9.2. Clauss undertook the project as a solo effort, handling all aspects of coding, testing, and distribution without a , which allowed for rapid iteration but limited the scope compared to larger projects. To commercialize iCab, Clauss established it as , available for free download but prompting users with occasional remainder boxes (nagware) encouraging registration for $29, a model that supported ongoing while providing full functionality to trial users. Early versions emphasized standards compliance to stand out amid Internet Explorer's dominance on the Mac platform, incorporating partial support for CSS Level 1 and basic DOM Level 1 features, which enabled better rendering of standards-based web content than many contemporaries at the time.

Key milestones and updates

iCab 3, developed between 2003 and 2008, marked a significant advancement in rendering capabilities with the introduction of CSS2 support, enabling more sophisticated web page styling and layout options compared to prior versions. This version also incorporated support via Apple's ATSUI toolkit, facilitating better handling of international text and multilingual content. These enhancements positioned iCab as a robust browser for Mac users seeking improved standards compliance during that era. In 2008, iCab 4 underwent a pivotal engine transition to , Apple's open-source rendering framework, which dramatically boosted performance, execution, and overall web compatibility. On June 7, 2009, iCab 4.6 achieved a perfect score on the test, demonstrating full adherence to web standards in rendering, scripting, and DOM manipulation ahead of major competitors on the platform. The release of iCab 5 in 2012 extended support to Mac OS X 10.5 and later, incorporating refinements to integration and user features while maintaining for older hardware. iCab 6 arrived on September 28, 2020, rebuilt to leverage macOS 10.13 and subsequent versions, including High Sierra and beyond, with optimizations for modern and architectures. The most recent stable update, version 6.3.6 on November 16, 2025, includes syncing (introduced in version 6.0) for tabs, bookmarks, and content filters, enabling seamless synchronization across macOS devices and integration with iCab Mobile. Alexander Clauss has continued sole maintenance of iCab, ensuring ongoing with macOS updates such as (macOS 15) and later versions as of 2025, while expanding multilingual support to include languages like and others through regular localized builds. This dedication has sustained iCab's relevance as a lightweight, privacy-focused amid evolving web technologies up to 2025.

Features

Rendering and

iCab's early versions, from its debut in 1999 through iCab 3, relied on a custom rendering engine developed by its creator, Alexander Clauss, which initially offered limited support for web standards such as CSS and the (DOM). These versions prioritized lightweight performance on but faced criticism for incomplete compliance with emerging standards, though iCab 3 introduced enhancements including CSS2 support and Unicode rendering via Apple's ATSUI toolkit. Beginning with iCab 4 in 2008, the browser transitioned to Apple's rendering engine, replacing the proprietary codebase to achieve fuller adherence to modern web standards. This shift enabled robust support for , CSS3, and , with iCab 4 and later versions passing the test at 100/100, a benchmark for standards compliance including DOM, , and execution. The adoption of also facilitated features like handling and SSL certificate inspection, allowing users to view certificate chains and details directly within the browser interface. Regarding hardware and platform compatibility, early iCab releases were optimized for Macintosh systems, with versions up to 2.9.9 supporting 68k processors and PowerPC architectures running System 7.5 through Mac OS 9.2.2, often requiring as little as 2.7 MB of on 68k machines. Subsequent updates maintained where possible, while iCab 4 onward targeted OS X 10.3.9 and later, including -based systems. In recent iterations, such as iCab 6.3.6 (November 2025), the browser supports macOS 10.13 and later, including and (M-series) systems, leveraging the system's native implementation for enhanced performance and security features like sandboxing to isolate web content. iCab also includes spoofing as an extension to improve rendering compatibility on sites that detect and block non-standard browsers.

User interface and usability

iCab's user interface emphasizes simplicity and customization, allowing users to tailor the browsing experience to their preferences. The browser supports tabbed browsing, where users can open multiple pages within a single window and manage them through drag-and-drop reordering for efficient navigation. Customizable toolbars enable the rearrangement of buttons and menus, with options to apply site-specific configurations based on URLs, enhancing across different websites. A full-screen kiosk mode provides a distraction-free environment by hiding interface elements and restricting access to other applications, making it suitable for public or shared computing scenarios such as kiosks at events or hotels. This mode can be further restricted to specific pages or domains for controlled access. For security and comfort, iCab includes a built-in filter manager that blocks advertisements and pop-up windows, reducing clutter and improving page load times without relying on external extensions. Users can spoof the browser's user agent string to mimic other browsers, aiding compatibility with sites that detect and restrict certain user agents. Additionally, integration with Google's Safe Browsing API delivers real-time warnings for malware and phishing sites, alerting users before loading potentially harmful content. Earlier versions of the interface supported multiple languages, including English, , , , Danish, , , , , and , allowing localization for diverse users. The current version (iCab 6.3.6) supports English, , and Danish. Accessibility features include compatibility with macOS's , with added labels in the sidebar and other elements to support visually impaired users. Leveraging the rendering engine contributes to smooth and responsive UI performance across these features.

Advanced tools and customization

iCab's enables users to handle file downloads with resume support, allowing interrupted transfers to be continued seamlessly, and extends to capturing entire web pages for offline access by archiving them, including associated images and resources, into compact files. This feature is particularly useful for power users needing to preserve content without relying on external tools. The browser incorporates an source viewer and editor that supports direct modification of page code within the application, featuring auto-reload to instantly refresh and display changes upon saving, which facilitates and debugging for web developers. For advanced development workflows, iCab provides built-in tools such as the Web Inspector for real-time examination of page rendering and network activity, the DOM Inspector for in-depth analysis of the structure, and a debugger paired with a console for error logging and script execution control. These utilities, leveraging the underlying engine, offer developers a comprehensive suite without needing separate extensions. Customization in iCab caters to power users through its Filter Manager, which supports rule-based blocking compatible with formats, including import and auto-update of popular lists like EasyList and for targeted ad and tracker suppression. Users can define granular filter rules by URL patterns, dimensions, or content types to tailor content display. Additionally, the browser allows CSS-based injections via advanced filter syntax, such as :has-text() and :upwards() selectors, enabling site-specific stylistic tweaks, while can be selectively disabled or managed per for enhanced control. Settings, including filters, bookmarks, and tabs, synchronize across devices via for consistent customization.

Versions

Classic Mac OS support

iCab provided extensive support for , catering to both 68k and PowerPC-based Macintosh systems through dedicated versions optimized for the era's hardware limitations. The browser's 2.9.9 release, finalized in May 2006, served as the last version compatible with 68k processors on Mac OS 7.5 to 8.1, while also supporting PowerPC systems running Mac OS 7.5 through 9.2.2. This version emphasized efficient resource usage, making it suitable for older machines with limited and processing power, and operated under a model that included periodic nagware reminders to encourage registration. The iCab 3.x series extended support for PowerPC-equipped , with version 3.0.5—released on January 1, 2008—marking the final update for Mac OS 8.5 to 9.2.2. This series introduced enhanced rendering capabilities, including partial support for CSS2 standards, allowing better handling of styled compared to earlier iterations, though it fell short of full with emerging modern web specifications like advanced or complete HTML4 features. Like its predecessors, iCab 3.x maintained a lightweight footprint to ensure smooth performance on aging hardware, while retaining the structure with reminder prompts. The 3.x releases also bridged to early macOS by supporting OS X 10.1 and later, signaling the gradual end of dedicated development.

macOS versions

iCab 4, released in early 2008, marked a significant overhaul for the browser on Mac OS X, adopting the framework and Apple's rendering engine for enhanced performance and compatibility with modern web standards. It supported Mac OS X 10.3.9 and later versions on both PowerPC and -based systems, enabling native execution on Macs and full integration with features like Leopard's user interface. This version introduced improved rendering fidelity akin to while retaining iCab's distinctive customization options, such as advanced ad-blocking and download management. iCab 5 debuted on June 12, 2012, targeting Mac OS X 10.5 Leopard and subsequent releases, with a focus on bolstering overall stability through refined WebKit integration and bug resolutions. Subsequent updates in the series, such as 5.8 in February 2017 and 5.9 in February 2020, extended support to macOS 10.11 El Capitan and 10.13 High Sierra respectively, incorporating features like reader mode and notarization for macOS Catalina to ensure reliable operation amid evolving security requirements. These enhancements addressed rendering inconsistencies and crash issues reported in prior iterations, making iCab 5 a dependable choice for users on older macOS versions without sacrificing core functionalities. The iCab 6 series launched on September 28, 2020, with version 6.0, requiring macOS 10.13 High Sierra or later to leverage contemporary macOS APIs for better efficiency and security. This iteration introduced synchronization for tabs, bookmarks, reading lists, filters, and search engines, facilitating seamless cross-device experiences. Ongoing updates have prioritized stability via extensive bug fixes, with the series achieving compatibility with macOS 15 Sequoia through releases like 6.3.6 on November 16, 2025, which resolved a bug in web archive loading and optimized performance on both and architectures. The adoption of updated components in iCab 6 further aligned it with Apple's ecosystem advancements, ensuring robust support for and privacy features without compromising the browser's unique tools.

Platform transitions

iCab originated as a port of the , developed by for ST computers running TOS in the mid-1990s, before transitioning to the platform in 1999 amid the decline of the ecosystem. The initial version, iCab 1.0, targeted on PowerPC hardware, marking a complete rewrite from the codebase to leverage Macintosh-specific while retaining core features. This shift allowed iCab to support both 68k and PowerPC processors under through 9.2.2, with version 2.9.9 in May 2006 serving as the final release compatible with 68k systems, after which development focused exclusively on PowerPC for . The transition to Mac OS X began with iCab 3.0 in 2005, which introduced native support for the new operating system alongside continued compatibility for on PowerPC machines up to version 3.0.5, released in 2008 as the last update for that environment. This era involved significant challenges, including maintaining dual compatibility across Carbon APIs for and for OS X, while addressing rendering inconsistencies during the transition period. iCab 4.0 in 2008 pivoted fully to OS X 10.3.9 and later, adopting the engine and becoming a for both PowerPC and early processors, which resolved prior custom engine limitations but required dropping support entirely. Subsequent updates further streamlined hardware support amid Apple's shifts. iCab 5.1.1 in 2013 was the last to accommodate PowerPC (G3, G4, G5) alongside under OS X 10.5 to 10.7, after which version 5.2 in discontinued PowerPC compatibility to align with Intel-only architectures starting from OS X 10.6. By iCab 6.0 in 2020, the browser underwent another complete rewrite to integrate modern features, raising the minimum requirement to macOS 10.13 and extending native support to (M-series) processors while ending compatibility with pre-10.13 systems and older models without 64-bit support. These changes emphasized macOS as iCab's exclusive desktop platform by the early 2020s, prioritizing performance on contemporary hardware over legacy maintenance.

iCab Mobile

Development and platform support

iCab Mobile was initially released on April 21, 2009, as version 1.0, marking it as one of the earliest third-party web browsers for devices, developed by Clauss, the same creator behind the desktop iCab browser for . Designed specifically for the and later expanded to support starting in 2010, the browser was originally priced at $1.99 on the but increased to $2.99 as of 2025. Throughout its history, iCab Mobile has received regular updates to ensure compatibility with evolving and versions, culminating in version 11.2.2 released on November 7, 2025, which includes support for iOS 15.0 and later, with features tailored for iOS 26 and subsequent versions. The app's rendering engine has relied on Apple's framework from the outset, with a significant evolution in version 10.0 (September 28, 2020) that transitioned exclusively to the modern WebKit implementation, dropping legacy engine options to align with + requirements and beyond. Platform adaptations have extended to the , integrated since version 8.9 on July 8, 2015, enabling basic functionality on the wearable . A major developmental milestone occurred with version 11.0 on December 20, 2024, which involved a complete rewrite using the latest technologies, introducing enhanced multi-user profile support tailored for multitasking features like split-screen and Stage Manager. These updates reflect Clauss's ongoing commitment to adapting the browser to Apple's ecosystem advancements while preserving its core third-party status.

Core features

iCab Mobile incorporates custom gestures to facilitate intuitive navigation on touch interfaces, allowing users to configure actions such as swiping to switch tabs, pinching to , or specific patterns to commands like opening links in new tabs. These gestures extend to multi-finger taps for quick access to context menus and toolbars, enhancing usability without relying on on-screen buttons. The supports tab groups that enable users to organize multiple thematically, complete with previews for easy identification and switching, alongside options for and protected tabs to prevent accidental closure. Additionally, a built-in reader mode processes web content locally to strip away distractions, presenting articles in a customizable format with adjustable font sizes, color schemes, and even speech output for . For file handling, iCab Mobile features a robust that organizes files with previews, supports ZIP archiving, and integrates with the Document Picker for seamless sharing to cloud services or other apps. is achieved through filter lists including Easylist, , and , with options for custom rules to hide ads and trackers; proxy configurations allow users to set up custom servers with credential support for secure . Privacy is bolstered by tools such as domain-specific filters that block or accept selectively, SSL inspection to verify site security, and site-specific adjustments for levels and font sizes to tailor viewing without altering global settings. iCab Mobile also offers for bookmarks, tabs, and filters, ensuring with the version of iCab.

Recent enhancements

iCab Mobile underwent significant updates starting in late 2024, with version 11.0 released on December 20, 2024. This major overhaul included a redesigned for improved , support for multiple user profiles that allow cloning of existing profiles to preserve bookmarks and settings, and a complete reprogramming of the app to leverage the latest technologies for enhanced performance and easier future maintenance. Building on this foundation, version 11.1.0 arrived on September 15, 2025, introducing that enables users to interact with pages using Apple Intelligence queries directly from the or action menu, as well as generating descriptions and keywords for to support smart folder organization. These enhancements aim to streamline web interactions and personalize management without requiring external tools. The most recent update, version 11.2.2 on November 7, 2025, focused on refining and compatibility, adding options for opaque backgrounds on pop-up menus to improve readability under 26.1, full-screen mode defaults for new profiles configurable by admins, and Touch ID-based hiding of the in full-screen views on iPhones. It also addressed playback reliability for embedded videos, introduced export and import functionality for groups via the , and provided new controls for elements. These changes enhance privacy, multitasking, and visual consistency across devices.

References

  1. [1]
    iCab - The Taxi for the Internet
    iCab is an alternative web browser for the Apple Mac with numerous useful features not found in other browsers. iCab is shareware and costs $10 / 10 EUR, ...Downloads · Order iCab · FAQ · History
  2. [2]
    Interview with Alexander Clauss, iCab's Creator - Low End Mac
    Nov 22, 2011 · 2011 – Alexander Clauss is the developer of iCab, an alternative web browser from Germany. iCab has been around since 1999 and is available ...
  3. [3]
    History - iCab
    Since macOS 12 iCab can also include the back/forward history when saving the browser session session; The "Dock" menu can be now also used to directly open a ...
  4. [4]
    iCab Mobile - The Internet Taxi for the iPhone, iPad and Apple Watch
    iCab Mobile is a web browser for the iPhone and the iPad. It provides many features which makes surfing in the web much easier.
  5. [5]
    CAB - Web-Browser - Atari-Software - Alexander Clauss
    CAB is capable of reading HTML format documents. CAB 2.8 supports HTML 3.2, all HTML extensions of Netscape Navigator 3.0 (inclunding Frames) and many ...Missing: origins | Show results with:origins
  6. [6]
    ICab Web Browser - SiliconPin Topics
    The full history of iCab is a story of resilience. It survived the browser wars, the transition from classic Mac OS to OS X, and the mobile revolution not ...
  7. [7]
    iCab (Classic) - Macintosh Repository
    System Requirements. From Mac OS 7.5 up to Mac OS 9.2. Compatibility notes. Version 2.99b is the last 68K version for System 7.5 to 8.1. Version 3.05 is the ...
  8. [8]
    German program is only for Mac; iCab: A preview version avoids the ...
    Mar 29, 1999 · Both require System 7.5 or later, 4MB of free RAM, Thread Manager and Internet Config, both of which have been incorporated into Mac OS 8.5. All ...
  9. [9]
    Order - iCab
    The software "iCab" can be downloaded for free and can be used for free. Using it for free will only popup a shareware remainder box from time to time. When ...Missing: nagware | Show results with:nagware
  10. [10]
    A Promising New Browser - Low End Mac
    Have you heard about iCab, the new shareware Mac-only web browser from Germany? With Internet Exploder and Netscrape Communicator (sorry, I couldn't resist) ...Missing: nagware | Show results with:nagware
  11. [11]
    iCab 3 beta : Impressive - Michel Fortin
    Jul 20, 2005 · Today, I downloaded iCab 3 beta and got surprised by how well it support CSS 2, which seems to be as good as its rivals. Since this is the ...
  12. [12]
    FAQ - iCab
    iCab FAQ, October 2020. General Questions. After installing iCab 6.0.0 the downloads are failing. How can this be fixed? Am I able to block “pop-up” windows ...
  13. [13]
    iCab 4: Try It, You Might Like It - Low End Mac
    Jan 28, 2008 · iCab was born as CAB, a browser for the Atari ST, itself a moderately successful alternative to the Mac (much more successful in Europe than in ...Missing: clean proprietary extensions
  14. [14]
    Download Old Version of iCab [5.6.2 - 5.1.1 - 4.8...] for Mac
    Download the previous and older versions of iCab for Mac securely on MacUpdate - the biggest library of Mac apps since 1997.
  15. [15]
    iCab 3.0; CSS compatibility updated - QuirksBlog - QuirksMode
    iCab 3.0; CSS compatibility updated. iCab 3.0 is a surprisingly good, independent Mac (OS X and 9!) browser created by Alexander Clauss.Missing: history milestones
  16. [16]
    [PDF] Building a Browser for Automotive - Huihoo
    Sep 19, 2015 · Passing ACID3 with 100/100 tests since March 2008 ... Amazon Kindle. Arora. BOLT browser. Epiphany browser. Google Chrome. iCab (version >= 4).
  17. [17]
    https://www.icab.de/download.html
  18. [18]
    iCab, Pro and Con - Low End Mac
    Jun 1, 1999 · There are two versions of iCab, one for the PowerPC Macs, the other for earlier Macs. The 68k version will run in as little as 2.7 MB on any Mac ...Missing: hardware SSL
  19. [19]
    Siber-Sonic World O' iCab
    May 15, 2004 · Since iCab 4's move to WebKit as its engine, incompatibility issues are far fewer. Still, it helps support iCab to let iCab identify itself as ...Missing: custom DOM
  20. [20]
    iCab 4.0.1 - Macworld
    Rating 3.5 · Review by Joe KissellMar 5, 2008 · Version 4.0.1 is all about the present: it runs natively on Intel-based Macs, fully supports Leopard, and has a slick new user interface on the outside.Missing: early | Show results with:early
  21. [21]
    Adjusting user-agent strings to access Macintosh Garden
    Apr 8, 2023 · So, by changing the user-agent string, the website will think a browser is acceptable. iCab 2.99 has that option. I am wondering how it can ...Missing: spoofing | Show results with:spoofing
  22. [22]
    Downloads - iCab
    iCab Download. Which version should I download? The latest version of iCab is always recommended. But please check the system requirements, the latest ...
  23. [23]
    ICab 4.0: A Feature-Packed Reincarnation of the Venerable Mac ...
    Jan 3, 2008 · Once a compelling alternative to the feuding Netscape and IE browsers, iCab, a Mac-only web browser that largely fell by the wayside, has been ...Missing: 2009 | Show results with:2009
  24. [24]
    Review: iCab 4.0 Web browser for Apple's Mac OS X - MacDailyNews
    Jan 2, 2008 · iCab's customization possibilities (especially with the Filter Manager) definitely make it worthwile for me, and the new 4.x version removes ...Missing: advanced | Show results with:advanced
  25. [25]
    iCab for Mac - Free download and software reviews
    Jun 3, 2014 · iCab is an alternative web browser for the Apple Macintosh with numerous useful features not found in other browsers. Icon of program: iCab ...
  26. [26]
    iCab - Downloads
    ### iCab Versions Summary
  27. [27]
    History - iCab Mobile
    History. Version 11.2.1 (October, 16th 2025). When creating new User Profiles, it is now also possible to clone existing profiles (which includes bookmarks, ...
  28. [28]
    iCab – a little better Safari - Jablíčkář
    Nov 12, 2010 · The iCab Mobile browser offers you extended work with bookmarks (so-called tabs or panels), where you can set whether links will be ...
  29. [29]
    iCab Mobile (Web Browser) - App Store - Apple
    iCab Mobile is a web browser for iOS. iCab Mobile is customizable in almost all areas and can thus be made into your very own personal browser.Missing: ongoing maintenance multilingual