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iCab 4.0 under Mac OS X 10.4.11
|Initial release||February 17, 1999|
|Stable release||5.5 (October 30, 2014[±])|
|Preview release||none (n/a) [±]|
|Operating system||Mac OS X, iOS (active),
Mac OS 7.5–9.2.2 (discontinued)
|Available in||English, German, French, Danish, Spanish, Russian, Norwegian, Chinese and Japanese|
iCab is a web browser for the Macintosh by Alexander Clauss, derived from Crystal Atari Browser (CAB) for Atari TOS compatible computers.  It was one of the few browsers that was still updated for the classic Mac OS; only Classilla is more recent. The downloadable product is fully functional, but is nagware—periodically displaying a dialog box asking the user to register the product, and upgrade to the "Pro" version.
iCab 2.9.8 runs natively on early versions of Mac OS X, but OS X compatible versions of iCab 2.x are no longer officially available for download.
iCab 5 was released on June 12, 2012. It runs on Mac OS 10.5 or later.
iCab's original rendering engine was often criticized for not supporting CSS and DOM. iCab 3 introduced improved rendering capabilities, including support for CSS2 and Unicode (via the ATSUI toolkit). iCab 4 switched to WebKit for its rendering engine, giving it the same rendering abilities as Apple's Safari browser.
On 7 June 2009, iCab 4.6, using the WebKit rendering engine, became the first desktop browser released to display a score of 100/100 and pass the Acid3 test. Apple's Safari 4 browser was released one day later and has been officially credited as being the first official release browser to pass the Acid3 test with a score of 100/100.
iCab features a filter manager which allows users to avoid downloading advertisements and other content. Currently iCab comes with two filters (advertisements and video). Other kinds of filters add features, such as the YouTube video filter which adds a download link on all YouTube page views.
iCab’s Download manager allows the user start, stop, resume and review downloads. It maintains a download history, supports downloading of an individual page, or a whole site (crawling) with many user selectable crawl-constraint options. It can save as portable web archives (a ZIP archive containing HTML, images and other files), or as individual files on the local hard drive.
iCab also contains the following features:
- Tabbed browsing.
- Multiple language support, including Arabic on older Macs (cannot display UTF-16 pages).
- Filtering out of images and plugin content (e.g. ads).
- Kiosk mode: full screen display and access controls.
- Acid2 test compliance.
- Configurable print dialog.
- History window which can sort by title, last access date, or URL.
- Hotlist (bookmark) mechanism which can automatically or manually check for updates to bookmarked sites.
- Reload a single image on a page without needing to reload the whole page.
- Disable web "annoyances" such as animated GIFs and embedded sound files.
- User agent spoofing (i.e. pretending to be another browser).
- Support for sessions (i.e. saving and then loading all open windows and tabs).
- Add any query (e.g., search engine, Wikipedia) to the toolbar search widget by point-and-click.
- List of web browsers
- Comparison of web browsers
- Comparison of layout engines
- Patting, Sebastian (2011-11-22). "Interview with Alexander Clauss, iCab's Creator". Low End Mac. Retrieved 2014-09-02.
- Smykil, Jeff (2009-07-13). "Browse the Web in style with Classilla for Mac OS 9". ArsTechnica. Retrieved 2014-09-02.
- Official website
- UnofficialFAQ (an iCab user group's wiki)
- THOUGHTS ON THE MEMORY EFFICIENCY OF iCab AND PROGRAMMING IN THE 80s by John A. Ardelli