OmniWeb 5.6 under Mac OS X 10.5.0
|Developer(s)||The Omni Group|
|Initial release||March 17, 1995|
|5.11.2 (July 23, 2012[±])|
|6.0-r318604 (September 24, 2018) [±]|
|Operating system||Mac OS X 10.4.8 or later|
|Available in||English, Finnish, French, German, Italian, Japanese, Simplified Chinese, Swedish|
|License||Proprietary (browser), LGPL (WebKit)|
OmniWeb was a proprietary Internet web browser developed and marketed by The Omni Group, exclusively for Apple's macOS operating system. Though no longer maintained, it is still available as a free download.
OmniWeb was originally developed by Omni Group for the NeXTSTEP platform, and was released by Lighthouse Design on March 17, 1995 after only one month's development time. As NeXTSTEP evolved into OpenStep and then Mac OS X, OmniWeb was updated to run on these platforms. OmniWeb also was able to run on Microsoft Windows through the Yellow Box or the OpenStep frameworks. After Lighthouse Design was bought by Sun Microsystems, the Omni Group released the product themselves, from version 2.5 onwards. From version 4.0 onwards, OmniWeb was developed solely for the OS X platform.
OmniWeb was developed using the Cocoa API which allowed it to take full advantage of OS X features. It used Quartz to render images and smooth text. It did use multiple processors if available, and featured an interface that made use of Aqua UI features such as drawers, sheets, and customizable toolbars.
OmniWeb originally employed its own proprietary HTML layout engine that used standard API NSText components. However, this engine was very slow, particularly when scrolling, and was not fully compatible with the most recent web standards, such as Cascading Style Sheets. In OmniWeb version 4.5, the Omni Group adopted Apple's KHTML-based WebCore rendering engine, which was created by Apple for its Safari browser.
On August 11, 2004, the Omni Group released version 5.0 of OmniWeb which included a number of new features. The most notable feature was an unusual implementation of tabbed browsing, in which the tabs were displayed vertically in a drawer on the side of the window (including optional thumbnail pictures of the pages.) Despite a certain amount of controversy over the merits of a tab drawer over a tab toolbar, the feature persisted through the final version.
On September 7, 2006, version 5.5 was released. Major new features included the use of a custom version of WebKit instead of WebCore, universal binary support, saving to web archive, support for user-defined style sheets, a "Select Next Link" feature, FTP folder display, ad-blocking improvements, updated localizations, and many other small changes and bug fixes.
OmniWeb was Omni Group's flagship app but as OS X web browsers improved—Apple eventually bundled Safari into OS X— and Omni successfully introduced other products such as OmniGraffle and OmniOutliner, OmniWeb's importance diminished. OmniWeb's price was successively lowered, first to $39.95, then on February 24, 2009, Omni Group announced that OmniWeb would be made available for free, a change from its previous price of $14.95. The Omni Group official website now states that the browser is no longer under active development.
- Separate window form editing: Click the square in the upper right corner of multi line form fields to open it in a separate window. This helped when you wished to add lots of text to an area which is very small and you wanted to see all of it at once. This feature also allowed you to enter tab characters.
- Workspaces: groups of web browser windows and tabs in them. A user could have multiple workspaces for different web research topics and quickly switch between them with a key shortcut or menu choice.
- View Links: By clicking on this button in the toolbar, one could quickly view all the links contained in the page.
- Ad blocking: OmniWeb used a powerful pattern match ad blocking feature to stop images from loading from servers matching the pattern. It was also possible to block images that didn't originate from the current server you were browsing and to block images that match common advertisement sizes.
- Shortcuts: allowed one to type a key word or phrase to open a certain web site or begin a specific web search.
- Site-specific preferences: OmniWeb allowed you to specify preferences that apply to specific websites. For example, if you adjust the font size on a given web page, the adjusted font size would be used on all other pages of the same site. Preferences were saved automatically and retained between browsing sessions.
OmniWeb was popular in the early 2000s when the OmniGroup's experience developing for OpenStep (which became the foundation for Mac OS X) gave them an edge over other developers. Until Apple's Safari, OmniWeb had the best support for Mac OS X technologies among its competition (chiefly Mozilla Firefox and Internet Explorer for Mac). John Siracusa, a technology journalist and critic writing for Ars Technica, said, "Finding [this level of functionality] in a proper Mac OS X application from a respected developer with a proven track record is like finding a perfect 1/10,000th scale replica of the Eiffel Tower in a box of crackerjacks. Then the tower transforms into a tiny robot and makes you lunch." 
- List of web browsers
- Comparison of web browsers
- List of feed aggregators
- Comparison of feed aggregators
- "OmniWeb for Mac - Test Builds". omnistaging.omnigroup.com. September 24, 2018. Retrieved December 8, 2018.
- Sendall, Mike (March 29, 1995). "World Wide Web Clients". World Wide Web Consortium. Retrieved December 8, 2018.
- Berners-Lee, Tim (1993). "A Brief History of the Web". World Wide Web Consortium. Retrieved December 8, 2018.
- "OmniWeb Release Notes". Retrieved December 8, 2018.
Text is now displayed in our own custom view instead of a modified NSTextView.
- "MacEdition Guide to CSS2 Support in Mac-only Browsers: Notes on Pre-WebCore OmniWeb". May 17, 2003. Retrieved December 8, 2018.
- "OmniWeb 4.5 Beta 2 Released". July 7, 2003. Retrieved December 8, 2018.
- Gruber, John (February 2, 2004). "OmniWeb 5 Public Beta". Daring Fireball. Retrieved December 8, 2018.
- Hicks, Jon (April 27, 2006). "A quick guide to Omniweb 5.5 sp6". Hicksdesign. Retrieved December 8, 2018.
- Sharps, Linda (September 7, 2006). "OmniWeb 5.5 released". Retrieved December 8, 2018.
- Bailey, Jonathan. "Why OmniWeb Failed". Archived from the original on June 25, 2016. Retrieved December 8, 2018.
- NickM (November 25, 2008). "Will there ever be an Omniweb 6?". Retrieved December 8, 2018.
- Sharps, Linda (February 24, 2009). "OmniWeb, OmniDazzle, OmniDiskSweeper, and OmniObjectMeter now freeware". Retrieved December 8, 2018.
- Siracusa, John (February 4, 2004). "OmniWeb 5.0 Beta". Ars Technica. p. 6. Retrieved December 8, 2018.