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Mosaic (web browser)

NCSA Mosaic
NCSA Mosaic 3.0 for Windows
Developer(s) NCSA
Initial release 0.5 / January 23, 1993 (1993-01-23)[1]
Discontinued 3.0 / 1997 (1997)
Development status Historical
Written in C[2]
Platform Windows, Unix, Amiga, Macintosh
Available in English
Type Web browser
License Proprietary
Website /mosaic/

NCSA Mosaic, or simply Mosaic, is the web browser credited with popularizing the World Wide Web. It was also a client for earlier protocols such as FTP, NNTP, and gopher. The browser was named for its support of multiple internet protocols.[3] Its intuitive interface, reliability, Windows port and simple installation all contributed to its popularity within the web, as well as on Microsoft operating systems.[4] Mosaic was also the first browser to display images inline with text instead of displaying images in a separate window.[5] While often described as the first graphical web browser, Mosaic was preceded by WorldWideWeb, the lesser-known Erwise[6] and ViolaWWW.

Mosaic was developed at the National Center for Supercomputing Applications (NCSA)[5] at the University of Illinois Urbana-Champaign beginning in late 1992. NCSA released the browser in 1993,[7] and officially discontinued development and support on January 7, 1997.[8] However, it can still be downloaded from NCSA.[9]

Netscape Navigator was later developed by Netscape, which employed many of the original Mosaic authors; however, it intentionally shared no code with Mosaic. Netscape Navigator's code descendant is Mozilla Firefox.[10]

Twenty years after Mosaic's introduction, the most popular contemporary browsers, Google Chrome, Internet Explorer, Safari, and Mozilla Firefox retain many of the characteristics of the original Mosaic graphical user interface (GUI), such as the URL bar and forward/back/reload buttons, and interactive experience.


  • Background 1
  • Licensing 2
  • Immediate effect 3
  • Importance of Mosaic 4
  • End of Mosaic 5
  • Features 6
  • See also 7
  • References 8
  • Further reading 9
  • External links 10


Mosaic 1.0 running under System 7.1, displaying the Mosaic Communications Corporation (later Netscape) website.

David Thompson tested ViolaWWW and showed the application to Marc Andreessen.[11] Andreessen and Eric Bina originally designed and programmed NCSA Mosaic for Unix's X Window System called xmosaic.[5][7][11][12] Funding for the development of Mosaic came from the High-Performance Computing and Communications Initiative, a program created by the High Performance Computing and Communication Act of 1991.[13]

Development of Mosaic began in December 1992. Marc Andreessen announced the project on Jan 23, 1993.[14] The first alpha release (numbered 0.1a) was published in June 1993, and the first beta release (numbered 0.6b) followed quickly thereafter in September 1993.[15] Version 1.0 (NCSA Mosaic for X 2.0) was released on November 11, 1993.[16] A port of Mosaic to the Commodore Amiga was available by October 1993. Ports to Windows and Macintosh had already been released in September.[11] An Acorn Archimedes port was underway in May 1994.

NCSA Mosaic 3.0

Marc Andreessen, the leader of the team that developed Mosaic, left NCSA and, with James H. Clark, one of the founders of Silicon Graphics, Inc. (SGI), and four other former students and staff of the University of Illinois, started Mosaic Communications Corporation. Mosaic Communications eventually became Netscape Communications Corporation, producing Netscape Navigator.

Spyglass licensed the technology and trademarks from NCSA for producing their own web browser but never used any of the NCSA Mosaic source code.[17] Microsoft licensed Spyglass Mosaic in 1995 for US$2 million, modified it, and renamed it Internet Explorer.[18] After a later auditing dispute, Microsoft paid Spyglass $8 million.[18][19][20] Versions of Internet Explorer before version 7 stated "Based on NCSA Mosaic" in the About box. Internet Explorer 7 was audited by Microsoft to ensure that it contained no Mosaic code, and thus no longer credits Spyglass or Mosaic.


The licensing terms for NCSA Mosaic were generous for a proprietary software program. In general, non-commercial use was free of charge for all versions (with certain limitations). Additionally, the X Window System/Unix version publicly provided source code (source code for the other versions was available after agreements were signed). Despite persistent rumors to the contrary, however, Mosaic was never released as open source software during its brief reign as a major browser; there were always constraints on permissible uses without payment.

As of 1993, license holders included:[21]

  • Amdahl Corporation
  • Fujitsu Limited (Product: Infomosaic, a Japanese version of Mosaic. Price: Yen5,000 (approx US$50)
  • InfoSeek Corporation (Product: No commercial Mosaic. May use Mosaic as part of a commercial database effort)
  • Quadralay Corporation (Consumer version of Mosaic. Also using Mosaic in its online help and information product, GWHIS. Price: US$249)
  • Quarterdeck Office Systems Inc.
  • The Santa Cruz Operation Inc. (Product: Incorporating Mosaic into "SCO Global Access," a communications package for Unix machines that works with SCO's Open Server. Runs a graphical e-mail service and accesses newsgroups.)
  • SPRY Inc. (Products: A communication suite: Air Mail, Air News, Air Mosaic, etc. Also producing Internet In a Box with O'Reilly & Associates. Price: US$149–$399 for Air Series.)
  • Spyglass Inc. (Product: Relicensing to other vendors. Signed deal with Digital Equipment Corp., which would ship Mosaic with all its machines.)

Immediate effect

Other browsers existed during this period, notably Erwise, ViolaWWW, MidasWWW, tkWWW and Cello. These browsers, however, would not have the same effect as Mosaic on public use of the Internet.[22]

In the October 1994 Issue of Wired, Gary Wolfe notes in the article, "The (Second Phase of the) Revolution Has Begun: Don't look now, but Prodigy, AOL, and CompuServe are all suddenly obsolete - and Mosaic is well on its way to becoming the world's standard interface":

Importance of Mosaic

Mosaic provided a key layer that enabled the internet to be more easily used.

Mosaic was the web browser which led to the Internet boom of the 1990s. Robert Reid underscores this importance stating, "while still an undergraduate, Marc wrote the Mosaic software ... that made the web popularly relevant and touched off the revolution" (p.xlii). Reid notes that Andreessen's team hoped:

... to rectify many of the shortcomings of the very primitive prototypes then floating around the Internet. Most significantly, their work transformed the appeal of the Web from niche uses in the technical area to mass-market appeal. In particular, these University of Illinois students made two key changes to the Web browser, which hyper-boosted its appeal: they added graphics to what was otherwise boring text-based software, and, most importantly, they ported the software from so-called Unix computers that are popular only in technical and academic circles, to the Windows operating system, which is used on more than 80 percent of the computers in the world, especially personal and commercial computers.(p.xxv).

Mosaic was not the first web browser for Windows; this was Thomas R. Bruce's little-known Cello. The Unix version of Mosaic was already making it famous before the Windows and Mac versions came out. Other than displaying images embedded in the text rather than in a separate window, Mosaic did not in fact add many features to the browsers on which it was modeled, like ViolaWWW.[5] But Mosaic was the first browser written and supported by a team of full-time programmers, which was reliable and easy enough for novices to install, and the inline graphics proved immensely appealing. Mosaic made the Web accessible to the ordinary person for the first time and had already 53% market share in 1995.[24]

Reid also refers to Matthew K. Gray's well-respected website, Internet Statistics: Growth and Usage of the Web and the Internet, which indicates a dramatic leap in web use around the time of Mosaic's introduction (p.xxv).

In addition, David Hudson concurs with Reid, noting that:

Marc Andreessen's realization of Mosaic, based on the work of Berners-Lee and the hypertext theorists before him, is generally recognized as the beginning of the web as it is now known. Mosaic, the first web browser to win over the Net masses, was released in 1993 and made freely accessible to the public. The adjective phenomenal, so often overused in this industry, is genuinely applicable to the... 'explosion' in the growth of the web after Mosaic appeared on the scene. Starting with next to nothing, the rates of the web growth (quoted in the press) hovering around tens of thousands of percent over ridiculously short periods of time were no real surprise (p.42).

Ultimately, web browsers such as Mosaic became the killer applications of the 1990s. Web browsers were the first to bring a graphical interface to search tools the Internet's burgeoning wealth of distributed information services. A mid-1994 guide lists Mosaic alongside the traditional, text-oriented information search tools of the time, Archie and Veronica, Gopher, and WAIS[25] but Mosaic quickly subsumed and displaced them all. Joseph Hardin, the director of the NCSA group within which Mosaic was developed, said downloads were up to 50,000 a month in mid-1994.[26]

By November 1992, there were 26 websites in the world[27] and each one attracted attention. In its release year of 1993, Mosaic had a What's New page, with about one new link per day. This was a time when access to the Internet was expanding rapidly outside its previous domain of academia and large industrial research institutions. Yet it was the availability of Mosaic and Mosaic-derived graphical browsers themselves that drove the explosive growth of the Web to over 10,000 sites by Aug 1995 and millions by 1998.[28] Metcalf expressed the pivotal role of Mosaic this way:

End of Mosaic

Mosaic's popularity as a separate browser began to lessen upon the release of Andreessen's Netscape Navigator in 1994. This was noted at the time in The HTML Sourcebook: The Complete Guide to HTML.[30]

By 1998 its user base had almost completely evaporated, being replaced by other web browsers. After NCSA stopped work on Mosaic, development of the NCSA Mosaic for the X Window System source code was continued by several independent groups. These independent development efforts include mMosaic (multicast Mosaic)[31] which ceased development in early 2004, and Mosaic-CK and VMS Mosaic.

VMS Mosaic, a version specifically targeting OpenVMS operating system, was one of the longest-lived efforts to maintain Mosaic. Using the VMS support already built-in in original version (Bjorn S. Nilsson ported Mosaic 1.2 to VMS in the summer of 1993),[32] developers incorporated a substantial part of the HTML engine from mMosaic, another defunct flavor of the browser.[33] As of 3 September 2003, VMS Mosaic supports HTML 4.0, OpenSSL, cookies, and various image formats including GIF, JPEG, PNG, BMP, TGA, TIFF and JPEG 2000 image formats.[34] The browser works on VAX, Alpha, and Itanium platforms.[35]

Another long-lived version of Mosaic – Mosaic-CK, developed by Cameron Kaiser – saw its last release (version 2.7ck9) on July 11, 2010.[36] The stated goal of the project is "Lynx with graphics" and runs on Mac OS X, Power MachTen, Linux and other compatible Unix-like OSs.[36]


Mosaic was based on the libwww library[37][38][39] and thus supported a wide variety of internet protocols included in the library: Archie, FTP, gopher, HTTP, NNTP, telnet, WAIS.[7]

See also


  1. ^ Stewart, William. "Mosaic -- The First Global Web Browser". Retrieved 22 February 2011. 
  2. ^ "xmosaic 1.2 source code". NCSA. 1994-06-29. Retrieved 2009-06-02. 
  3. ^  
  4. ^ Andreessen, Marc. "Mosaic -- The First Global Web Browser". Retrieved 2006-12-16. 
  5. ^ a b c d Berners-Lee, Tim. "What were the first WWW browsers?".  
  6. ^ Holwerda, Thom (3 Mar 2009). "The World's First Graphical Browser: Erwise".  
  7. ^ a b c Vetter, Ronald J. (October 1994). "Mosaic and the World-Wide Web".  
  8. ^ "Exhibits - Internet History - 1990's". Computer History Museum. 2006. Retrieved 2006-12-16. 
  9. ^ "Mosaic FTP". NCSA. Retrieved 30 May 2010. 
  10. ^ Clark, Jim (1999). Netscape Time. St. Martin's Press. 
  11. ^ a b c Berners-Lee, Tim (ca. 1993/1994). "A Brief History of the Web".  
  12. ^ Andreessen, Marc; Bina, Eric (1994). "NCSA Mosaic: A Global Hypermedia System". Internet Research (Bingley, U.K.: Emerald Group Publishing Limited) 4 (1): 7–17.  
  13. ^ "Vice President Al Gore's ENIAC Anniversary Speech". February 14, 1996. Retrieved July 27, 2009. 
  14. ^ "NCSA X Mosaic 0.5 released". Retrieved 2013-07-06. 
  15. ^ "The History of NCSA Mosaic". NCSA. Retrieved 2013-04-22. 
  16. ^ "The History of NCSA Mosaic". NCSA. Retrieved dbd2013-04.  ; "About NCSA Mosaic". NCSA. Retrieved dbd2013-04.  ; "NCSA Mosaic for X 2.0 available". Retrieved 2013-07-06. 
  17. ^ Sink, Eric (2003-05-15). "Memoirs From the Browser Wars". Eric Sink's Weblog. Retrieved 2006-12-16. 
  18. ^ a b  
  19. ^ Elstrom, Peter (22 January 1997). "MICROSOFT'S $8 MILLION GOODBYE TO SPYGLASS".  
  20. ^ The 1995 user guide The HTML Sourcebook: The Complete Guide to HTML, specifically states in a section called Coming Attractions, that Explorer "will be based on the Mosaic program" (p. 331).
  21. ^ "The (Second Phase of the) Revolution Has Begun". 
  22. ^ "A Little History of the World Wide Web From 1960s to 1995".  
  23. ^ Wolfe, Gary (October 1994). "The (Second Phase of the) Revolution Has Begun". Wired Magazine. Retrieved 2006-12-16. 
  24. ^ Cockburn, Andy; Jones, Steve (6 December 2000). "Which Way Now? Analysing and Easing Inadequacies in WWW Navigation".  
  25. ^ Lucey, Sean (9 May 1994). "Internet tools help navigate the busy virtual highway.". MacWeek: 51. 
  26. ^ Levitt, Jason (9 May 1994). "A Matter of Attribution: Can't Forget to Give Credit for Mosaic Where Credit is Due". Open Systems Today: 71. 
  27. ^ http. // Retrieved on 2014-06-16.
  28. ^ Web Server Survey | Netcraft. Retrieved on 2014-06-16.
  29. ^ Roads and Crossroads of Internet History Chapter 4: Birth of the Web
  30. ^ Ian S. Graham, "Coming Attractions" section, The HTML Sourcebook: The Complete Guide to HTML, p. 332. "Netscape Communications has designed an all-new WWW browser Netscape, that has significant enhancements over the original Mosaic program."
  31. ^ dauphin, Gilles (1996). "W3C mMosaic". World Wide Web Consortium. Retrieved 2007-11-02. 
  32. ^ Nilsson, Bjorn (1993). "README.VMS". National Center for Supercomputing Applications. Retrieved 2007-11-02. 
  33. ^ NCSA and VMS Mosaic Version Information
  34. ^ " - OpenVMS Community Portal (VMS Mosaic V4.2)". 2007. Retrieved 2007-11-02. 
  35. ^ "Mosaic 4.0 freeware_readme.txt". Hewlett-Packard Development Company, L.P. 2006. Retrieved 2007-11-02. 
  36. ^ a b "Official Mosaic-CK homepage". 
  37. ^ Kahan, José (7 June 2002). "Change History of libwww".  
  38. ^ Petrie, Charles;  
  39. ^ Kahan, José (5 August 1999). "Why Libwww?". Retrieved 15 June 2010. 

Further reading

  • Andreessen, Marc & Bina, Eric (1994). "NCSA Mosaic: A Global Hypermedia System". Internet Research: Electronic Networking Applications and Policy 4 (1): 7–17.  
  • Graham, Ian S. (1995). The HTML Sourcebook: The Complete Guide to HTML (First ed.). New York: John Wiley & Sons.  
  • Hudson, David (1997). Rewired: A Brief and Opinionated Net History. Indianapolis: Macmillan Technical Publishing.  
  • Reid, Robert H. (1997). Architects of the Web: 1000 Days That Built the Future of Business. New York: John Wiley and Sons.  
  • Tikka, Juha-Pekka (March 3, 2009). "The Greatest Internet Pioneers You Never Heard Of: The Story of Erwise and Four Finns Who Showed the Way to the Web Browser". Xconomy. 
  • Wolfe, Gary (October 1994). "The (Second Phase of the) Revolution Has Begun: Don't look now, but Prodigy, AOL, and CompuServe are all suddenly obsolete - and Mosaic is well on its way to becoming the world's standard interface".  

External links

  • Welcome to Mosaic Communications Corporation!
  • NCSA Mosaic -- September 10, 1993 Demo
  • NCSA Mosaic 1.0 home page at Déjà Vu (
  • Beyond the Web: Excavating the Real World Via Mosaic - early application of Mosaic
  • NCSA Mosaic for modern Linux systems at GitHub
  • NCSA Mosaic Archive
  • In The Beginning... - A history of the Windows development effort.
  • Mosaic archive on
  • Mosaic for OpenVMS systems
  • VMS Mosaic home page
  • Mosaic-CK home page
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