|Type of site||Answer engine|
|Owner||Wolfram Alpha LLC|
|Created by||Wolfram Research|
|Launched||May 18, 2009 (official launch) (3 years, 11 months, 4 weeks and 1 day)
May 15, 2009 (public launch)
|Alexa rank||3,313 (April 2013[update])|
Wolfram Alpha (also styled WolframAlpha and Wolfram|Alpha), is a computational knowledge engine or answer engine developed by Wolfram Research. It is an online service that answers factual queries directly by computing the answer from externally sourced "curated data", rather than providing a list of documents or web pages that might contain the answer as a search engine might.
Wolfram Alpha, which was released on May 15, 2009, is based on Wolfram's earlier flagship product Mathematica, a computational platform or toolkit that encompasses computer algebra, symbolic and numerical computation, visualization, and statistics capabilities. Additional data is gathered from both academic and commercial websites such as the CIA's World Factbook, the United States Geological Survey, a Cornell University Library publication called All About Birds, Chambers Biographical Dictionary, Dow Jones, the Catalogue of Life, CrunchBase, Best Buy, the FAA and optionally a user's Facebook account.
Users submit queries and computation requests via a text field. Wolfram Alpha then computes answers and relevant visualizations from a knowledge base of curated, structured data that come from other sites. Alpha thus differs from semantic search engines, which index a large number of answers and then try to match the question to one.
Using the Mathematica toolkit, Wolfram Alpha can respond to natural language questions and generate a human-readable answer. Wolfram has said of the engine:
"All one needs to be able to do is to take questions people ask in natural language, and represent them in a precise form that fits into the computations one can do,"
Wolfram Alpha can only provide robust query results based on computational facts, not queries on the social sciences, cultural studies or even many questions about history where responses require more subtlety and complexity. It is capable of responding to particularly phrased natural-language fact-based questions such as "Where was Mary Robinson born?" or more complex questions such as "How old was Queen Elizabeth II in 1974?" It displays its "Input interpretation" of such a question, using standardized phrases such as "age | of Queen Elizabeth II (royalty) | in 1974", the answer of which is "Age at start of 1974: 47 years", and a biography link. Wolfram Alpha does not answer queries which require a narrative response such as "What is the difference between the Julian and the Gregorian calendars?" but will answer factual or computational questions such as "June 1 in Julian calendar".
Mathematical symbolism can be parsed by the engine, which typically responds with more than the numerical results. For example, "lim(x->0) sin x/x" yields the expected result, 1, as well as a possible derivation using L'Hôpital's rule, a plot, and the series expansion. It is also able to perform calculations on data using more than one source. For example, "What is the fifty-second smallest country by GDP per capita?" yields Nicaragua, $1160 per year.
Wolfram Alpha is written in 15 million lines of Mathematica code and runs on more than 10,000 CPUs. The database currently includes hundreds of datasets, such as "All Current and Historical Weather". The datasets have been accumulated over several years. The curated (as distinct from auto-generated) datasets are checked for quality either by a scientist or other expert in a relevant field, or someone acting in a clerical capacity who simply verifies that the data is "acceptable".
One example of a live dataset that Wolfram Alpha can use is the profile of a Facebook user. If the user authorizes Facebook to share his or her account details with the Wolfram site, Alpha can generate a "personal analytics" report containing the age distribution of friends, the frequency of words used in status updates and other detailed information. Within two weeks of launching the Facebook analytics service, 400,000 users had used it. Downloadable query results are behind a pay wall but summaries are accessible to free accounts.
Licensing partners 
Wolfram Alpha is used to power some searches in the Microsoft Bing and DuckDuckGo search engines. For factual question answering, it is also queried by Apple's Siri, as well as Dexetra's speech recognition software for the Android platform, Iris.
Launch preparations began on May 15, 2009 at 7 pm CDT and were broadcast live on Justin.tv. The plan was to publicly launch the service a few hours later, with expected issues due to extreme load. The service was officially launched on May 18, 2009.
On December 3, 2009, an iPhone app was introduced. Some users considered the initial $50 price of the iOS app unnecessarily high, since the same features could be freely accessed by using a web browser instead. They also complained about the simultaneous removal of the mobile formatting option for the site. Wolfram responded by lowering the price to $2, offering a refund to existing customers and re-instating the mobile site.
On October 6, 2010 an Android version of the app was released and it is now available for Kindle Fire and Nook. A further 71 apps are available which use the Wolfram Alpha engine for specialized tasks.
Wolfram Alpha Pro 
On February 8, 2012, Wolfram Alpha Pro was released, offering users additional features for a monthly subscription fee. A key feature is the ability to upload many common file types and data—including raw tabular data, images, audio, XML, and dozens of specialized scientific, medical, and mathematical formats—for automatic analysis. Other features include an extended keyboard, interactivity with CDF, data downloads, the ability to customize and save graphical and tabular results and extra computation time.
Along with new premium features, Wolfram Alpha Pro has led to some changes in the free version of the site:
- An increase in advertisements on the free site.
- Text and PDF export options now require the user to setup a free account even though they existed before the introduction of Wolfram Alpha accounts.
- The option to request extra time for a long calculation used to be free but is now only available to subscribers.
Copyright claims 
InfoWorld published an article warning readers of the potential implications of giving an automated website proprietary rights to the data it generates. Free software advocate Richard Stallman also opposes the idea of recognizing the site as a copyright holder and suspects that Wolfram would not be able to make this case under existing copyright law.
- The Wolfram|Alpha Launch Team (May 8, 2009). "So Much for A Quiet Launch". Wolfram|Alpha Blog. Wolfram Alpha. Retrieved 2013-02-09.
- The Wolfram|Alpha Launch Team (May 12, 2009). "Going Live—and Webcasting It". Wolfram|Alpha Blog. Wolfram Alpha. Retrieved 2013-02-09.
- "Wolframalpha.com Site Info". Alexa Internet. Retrieved 2013-04-22.
- Bobbie Johnson (May 21, 2009). "Where does Wolfram Alpha get its information?". The Guardian. Retrieved March 8, 2013.
- Johnson, Bobbie (March 9, 2009). "British search engine 'could rival Google'". The Guardian (UK: Guardian News and Media). Retrieved 2013-02-09.
- Dillet, Romain (September 7, 2012). "Wolfram Alpha Makes CrunchBase Data Computable Just In Time For Disrupt SF". TechCrunch. Retrieved 2013-02-09.
- Golson, Jordan (December 16, 2011). "Wolfram Delivers Siri-Enabled Shopping Results From Best Buy". MacRumors. Retrieved 2013-02-09.
- Barylick, Chris (November 19, 2011). "Wolfram Alpha search engine now tracks flight paths, trajectory information". Engadget. Retrieved 2013-02-09.
- Farber, Dan (March 8, 2009). "Wolfram Alpha: Next major search breakthrough?". CNET. Retrieved 2013-02-09.
- WolframResearch (October 10, 2011). "Stephen Wolfram: The Background and Vision of Mathematica". Youtube.com. Retrieved 2013-02-09.
- Lardinois, Frederic (April 25, 2009). "Wolfram|Alpha: Our First Impressions". ReadWriteWeb. Retrieved 2013-02-09.
- Wolfram, Stephen (May 15, 2009). "Wolfram|Alpha Is Launching: Made Possible by Mathematica". WolframAlpha Blog (Wolfram Alpha). Retrieved 2013-02-09.
- Ozimek, Jane Fae (May 18, 2009). "Taking a first bite out of Wolfram Alpha". The Register. Retrieved 2013-02-09.
- Jack Krupansky (2009). "The Semantic Abyss - Plumbing the Semantic Web: Exploring the depths of the semantic gap between the Semantic Web and real world users and consumers".
- Weber, Thomas E. (September 5, 2012). "Wolfram Alpha's Facebook Analytics Tool Digs Deep into Your Social Life". Tech (Time Magazine). Retrieved 2013-02-09.
- R., A. (September 21, 2012). "Visualising Facebook Who am I?". Graphic detail (The Economist). Retrieved 2013-02-09.
- Joanna Nelson (March 4, 2013). "A Wolf or a Ram? What is Wolfram Alpha?". Public Libraries Online.
- Krazit, Tom (August 21, 2009). "Bing strikes licensing deal with Wolfram Alpha". CNET. Retrieved 2013-02-09.
- The Wolfram|Alpha Team (April 18, 2011). "Wolfram|Alpha and DuckDuckGo Partner on API Binding and Search Integration". Wolfram|Alpha Blog. Wolfram Alpha. Retrieved 2013-02-09.
- "Wolfram 'search engine' goes live". BBC News. May 18, 2009. Retrieved 2013-02-09.
- Spivack, Nova (March 7, 2009). "Wolfram Alpha is Coming – and It Could be as Important as Google". Nova Spivack – Minding the Planet. Retrieved 2013-02-09.
- Singel, Ryan (May 18, 2009). "Wolfram|Alpha Fails the Cool Test". Wired. Retrieved 2013-02-09.
- Siegler, MG (December 3, 2009). "Nice Try, Wolfram Alpha. Still Not Paying $50 For Your App.". TechCrunch. Retrieved 2013-02-09.
- Luoma, TJ (December 3, 2009). "WolframAlpha iPhone-formatted web page no longer available". TUAW. Retrieved 2013-02-09.
- Broida, Rick (April 1, 2010). "Get Wolfram Alpha app for $1.99-and a refund if you paid more". CNET. Retrieved 2012-02-28.
- Rao, Leena (October 6, 2010). "Wolfram Alpha's Android app now available". TechCrunch. Retrieved 2013-02-09.
- "Wolfram|Alpha: Mobile & Tablet Apps". Wolfram Alpha. 2013. Retrieved 2013-02-09.
- Wolfram, Stephen (February 8, 2012). "Announcing Wolfram|Alpha Pro". Wolfram|Alpha Blog (Wolfram Alpha). Retrieved 2013-02-09.
- Hachman, Mark (February 7, 2012). "Data Geeks, Meet Wolfram Alpha Pro". PC Magazine. Retrieved 2012-02-15.
- Orca, Surfdaddy (2009-06-24). "A User's Guide to Wolfram Alpha". H+ Magazine. Retrieved 2013-04-24.
- Marlowe, James (2011). "Wolfram Alpha Usability Test Survey". Retrieved 2013-04-24.
- McAllister, Neil (29 July 2009). "How Wolfram Alpha could change software". InfoWorld. Retrieved 2012-02-28.
- Stallman, Richard (4 August 2009). "How Wolfram Alpha's Copyright Claims Could Change Software". Access 2 Knowledge mailing list. http://lists.essential.org/pipermail/a2k/2009-August/004865.html. Retrieved 2012-02-17.
Further reading 
- Wolfram Alpha: A New Way To Search?, Stephen Wildstrom, BusinessWeek, 9 March 2009.
- Stephen Wolfram's Answer To Google: If Wolfram/Alpha works as advertised, it will be able to do something Google can't: provide answers that don't already exist in indexed documents. by Thomas Claburn, InformationWeek, 10 March 2009.
- Better Search Doesn’t Mean Beating Google by Saul Hansell, The New York Times, 9 March 2009.
- Wolfram Alpha will Take Your Questions – Any Questions, Ian Paul, PC World, 9 Mar 2009.
- Wolfram Alpha: Searching for Truth: Stephen Wolfram talks with Rudy Rucker about his Upcoming Release by Rudy Rucker, H+ Magazine.
- "A hungry little number cruncher: Wolfram Alpha search tool mines databases to yield math-based replies" by Hiawatha Bray, The Boston Globe, 5 May 2009