|Headquarters||London, United Kingdom|
|Founder(s)||Or Offer, Nir Cohen|
|Industry||Advertising, Information technology|
|Type of site||Web traffic and ranking|
Type of site
|Written in||Apache Hadoop|
|1,483 (February 2015[update])|
SimilarWeb Ltd (formerly SimilarGroup) is an information technology company founded in March 2009 by Or Offer. From its headquarters in London, U.K., SimilarWeb provides services in web analytics, data mining and business intelligence for international corporations. Through its main platform called SimilarWeb, it uses big data technologies to collect, measure, analyze and provide user engagement statistics for websites and mobile apps.
Or Offer founded SimilarWeb with Nir Cohen on March 3, 2009 in Tel-Aviv, Israel. Later the company moved its headquarters to London, U.K. On May 31, 2010 the company raised $1.1 million in a series A round of investment led by Yossi Vardi, International Management, Liron Rose, and Omer Kaplan. On January 29, 2013 SimilarWeb raised another $2.5 million. On September 24, 2013 the company closed an additional $3.5 million extension to its Series B round led by David Alliance, Moshe Lichtman and participation of existing investor Docor International Management. On February 24, 2014 South Africa media giant Naspers invested $18 million into SimilarWeb by funding a Series C.  Within a month, SimilarWeb used a part of the capital for acquisition of Israeli early-stage company TapDog for a few million dollars in shares and cash, less than a year after TapDog was founded. On November 2014, SimilarWeb announced that it has collected funds for its global expansion and enhancement of its mobile insights and mobile app platform. To this initiative, Naspers and Lord David Alliance contributed $15 million dollars in a series D investment.  SimilarWeb's most notable clients include PayPal, eBay Inc., Flipkart, Adidas and others.
In June 2013, SimilarWeb released SimilarWeb PRO, an advanced version of the free and general purpose SimilarWeb. In addition, SimilarWeb provides its data in form of API. SimilarWeb uses data extracted from four main sources: 1) A panel of web surfers made of millions of anonymous users equipped with a portfolio of apps, browser plugins, desktop extensions and software; 2) Global and Local ISPs; 3) Web traffic directly measured from a learning set of selected websites and intended for specialized estimation algorithms; 4) A colony of web crawlers that scan the entire Web.
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