Lexxe launched its Alpha version in 2005, featuring Natural Language question answering (i.e. users could ask questions in English to the search engine apart from keyword searches — this feature has been suspended for redevelopment since 2010).
In 2011, Lexxe launched Beta version  with a new search technology called Semantic Key. Semantic Keys enable users to query with a conceptual keyword (or a keyword with a special meaning, hence the term Semantic Key) in order to find instances under the concept, e.g. price → $5.95 or €200, color → red, yellow, white. For example, “price: a pound of apples”, “color: ferrari”. With initial 500 Semantic Keys at the Beta launch, Lexxe became the first search engine in the world to offer this unique and useful search technology to the users.
In human communication, Semantic Keys are common in questions and information exchange. Likewise, they could be a useful tool for search engines between users and internet information, particularly when dealing with unstructured data.
Lexxe Beta version also supports normal keyword search.
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