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Most famous search extension is Ultimate Sphinx Search.
It is a Magento extension developed by Mirasvit developers and aimed at simplifying e-commerce product search.
Ultimate Sphinx Search is such a versatile Magento extension that incorporates most of the advanced features like advanced Sphinx search, autocomplete, suggestions and spell-correction.
What is the purpose of the advanced features of the Ultimate Sphinx Search?
Spell-correction feature. On average, 20% of online product search queries are mistyped forcing online buyers to leave because of poor product search. Now what? With the spell-correction, all typing and misspelled queries are automatically corrected, thereby improving customer user experience (website navigation), conversion rates as well as increasing revenue generation.
How does the it work? Assuming you want a Sony smartphone from an online store, and in the search box instead of typing Sony you type 'siny', a normal Magento search will bring zero results, but this extension will give you a number of suggestions of the sony smartphones from which you’ll be able to make a choice from the online store database.
So far, the plugin supports all languages, and it does not require any additional software while installing it.
Autocomplete & Suggestion feature. While typing in the search box, this feature adds the autocomplete functionality with tips of a particular product you’re trying to find. Once you type in the first letter of the product, you’re searching for, this extension brings a catalog of products from the online database starting with the same letter. That way, you'll be able to get the product you were looking for.
Advanced sphinx search. This feature is powered to bring out relevant search terms much faster helping the online store increase the conversion rates and ultimately making more sales. The advantage is that it searches products category by multiple content types like the catalog products, catalog categories or catalog attributes.