Swiftype offers a fast, modern search that is easy to set up and use. Main feature include autocomplete, query result management, and analytics. There are free and paid (starting at $19/mo) versions available.
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Pro Easy & fast deployment
Pro Real-Time Analytics
Built-in search analytics give you live insight into what your users are looking for.
Pro Custom result ranking
Drag-and-drop default results to re-order them. Changes are instantly reflected on website.
Pro Android & iOS support
Swiftype offers full integration with both Android and iOS SDK's
Pro Third Party Compatibility
Swiftype integrates with all major third party platforms, offering a Shopify App, Magento Extension, and WordPress Plugin, with more to come. Swiftype also provides tutorials for adding Swiftype to Tumblr, Jimdo, Heroku, Weebly, Tumblr, CloudFlare, WebStarts and Desk.com. They also have questions dealing with fixes for WooCommerce, how to add Swiftype to any CMS (such as Drupal or Jekyll) and searching across content types (like WordPress using GoDaddy Shopping Cart)
Pro WordPress plugin
Swiftype offers a WordPress plugin for easy integration.
Pro Multiple client libraries
Swiftype has client libraries for Python, Ruby, node.JS, Java, PHP, a search and a separate autocomplete library for jQuery, an iOS SDK, and an Android SDK.
Price starts at $300/month.