Search Autocomplete Extension by Amasty for Magento 2

This Search Autocomplete for Magento 2 will help your customers to instantly find necessary products with an informative quick search window. You can customize autocomplete popup display according to users' needs and make product search process as easy as it can be.

- Use advanced autocomplete window
- Display recent and popular searches
- Enable search in categories, products and on CMS pages
- Customize search window layout
- Display 'Add to cart' button in the autocomplete popup

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Hello!
Here is another ajax search extension available for Magento 2: https://cmsideas.net/magento-2-ajax-search-pro.html
Magento 2 Ajax Search Extension can automatically figure out what your customers type and then suggest the results. Also, admin can configure product details to show necessary information in the pop-up. The more easily search tool provide, the better experience user have and sales also increase quicker.

View more magento 2 extensions by Cmsideas here: https://cmsideas.net/magento/magento-2-extensions.html