Brainy Filter for OpenCart is a well thought out and excellently made module that allows filtering products by keywords, brands, prices, availability, rating, options, and product attributes.
Brainy Filter looks beautifully and works on different devices. There is a high-grade HTML/CSS code that is easy to adapt to any custom design. The filter has been tested on Android, iOS, and Windows Phone devices. The filter works with responsive themes.Админка (demo: demo)