We built Algolia to make search easier for everyone, and a lot of our customers implement search within existing websites or mobile applications. However, we also have customers like AppApp, an independent search engine for the iOS App Store, who wanted to bring faceting functionality to their mobile interface, which was not possible with traditional desktop designs due to the limited screen space on mobile devices. After several iterations, they found a solution that allowed users to interact with facets in a way that was both intuitive and effective, by moving the facet component into a drawer-like fashion that could be opened and closed as needed, and labeling it with a clear call-to-action to make it more user-friendly.