Material Design Components is an open-source UI toolkit that provides developers with a comprehensive set of interactive building blocks for creating user interfaces. Developed by TekHeist, this free Android app is designed to streamline collaboration between designers and developers, making it easier to build beautiful products.

The Material Design Components app includes a vast array of components, including adaptive components, app bars, backdrop, banners, bottom navigation, buttons, cards, chips, data tables, date pickers, dialogs, dividers, image lists, lists, menus, navigation drawers, navigation rails, progress indicators, selection controls, sheets, sliders, snack bars, tabs, text fields, time pickers, and tooltips. With Material Design Components, developers can easily create rich, interactive interfaces that are both beautiful and functional.

While the app is primarily intended for developer demo purposes, it's also an excellent resource for designers who want to explore the capabilities of Material Design Components. The app is available for free on Android, and developers can also access the source code for testing purposes on the BoltUix website.