Knack helps non-programmers easily build beautiful, data-driven web apps. Data can be imported from spreadsheets and converted to an online database. Tools like search, forms, and tables are used to build web apps that work with the data. Apps can be published to any site and adapt to the surrounding design. Multiple versions can be published to different sites and for different audiences. Developers can extend these apps with a RESTful API, custom CSS, and JS event handlers.