Sinatra has been getting a lot of attention lately as the next great (micro-)framework. In writing apps, diving in, and contributing the reasons for its existence have become more clear. Sinatra is not just a toy or a neat trick, its the best way to create simple and non-obtrusive web interfaces to sit on top of a new or existing Ruby codebase. I’ll walk through the whats, whys, and tools for getting started with Sinatra.