Sahi is a powerful and lightweight web testing tool that has been in development since 2005. It uses record and playback functionality to create scripts in a JavaScript-like language. Sahi can test AJAX applications and multiple browsers without waits. It is friendly for developers, testers, and managers by allowing parametrization, version control, reporting, and reducing costs. Sahi Software provides commercial support, training, and customization for the Sahi tool.