# What is Project OutFox?

StepMania 5.3, also known as "Project OutFox", is a refactoring of StepMania's internal codebase to improve performance, adhere to modern coding practices, and enhance its capabilities on modern hardware and other platforms (including single-board embedded systems such as Raspberry Pi). Improvements to uncapped frame rate have also been recorded on older hardware, as far back as the Pentium E2180. It also incorporates a new default theme with more integrated features than previous versions, and new internal functions that can be used for future content.

As it's a continuation of the 5.0.12 and 5.1 codebase (not “5.2”), it remains compatible with almost all existing songs, themes, and noteskins that are supported on these versions (if you do encounter odd behaviour or other issues with older content, please report it to us as a bug).

5.3 is unrelated to 5.1 -3 (sometimes written as 5.1-3), which was a prior build of 5.2 before it was renamed