SketchUp is no longer just a desktop app. Trimble currently offers three main tiers:
: Focused on streamlining the SketchUp Go (iPad/Web) and SketchUp Pro (Desktop) offerings to ensure better file compatibility across devices. sketchup version list
Because of the acquisition history, users often get confused by the "Year" vs. "Number" branding. Here is a cheat sheet: SketchUp is no longer just a desktop app
Trimble Navigation acquired SketchUp from Google in April 2012. This era saw the modernization of the codebase and a shift toward cloud integration and subscription licensing. sketchup version list