Compare Richard Burns Rally setup files side by side.

• Drag-and-drop import — load .lsp setup files by dropping them onto the app or using a file picker
• RBR directory browsing — point the app at your RBR installation to browse and select setups from rsfdata/, Physics/, and SavedGames/ directories, with cross-location deduplication (uses File System Access API, remembered across sessions)
• Side-by-side comparison — view multiple setups in a single table, organized by section (Suspension, Engine, Tyres, etc.)
• Difference highlighting — individual cells that differ from the reference setup are highlighted, with numeric deltas shown as color-coded +/- values
• Front/rear split ratios — paired Front/Rear parameters are grouped together with the split ratio (e.g. 72:28) overlaid between them
• Diffs-only mode — toggle to hide matching parameters and focus on what's different
• Units and formatting — values are displayed with appropriate units (mm, kN/m, kPa, etc.) and consistent decimal precision
• Sticky headers and columns — parameter names and setup columns stay visible while scrolling
• Collapsible sections — expand or collapse setup sections individually
• Drag-to-reorder — rearrange setup columns by dragging
• Setup management — add, remove individual setups, or clear all at once
• Shareable links — copy a URL that encodes the current comparison, so others can open it without needing the original files

• pmfrlyn/RBRTools — Python parser used as reference for the .lsp file format and parsing logic
• pshires/RbrSetupCompare — Ruby app used as reference for unit conversions and value sanitization
• RBR Setup Studio — UI/UX reference for setup value display
• RallySimFans — community platform whose directory structure conventions (rsfdata/, car naming, RSF IDs) the app supports
• NGP6 physics plugin — defines the modern .lsp format variant and _NGP parameters