Spark Grid, a native Mac spreadsheet for real Excel files

Field notes

Spark Grid targets macOS 14+ and is designed around exchanging real Excel workbooks rather than presenting a browser-only grid. Its stated file coverage includes formulas, merged cells, filters, conditional formatting, charts, and images, while the interface uses a custom AppKit canvas with keyboard navigation and a fill handle. The page also describes multi-sheet tabs, freeze panes, formula autocomplete, and error banners. The Mac App Store release is marked as coming soon, so the visible site documents the intended workflow more clearly than current availability.