Sheetlight

A lightweight, fast local spreadsheet app for Windows.

Open a workbook, browse it instantly, edit cells and formulas, and save it. No accounts, no cloud, no ribbon. Sister app of Doclight.

The app interface is in Spanish.

Download

Grab the installer from the latest release. It installs for the current user only, so it doesn't need admin rights.

Features

• Opens and saves .xlsx and .csv, including CSVs that use ; separators and decimal commas
• Formula engine powered by IronCalc, with instant recalculation
• Fast canvas grid that scrolls smoothly through large sheets
• Ribbon with cell formatting, borders, colours, number formats, filters, sorting, find and replace
• Multiple sheets per workbook, and multiple workbooks open in tabs
• Charts: create them from Insertar → Gráfico, and charts in Excel files are kept
• Can be set as the default app for Excel files

Known issues are listed in the release notes, and what's next lives in docs/PLAN.md.

Requirements (for building)

• Node.js 18 or later
• Rust (stable, MSVC toolchain on Windows)
• Visual Studio Build Tools with C++

Development

npm install
npm run tauri dev

Run the tests:

npm test

Building the installer

npm run tauri build

The NSIS installer is written to src-tauri/target/release/bundle/nsis/. The executable is named Sheetlight.

Architecture

• src/grid — canvas renderer, viewport, hit-testing, selection
• src/editor — in-cell editor, formula bar, autocomplete
• src/engine — WorkbookEngine contract and formula engine adapter
• src/model — commands, undo/redo, selection state, clipboard
• src/files — opening and saving .xlsx, .csv and .xls
• src/charts — chart model and renderer
• src/components — toolbar, tabs, status bar, dialogs
• src/lib — number formats, locale, theme, utilities
• src-tauri — native window, file associations and local file I/O
• tests — unit tests, real-world workbook corpus, benchmarks

License

MIT © sergiiopm