MySheets

A lightweight, cross-platform spreadsheet application built with .NET 9.0. Designed for performance using sparse memory structures and a custom-built formula compiler.

Features

• Modern UI: Clean and intuitive interface with a dedicated formula bar for easy editing (supports visual area selection, click-to-link cell references etc..).
• Smart Formulas: Supports complex math expressions and cell references (e.g., =A1+B2, =SUM(A1:H7)).
• File Support: Save and load your spreadsheets in JSON and Excel (.xlsx) formats.
• Instant Updates: Changing a value automatically recalculates all related cells in real-time.
• High Performance: Optimized to run fast and use minimal memory.
• Cross-Platform: Works natively on Windows, macOS, and Linux.

Tech Stack

• Core: C# 12, .NET 9.0
• Architecture: Clean Architecture (Core logic decoupled from UI)
• UI Framework: Avalonia UI (MVVM)
• Testing: xUnit

Getting Started

git clone https://github.com/zahorodnyi/my-sheets.git
cd my-sheets/MySheets.UI
dotnet run