FRAMEWORKS & TOOLS • MAY 2026

C# and .NET Core in the Browser.

Microsoft's .NET ecosystem is an absolute powerhouse for enterprise development, but it has historically been tethered to incredibly heavy desktop IDEs like Visual Studio. For quick prototyping or educational purposes, downloading a multi-gigabyte installer just to write a simple C# class is overkill.

The Blazor WebAssembly Runtime

NitroIDE brings the full weight of the .NET Core runtime directly to the web. By leveraging the same WebAssembly technologies that power Blazor, we instantiate a complete, local C# execution environment within the V8 engine. You can compile complex object-oriented architectures with zero remote server latency.

// Compiling modern C# 12 natively in a web tab
using System;
using System.Linq;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        var developers = new List<string> { "Alice", "Bob", "Charlie" };

        // LINQ queries execute instantly on the local CPU
        var filtered = developers.Where(d => d.StartsWith("A"));

        foreach (var dev in filtered)
        {
            Console.WriteLine($"Welcome to NitroIDE, {dev}!");
        }
    }
}

OmniSharp Integration: C# developers demand world-class tooling. NitroIDE compiles the OmniSharp Language Server into a background Web Worker, providing you with the exact same deep semantic analysis, parameter hints, and refactoring tools you would expect from Visual Studio.

Nuget Package Support

You aren't limited to the standard library. NitroIDE's decentralized package manager can fetch external `.nupkg` files directly from Nuget.org and cache them in your browser's Origin Private File System (OPFS), allowing you to build real-world .NET applications anywhere.

Compile C# Natively.

Write high-performance C# code completely offline.

Launch C# IDE