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dnlab

Tools

C# and Razor compiler playground. Unofficial tool for .NET developers.

Downloads
1+
on Google Play
Price
$19.99
No in-app purchases
Updated
Oct 29
2026 · v1.25.0
Get it onGoogle Play See alternatives

Screenshots

  • dnlab screenshot 1
  • dnlab screenshot 2
  • dnlab screenshot 3
  • dnlab screenshot 4

About dnlab

Disclaimer: this is not an official Microsoft product.

Also known as ".NET Lab."

For more details, see https://github.com/jjonescz/DotNetLab.

Features:
- Razor/CSHTML to generated C# code / IR / Syntax Tree / Errors.
- C# to IL / Syntax / IOperation / Symbols / decompiled-C# / JIT Asm / Errors / Execution console output.
- Any Roslyn/Razor compiler version (NuGet official builds or CI builds given PR number / branch / build number).
- VSCode Monaco Editor.
- Multiple input sources (especially useful for interlinked Razor components).
- C# Language Services (completions, live diagnostics, code fixes).
- Configuring any C# options (e.g., LangVersion, Features, OptimizationLevel, AllowUnsafe) via Roslyn C# APIs or via #:property directives (both with editor completions).
- Referencing NuGet packages via #:package directives.

What’s new

Version 1.25.0 · Updated October 29, 2026

v1.25.0: allow loading compiler from disk ### Features - Allow choosing a local roslyn repo from disk to load it as compiler - Allow referencing source generators and analyzers from `#:package`s - Run built-in .NET source generators and analyzers ### Enhancements - Simplify the default display format of Error List - Use CoreCLR instead of Mono in the Android app ### Fixes - Improve JIT assembly For more details and previous releases, see https://github.com/jjonescz/DotNetLab/releases

User reviews

no name
no name
Developer fixed all of the gripes I had with the app and now it's the best way to quickly check a hypothesis or a bit of code on the go. If you use the web app and want to support the dev, I highly recommend buying it!

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