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run managed .NET code across cloud, mobile, desktop, and IoT with CoreCLR, Mono, base libraries, and the shared host

OSS scale score 310.0OSS health 96Update pace 598 commits/30d
About these scores

OSS scale score is an unbounded metric that log-compresses and weights Stars, Watchers, Forks, and Contributors. Discovery score is the current OSS scale score minus the score at discovery. Update pace is commits in the last 30 days, growth momentum is the OSS scale score difference within the recent observation window, and OSS health is a 0–100 rating based on available recency, Community Health, and release data.

Stars
18,307
Primary language
C#
License
MIT
Repository last updated
Oct 4, 2026
On this page

Overview

The .NET Runtime repository contains CoreCLR and Mono execution engines, base libraries, the shared host, and installer sources used to run managed .NET code across supported platforms. Runtime engineering includes JIT and NativeAOT execution, GC, libraries, hosting, and platform portability.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Key features

Include both CoreCLR and Mono runtime implementations

The workflow guide separates the runtime component into CoreCLR and Mono. CoreCLR is the comprehensive execution engine while Mono provides a lighter runtime with different platform and development tradeoffs.

Sources: [1][2]

Ship base libraries and the dotnet host with the runtime

The repository contains runtime engines together with libraries, the shared host, and installer sources needed by the .NET execution environment.

Sources: [1][2]

Support JIT, NativeAOT, and cross-compilation workflows

CoreCLR development includes JIT-oriented components, NativeAOT has dedicated build guidance, and the workflow documentation distinguishes build and target platforms for cross-compilation.

Sources: [2]

Best fit

Fits low-level development of .NET runtime internals, libraries, and hosting

This repository is for work on GC, JIT/runtime execution, base libraries, hosts, and portability rather than ordinary application-framework development.

Sources: [1][2]

Before adoption

Use official runtimes and SDKs for normal application development

The README directs application users to official .NET releases; building the complete runtime repository is not required to run normal .NET applications.

Sources: [1]

Source builds require substantial disk space and component-specific tooling

The workflow guide notes that a single OS/platform build can consume roughly 10–20 GB and documents separate requirements and subsets for CoreCLR, Mono, libraries, and other components.

Sources: [2]

10.0.12 is a stable patch with GC, JIT, Mono, and related runtime fixes

Version 10.0.12 includes fixes across GC suspension, JIT lowering, Mono execution, and other runtime areas, so patch updates should be treated as ongoing runtime correctness and security maintenance.

Sources: [3]

Official sources

  1. [1].NET Runtime 10.0.12 README(2026-10-04)
  2. [2].NET Runtime 10.0.12 workflow guide(2026-10-04)
  3. [3].NET Runtime 10.0.12 release(2026-10-04)
  4. [4].NET Runtime MIT license(2026-10-04)
Supplemental curator note

Application developers normally install official .NET runtimes or SDKs instead of building this repository. Runtime-source development has separate CoreCLR, Mono, libraries, and host subsets with substantial toolchain and disk requirements, so treat it as a different workflow from ordinary application development.

Try it in 3 steps

  1. 1

    Confirm that .NET Runtime 10.0.12 is installed

    Verify that stable runtime 10.0.12 is available for framework-dependent applications.

    dotnet --list-runtimes | grep 'Microsoft.NETCore.App 10.0.12'
  2. 2

    Create a .NET 10 console application

    Generate a minimal framework-dependent application for runtime validation. Project creation requires a .NET 10 SDK.

    dotnet new console -n RuntimeDemo -f net10.0
  3. 3

    Run the managed application on the installed runtime

    Confirm that the application executes on the installed .NET 10 runtime without building the runtime source repository.

    dotnet run --project RuntimeDemo/RuntimeDemo.csproj
Check the official README

Growth

Growth trends · Last 30 days

18,307 Stars

Trend data is still being collected.

Development activity

Last 90 days · weekly

Commits (last 30 days)
598
Open PRs
683

Development activity is still being collected.

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GitHub data

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GitHub Topics

  • dotnet
  • hacktoberfest
  • help-wanted
Stars
18,307
Forks
5,638
Watchers
447
Open issues
7,398
Contributors
317
Owner type
Organization
Primary language
C#
License
MIT
Repository last updated
Oct 4, 2026
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