Is Mono still being developed or should I switch?

Mono is in maintenance mode; the last major release was 2019, and Microsoft recommends migrating to .NET for active development. The project is being transferred to WineHQ, so it's best for legacy support only.

Mono vs .NET Core: which is better for cross-platform?

For new projects, use .NET Core or .NET 5+ as they are modern, actively developed, and have better performance. Mono is only suitable if you need to run old .NET Framework apps on non-Windows systems.

How to compile Mono from source on Linux?

You need an existing Mono installation for bootstrapping. Follow the Linux guide, run ./autogen.sh, and use 'make get-monolite-latest' if no Mono is available, then 'make' and 'make install'.

Can Mono run .NET 6 or .NET Standard libraries?

Mono has limited compatibility with newer .NET versions; it primarily targets .NET Framework. For .NET Standard, check specific library support, but .NET Core is a more reliable choice.

What's the performance difference between Mono and .NET?

Mono's performance is generally slower than modern .NET due to older optimizations and less active tuning. .NET Core introduced significant improvements in speed and efficiency.

How to embed Mono in a C++ application?

Use the embeddable runtime option; configure with --enable-minimal to reduce size, and refer to the 'samples/' directory for example code on integrating Mono as a shared library.

Open-Awesome

Mono

NOASSERTIONC#

An open-source implementation of Microsoft's .NET Framework for building cross-platform applications.

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What is Mono?

Mono is an open-source implementation of Microsoft's .NET Framework that enables developers to build and run .NET applications on multiple platforms including Linux, macOS, Android, and iOS. It provides a compatible Common Language Runtime (CLR), C# compiler, and class libraries based on ECMA standards. The project solves the problem of .NET application portability beyond the Windows ecosystem.

Target Audience

Developers who need to run .NET applications on non-Windows platforms, particularly those targeting Linux servers, mobile devices (Android/iOS), or embedded systems. It's also valuable for open-source projects requiring a cross-platform .NET runtime.

Value Proposition

Mono was the first production-ready open-source .NET implementation, offering early cross-platform capabilities when Microsoft's .NET was Windows-only. It provides source compatibility with .NET Framework applications and enables deployment to diverse environments without rewriting code.

Overview

Mono open source ECMA CLI, C# and .NET implementation.

Use Cases

Best For

Running existing .NET Framework applications on Linux servers
Developing cross-platform desktop applications with .NET
Building mobile apps for Android and iOS using C#
Embedding a .NET runtime in native applications
Porting Windows .NET applications to macOS
Educational purposes for studying CLR implementation

Not Ideal For

New projects starting from scratch with .NET 5+ or .NET Core
Teams requiring the latest .NET features, security updates, and long-term support
Applications targeting modern cloud-native or microservices architectures
Developers needing active community contributions and extensive third-party library ecosystems

Pros & Cons

Pros

Pioneering Cross-Platform Reach

Mono was the first to enable .NET applications on Linux, macOS, Android, iOS, and even niche OSes like AIX and FreeBSD, as shown in the build status table with community-supported architectures.

AOT Compilation Support

Provides ahead-of-time compilation for platforms where JIT is restricted, such as iOS, allowing .NET code to run in environments with execution limitations.

Embeddable Runtime Library

Can be embedded as a shared library into native applications, with configuration options for minimal builds, making it suitable for integration scenarios.

Legacy .NET Compatibility

Implements System.* and other .NET Framework libraries, facilitating the porting of existing Windows .NET apps to non-Windows systems without full rewrites.

Cons

Development Effectively Frozen

The README states the last major release was in 2019, with Microsoft recommending migration to .NET, indicating no new features and limited future support.

Complex Bootstrapping Build

Building from source requires an existing Mono installation for bootstrapping, and the guide notes fallbacks like 'make get-monolite-latest' add complexity and risk.

Outdated .NET Ecosystem Alignment

Lacks support for modern .NET innovations (e.g., .NET Core/5+ features), as development has shifted to Microsoft's fork in dotnet/runtime, leaving Mono behind.

Open Source Alternative To

Mono is an open-source alternative to the following products:

.NET Framework

.NET Framework is a software development framework created by Microsoft for building and running applications on Windows. It provides a comprehensive programming model and runtime environment for developing desktop, web, and mobile applications.

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