Top 10 C# IDEs for Windows, macOS, and Linux – 2021 Review

Why a Dedicated C# IDE Matters

C# (C Sharp) is Microsoft’s flagship language for building robust Windows applications, mobile apps, web services, and games. Its strong type system, modern syntax, and seamless integration with the .NET ecosystem make it a go‑to choice for both enterprise and hobbyist developers. A high‑quality Integrated Development Environment (IDE) not only speeds up coding with features like IntelliSense and refactoring but also provides powerful debugging, build automation, and version‑control integration.

Top 10 C# IDEs (2021)

1. Visual Studio Code

   Visual Studio Code (VS Code) is a lightweight, open‑source editor that has become a favorite among C# developers. With the C# extension, it offers IntelliSense, debugging, and Git integration out of the box. Its extensible marketplace allows you to tailor the editor to any workflow.

   • Cross‑platform: macOS, Windows, Linux
   • Smart IntelliSense and code completion
   • Built‑in Git, extensions for Azure, Docker, and more
   • Free and actively maintained by Microsoft

   Download: https://code.visualstudio.com/

2. Kite

   Kite is a AI‑powered coding assistant that supports C# along with 16 other languages. It suggests multi‑line completions, offers function signatures, and provides documentation on hover, which reduces context switching.

   • Platform: Windows (desktop)
   • Real‑time documentation and code hints
   • Integrated with popular editors such as VS Code and Atom

   Learn more: https://www.kite.com/

3. SlickEdit

   SlickEdit is a feature‑rich, cross‑platform editor that supports more than 60 languages, including C#. It offers advanced navigation, multi‑cursor editing, and a built‑in debugger for quick error resolution.

   • Supported platforms: Windows, Linux, macOS, Raspberry Pi
   • Version‑control integration (Git, SVN, Mercurial)
   • Syntax highlighting, code folding, and IntelliSense‑like completions
   • Flexible licensing: Standard and Pro editions

   Website: https://www.slickedit.com/

4. Eclipse aCute

   Eclipse aCute is a lightweight extension that brings full C# and .NET Core support to the Eclipse IDE. It’s ideal for developers who prefer the Eclipse ecosystem but need native C# tooling.

   • Platform: Windows (Eclipse IDE required)
   • Code templates, syntax validation, and project management
   • Open source and actively maintained by the Eclipse Foundation

   Download: https://projects.eclipse.org/projects/tools.acute

5. Notepad++

   Notepad++ is a free, lightweight editor that offers excellent C# syntax highlighting and macro support. It’s especially handy for quick edits and scripting on Windows.

   • Platform: Windows (Linux via WSL)
   • Customizable UI, multi‑view editing, and plugin system
   • Open source (GPL)

   Download: https://notepad-plus-plus.org/downloads/

6. JetBrains Rider

   Rider combines the power of IntelliJ IDEA and ReSharper into a single cross‑platform IDE for C# and .NET development. It supports .NET Framework, .NET Core, Xamarin, and Unity projects.

   • Supported platforms: Windows, macOS, Linux
   • 2200+ live code inspections, context actions, and refactorings
   • Integrated database tools, unit test runners (NUnit, xUnit, MSTest)
   • Built‑in support for TypeScript, JavaScript, HTML, CSS, and Sass

   Learn more: https://www.jetbrains.com/rider/

7. Atom

   Atom is a hackable text editor that offers a clean C# experience with package support for IntelliSense, Git, and more. Its package manager makes it easy to add language features as needed.

   • Supported platforms: macOS, Windows, Linux
   • Smart auto‑completion, multi‑cursor editing, and quick project search
   • Open source, community‑driven ecosystem

   Download: https://atom.io

8. DevExpress

   DevExpress is not a traditional IDE but a suite of UI controls, reporting tools, and dashboards that integrate seamlessly with Visual Studio or Rider. It accelerates the creation of polished desktop and web applications.

   • Desktop UI components, Office file & PDF APIs
   • Reporting, analytics, and cross‑platform .NET app development
   • Commercial licensing with extensive documentation

   Explore: https://www.devexpress.com/

9. Codeanywhere

   Codeanywhere is a cloud‑based development environment that spins up a fully‑featured C# workspace in seconds. It’s ideal for teams that need instant collaboration and consistent environments.

   • Private URL preview with SSL, custom domain support
   • Dedicated memory & disk space, breakpoint debugging, call stack view
   • File comparison, remote folder sync, and extensible via marketplace
   • Platform: Windows (web interface)

   Try it: https://codeanywhere.com/

10. ScriptCS

    ScriptCS lets you write and run C# scripts without a full project setup. It’s perfect for scripting, rapid prototyping, and learning the language.

    • Syntax highlighting, dependency management, and quick execution
    • Integrates with Visual Studio Code via an extension
    • Open source and community maintained

    Download: https://scriptcs.net/

Frequently Asked Questions

What is C#?

C# is a general‑purpose, strongly‑typed language developed by Microsoft for the .NET platform. It supports object‑oriented, functional, and declarative programming styles.

Which are the best C# IDEs?

For most developers, the top choices are VS Code, Rider, and SlickEdit. For those on Linux or who need cloud collaboration, Atom and Codeanywhere are excellent alternatives.

Why use a C# IDE?

• Smart code completion and refactoring
• Integrated debugging and breakpoint management
• Built‑in version control and build automation
• Real‑time syntax validation and error highlighting

What can I build with C#?

C# is used to create desktop applications, web services, mobile apps (Xamarin), games (Unity), and high‑performance server solutions.