From my experience with OpenSilver, it stands out as a practical solution for developers looking to modernize legacy Silverlight applications without a complete rewrite. The seamless integration with Visual Studio and the ability to compile C# and XAML into WebAssembly makes it accessible for .NET developers familiar with these technologies. However, its focus on Silverlight compatibility means it’s less suited for new projects that don’t rely on that ecosystem. Overall, if you maintain Silverlight apps and want to bring them into the modern web era, OpenSilver offers a robust, plugin-free path forward.
OpenSilver - Open Source Silverlight Alternative for Modern Web Apps
OpenSilver is an open source framework that allows developers to run Silverlight applications in modern web browsers using WebAssembly, eliminating the need for plugins and enabling legacy app modernization.
- Best for
- Modernizing Legacy Silverlight Applications
- Key capability
- Plugin-Free Silverlight Compatibility
Do you recommend this tool?
What is OpenSilver?
OpenSilver is an open source reimplementation of Microsoft Silverlight that allows developers to build rich internet applications using C# and XAML, targeting modern browsers via WebAssembly. It eliminates the need for browser plugins by compiling Silverlight applications to WebAssembly, enabling legacy Silverlight apps to run natively on current web platforms.
Key features of OpenSilver
OpenSilver offers a plugin-free Silverlight-compatible framework that compiles C# and XAML code to WebAssembly, supports modern web APIs, integrates with Visual Studio, and provides tools for migrating existing Silverlight projects to modern web standards.
Plugin-Free Silverlight Compatibility
Runs Silverlight applications in modern browsers without requiring any plugins.
WebAssembly-Based Runtime
Leverages WebAssembly to execute C# code efficiently in the browser.
Visual Studio Integration
Provides project templates, debugging, and tooling support within Visual Studio.
Migration Tools
Includes utilities to assist in porting existing Silverlight applications to OpenSilver.
Open Source License
Fully open source under the MIT license, encouraging community contributions.
Pros and cons of OpenSilver
Pros
- Enables modernization of legacy Silverlight apps
- Runs in all modern browsers without plugins
- Open source with active community support
- Seamless Visual Studio integration
- Leverages WebAssembly for performance
Cons
- Limited to Silverlight-compatible applications
- Smaller ecosystem compared to mainstream frameworks
- Requires knowledge of C# and XAML
Key use cases for OpenSilver
Modernizing Legacy Silverlight Applications
OpenSilver enables developers to migrate existing Silverlight applications to modern web standards without rewriting the entire codebase.
Developing Rich Web Applications
Create interactive and high-performance web applications using familiar C# and XAML technologies compiled to WebAssembly.
Cross-Platform Web App Development
Build web apps that run seamlessly across browsers without plugins, leveraging the power of WebAssembly and open web standards.
Open Source Community Collaboration
Contribute to and benefit from an open source ecosystem focused on Silverlight-compatible web development.
How OpenSilver works
- 1
Install OpenSilver Extension
Add the OpenSilver extension to Visual Studio to enable project templates and tooling.
- 2
Create or Migrate Project
Start a new OpenSilver project or migrate an existing Silverlight application using provided migration tools.
- 3
Develop Using C# and XAML
Write your application logic and UI with familiar Silverlight technologies.
- 4
Compile to WebAssembly
Build the project to compile C# code into WebAssembly, producing a plugin-free web application.
- 5
Deploy to Web Server
Host the compiled application on any standard web server for users to access via modern browsers.
Who is using OpenSilver
Developers maintaining Silverlight applications
Enterprise teams migrating legacy web apps
C# and XAML developers targeting web
Open source contributors interested in web frameworks
Software architects planning modernization strategies
OpenSilver pricing
Free
$0
OpenSilver is completely free and open source with no licensing fees.
Plans and prices are as published by the vendor and can change. Check the official site before you buy. Open the pricing page (opens in a new tab)
Frequently asked questions about OpenSilver
OpenSilver is an open source reimplementation of Microsoft Silverlight that runs Silverlight apps in modern browsers using WebAssembly.
No, OpenSilver applications run natively in browsers without any plugins.
Yes, OpenSilver provides migration tools to help port Silverlight applications to its platform.
Yes, OpenSilver is open source and free to use under the MIT license.
This tool is designed to help users accomplish its core tasks more efficiently. It is typically used by individuals or teams looking to improve productivity and workflow.
It depends on your specific needs and how you plan to use the tool. The official website and documentation are the best sources for the latest details.
Yes, it can help with that use case depending on how you configure it and what features are available. You’ll get the best results with clear inputs and a defined goal.
Some tools offer a free plan or trial with limited features. Availability can vary, so confirm on the official website.
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