OpenSilver – WPF/Silverlight for the Modern Web

OpenSilver is a free, open-source UI framework for building modern .NET web applications in C# and XAML. Professionally supported by Userware, it enables you to run WPF/Silverlight-style applications on modern browsers and devices with MAUI hybrid integration and AI-enhanced tooling.

Key Value Proposition

• Build once, run everywhere: targeting Windows, Android, iOS, macOS, and major browsers (Chrome, Firefox, Safari).
• MAUI Hybrid integration for broader device coverage.
• Maintain look-and-feel of your legacy Silverlight/WPF apps while upgrading to a modern web stack.
• 100% code reusability: reuse existing Silverlight/WPF codebases with minimal rewrites.
• Blazor, React, and Angular compatibility options to mix and match with modern stacks.

Release Highlights

• OpenSilver 3.2 introduces MAUI Hybrid integration and an AI-enhanced drag-and-drop UI designer.
• Strong compatibility with Microsoft Silverlight and extensive WPF support.
• Cross-platform deployment emphasizes identical UI screen parity and minimal retraining.

How It Works

• Code in C#, VB, or F# to build web applications using the familiar WPF/Silverlight paradigm.
• Port and run existing Silverlight or WPF apps on modern browsers with OpenSilver as the runtime.
• Integrate with enterprise controls and libraries, including RIA Services and LightSwitch.
• Employ MAUI Hybrid to extend app reach to iOS and Android while preserving the original UI.

Why It Matters

• Avoid costly rewrites: migrate Silverlight/WPF apps to the modern web up to 3–6x faster in time and cost.
• 100% code reuse: keep your existing UI and business logic intact.
• Run your application on any browser and device without IE/Silverlight limitations.
• Seamless transitions with screen-to-screen parity and minimal retraining requirements.

How to Migrate

• Option 1: Do-It-Yourself
• Use Pro Services Subscriptions and Performance Optimization packs for self-guided migration.
• Schedule a free consultation with our migration experts.
• Option 2: End-to-End Migration by OpenSilver Experts
• Full-service migration to ensure fast delivery and fidelity to the original UI.
• Quick quotes based on your XAP/Silverlight assets.

Supported Platforms & Capabilities

• Runs in all major browsers: Chrome, Firefox, Safari, Edge.
• Supports Windows, macOS, iOS, Android via MAUI Hybrid integration.
• 100% code reuse: leverage existing Silverlight/WPF codebase.
• UI parity: maintain identical screens and user experience post-migration.
• Enterprise-grade controls and libraries compatibility (RIA Services, LightSwitch).
• Ability to mix with Blazor, React, or Angular in the same project.

Safety, Licensing, and Support

• Open source and free to use with professional support available from Userware.
• Migration assistance, SL migration support plans, and Pro Services subscriptions available.
• Custom help: from quick quotes to dedicated migration teams

Core Features

• Free, open-source UI framework for modern .NET web apps (C# and XAML)
• MAUI Hybrid integration for iOS and Android deployment
• AI-enhanced drag-and-drop UI designer
• High compatibility with Microsoft Silverlight and extensive WPF support
• 100% code reuse: reuse Silverlight/WPF codebase with minimal changes
• Run on all major browsers and devices (no IE/Silverlight dependency)
• Blazor, React, Angular compatibility for mixed-stack projects
• Enterprise controls and libraries compatibility (RIA Services, LightSwitch)
• End-to-end migration options and DIY migration pathways

Quick Links

• Download SDK
• Documentation
• Gallery
• Success Stories
• What’s New and Roadmap
• Source code on GitHub
• Migration Service
• FAQ
• SL Migration Support Plans
• Pro Services Subscriptions
• Upload Your .XAP
• Contact Us

Contact & Support

• General inquiries: [email protected]
• Migrations: [email protected]
• Support for subscribers: [email protected]

What People Are Saying

• Repton Projects testimonial highlights successful migration with preserved UI and reduced redevelopment costs.

---

How to Get Started

1. Download the OpenSilver SDK.
2. Review the migration guidance and tools in the Documentation.
3. If migrating a Silverlight/WPF app, upload your XAP for assessment or schedule a consult.
4. Start the migration with either DIY tooling or engage OpenSilver experts for an end-to-end flow.