Build Modern .NET Web Apps  in C# and XAML, effortlessly

Windows, Android, Mac, Google Chrome, Firefox, Safari… – Build Once, Run Everywhere

Discover the future of .NET web apps with OpenSilver. Our latest 3.1 release offers an AI-enhanced drag-and-drop UI designer, unmatched compatibility with Microsoft Silverlight, and extensive WPF support. Code in C#, VB, or F#, and leverage enterprise-grade controls and libraries, including RIA Services and LightSwitch.

trusted By LeadingBrands

Have a Legacy Silverlight or WPF App?

We can help you migrate it to the modern web, ensuring a result that looks and feels identical to the original, at a fraction of the time and cost of a rewrite.

Option 1: Do-It-Yourself

Want to migrate from Silverlight or WPF to OpenSilver on your own? 
Explore our Pro Services Subscriptions and Performance Optimization pack, or contact us for custom support plans. You can also schedule a free meeting with our experts.

Option 2: All-inclusive End-to-End Migration by Us

Want a fast, cost-effective migration without compromising look or functionality? Our team has over 7 years of experience successfully migrating Silverlight and WPF apps. Read the FAQ, get a quick quote by uploading your XAP file (for Silverlight app), contact us, or schedule a meeting.

NEW – OpenSilver 3.1: First XAML Designer for VS Code!

NEW – OpenSilver 3.1: First XAML Designer for VS Code!

Avoid Costly Rewrites

With OpenSilver, you can transition away from Silverlight or WPF and save up to 3-6X on time and costs.

Run On Any Browser and Any Device

Get away from Internet Explorer and Silverlight limitations. Run your application everywhere.

100% Code Reusability

Leverage your existing Silverlight or WPF code, giving your old projects new life.

Blazor, React, Angular compatible

Considering a switch to other tech stacks? Mix and match with OpenSilver!
Skip the cumbersome rewrite process : keep your existing UI 100% intact, upgrade it —your choice.

Support

As you start migrating, get dedicated support from our team of experts who are always available to assist you along the way.

Identical UI

Screen to Screen parity, no need to retrain users or redo user documentation, a seamless transition to a modern framework.

Avoid Costly Rewrites

With OpenSilver, you can transition away from Silverlight or WPF and save up to 3-6X on time and costs.

Run On Any Browser and Any Device

Get away from Internet Explorer and Silverlight limitations. Run your application everywhere.

100% Code Reusability

Leverage your existing Silverlight or WPF code, giving your old projects new life.

Blazor, React, Angular compatible

Considering a switch to other tech stacks? Mix and match with OpenSilver!
Skip the cumbersome rewrite process : keep your existing UI 100% intact, upgrade it —your choice.

Support

As you start migrating, get dedicated support from our team of experts who are always available to assist you along the way.

Identical UI

Screen to Screen parity, no need to retrain users or redo user documentation, a seamless transition to a modern framework.

Reuse yourCodebase. Improve your app. Run in every browser.

Success Stories

Migrations from Silverlight and WPF to OpenSilver

Find out why leading companies work with us

Repton Projects – The legacy Silverlight application utilized Telerik controls and RIA services. The migrated version retains its appearance, performs faster, and preserves over 99% of the original code, resulting in at least a threefold cost and time savings.

Original

Migrated

Repton Projects, established in 2008, is a client-driven Project Management consultancy formed by merging Intorno Limited and Doctrinu2 Limited. They offer Project on Demand, an online project management system, consultancy services, and training to optimize project investments.

Russ Hatfield

PMC at Repton Projects

5/5

“Facing the challenge of migrating from Microsoft Silverlight to OpenSilver, Userware proved to be the solution we needed. They dispelled our initial skepticism by presenting technical options and demonstrating a commitment to making our project future-proof. Their team delivered a solid and trustworthy solution at a fair price, effectively managing the project and adapting to unforeseen challenges. The result was a successful migration, allowing us to continue selling our software without major redevelopment. We highly recommend Userware for their technical expertise and professionalism.”

How It Works

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Contact Us

Let’s get inTouch

We can help!

For general inquiries, please send an email to: [email protected]

Or reach out to us at : +16505153332 or +33757690570

For migrations-related inquiries (getting a quote, analyzing the compatibility of your code, discussing the technology, etc.), please write to: [email protected]

If you have a Support Plan subscription or would like to subscribe to one, please write to: premium-[email protected]

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