XAML.io Has Released Version 0.9 Web IDE
The new update introduces an AI coding agent to streamline C# and XAML web development workflows.
Updated on Sept. 21, 2026 in Software
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XAML.io launched version 0.9 of its browser-based integrated development environment, adding an AI agent capable of writing, building, and fixing code. The platform enables developers to deploy C#/XAML applications to the web using the OpenSilver framework and WebAssembly.
Why it matters
By automating the creation and compilation of code through natural language prompts, this release seeks to lower the barrier for web-based development. The integration with existing tools like Visual Studio allows developers to maintain flexibility while leveraging browser-based AI assistance.
The v0.9 update demonstrates AI capabilities by building a 3,500-line Windows 98 Paint clone in 42 minutes at a generation cost of $57. Users can access $5 of free monthly AI credits, while the Pro tier provides $20 of usage for $20 per month.
The players
XAML.io
This organization provides a web-based integrated development environment focused on C# and XAML application delivery.
OpenSilver
This is an open-source framework used by XAML.io that enables C# and XAML applications to run in web browsers using WebAssembly.
Visual Studio
Developed by Microsoft, this is a widely used integrated development environment that supports the editing and debugging of complex software projects.
The details
The platform runs C# and XAML applications directly in browsers via WebAssembly and integrates with the OpenSilver framework. Projects created within the IDE remain portable, as they can be exported and opened in Visual Studio for further refinement.
Timeline
September 21, 2026: XAML.io released version 0.9 of its web-based IDE.
The Tech Race
This release follows the pattern set by the OpenSilver framework by extending its ability to move traditional desktop-style C# code into modern web browsers. It positions XAML.io as a competitor in the growing segment of browser-first development environments that replace local IDEs.
Developers can now utilize an integrated AI agent to reduce the time required to build and debug complex applications. The option for one-click web publishing significantly lowers the logistical hurdles of moving C# projects from a development environment to a public-facing website.
The takeaway
The move toward AI-integrated web IDEs suggests a future where the distinction between desktop development and browser-based coding continues to dissolve. Developers should consider testing the $5 free monthly tier before committing to the $20 Pro subscription to ensure the AI agent fits their specific workflow needs.
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