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Short answer: The general WinUI 3 platform floor is Windows 10 version 1809 (build 17763) or later, including Windows 11. The Windows App SDK version is not a Windows version and is not one universal number for every sample: each sample’s project files and package references determine it.
Microsoft’s current WinUI 3 Visual Studio quickstart calls for Visual Studio 2026, the workloads listed on that page, and Windows Developer Mode. Its command-line route calls for the .NET 10 SDK or later. A separate Microsoft tutorial allows Visual Studio 2026 or the latest Visual Studio 2022, so you should follow the prerequisites for the exact tutorial or repository you are using.
Requirements at a glance
These are the requirements published in Microsoft’s current general guidance. They describe different setup routes and scopes; they are not interchangeable minimums.
| Scope | Published requirement | How to interpret it |
|---|---|---|
| General WinUI 3 platform | Windows 10 version 1809 (build 17763) or later, including Windows 11 | This is the platform baseline, not a guarantee that every sample runs on every supported edition or device. |
| Current Visual Studio quickstart | Visual Studio 2026, the required workloads listed by Microsoft, and Developer Mode | Use the setup instructions on the current WinUI 3 quickstart. |
| Current command-line quickstart | .NET 10 SDK or later | This is the command-line path. It is not a universal Visual Studio minimum. |
| Separate Visual Studio tutorial | Visual Studio 2026 or the latest Visual Studio 2022 | Microsoft’s tutorials can state different IDE requirements because they are maintained as separate pages. |
| Windows AI Samples | A Copilot+ PC in addition to the normal Windows development setup | This is a sample-specific hardware condition, not a general WinUI 3 requirement. |
The general platform information is on Microsoft’s WinUI 3 page and the Windows App SDK system-requirements page.
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Do not confuse the three version numbers
Windows version
Windows is the operating system on which the app runs. Microsoft publishes Windows 10 version 1809, build 17763, as the general WinUI 3 floor. Windows 11 is included because it is newer than that baseline. You can check a machine’s installed version and build by running winver; the dialog shows the Windows release and OS build.
Windows App SDK version
The Windows App SDK is the development and runtime framework that delivers WinUI 3 and other Windows app capabilities. Its release number is independent of the Windows operating-system build. A sample can therefore target a particular Windows App SDK package while running on several supported Windows releases.
Microsoft does not publish one Windows App SDK release number that applies to every WinUI 3 sample. The applicable version is the one selected by that sample’s source: its project files, package references, central package-management files, or repository instructions. Treat a version found in one sample as that sample’s dependency, not as a framework-wide minimum.
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Visual Studio is one development environment; the .NET SDK is the command-line and build toolchain used by .NET projects. Microsoft’s quickstart gives separate prerequisites for those routes. Installing Visual Studio 2026 does not remove the need to meet a sample’s project, package, or hardware requirements, and installing the .NET 10 SDK is not the same as installing Visual Studio.
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Windows compatibility: what the 1809 floor does and does not promise
Windows 10 version 1809 (build 17763) is the published general platform floor for WinUI 3. It tells you that the framework is designed to support that release and newer Windows versions, including Windows 11. It does not prove that a particular repository has no stricter condition.
A sample may depend on an API, runtime component, device capability, architecture, or package configuration that raises its practical minimum. The authoritative answer for that sample is the combination of its README, solution and project files, target framework, package references, and any hardware notes. If those instructions conflict with a generic platform statement, follow the sample-specific instructions and record the exact repository and revision you used.
Visual Studio requirements depend on the Microsoft page you are following
The current WinUI 3 quickstart
Microsoft’s current quickstart asks Visual Studio users to install Visual Studio 2026, the workloads identified in the quickstart, and Windows Developer Mode. The page is the right reference when you are following its Visual Studio project-creation flow. Workloads can change as Visual Studio releases change, so use the labels shown on that page rather than copying a workload name from an older blog post.
Developer Mode is a Windows setting that permits development scenarios used by the quickstart. Enable it from the Windows Settings area labelled For developers; the exact navigation can vary slightly between Windows releases. If the project wizard reports that Developer Mode is required, enable it, restart the relevant tooling if requested, and create the project again.
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A separate Microsoft tutorial
Microsoft’s tutorial for creating a first Windows App SDK application with XAML and C# says Visual Studio 2026 or the latest Visual Studio 2022. That wording is deliberately broader than the current quickstart’s Visual Studio 2026 wording. It should not be rewritten as a single universal rule that every WinUI 3 sample requires Visual Studio 2026 or, alternatively, that every sample supports every Visual Studio 2022 update.
When documentation appears to disagree, identify the page and sample first. Note the URL, the page’s displayed update date, and the repository revision if one is given. Then install the version accepted by that specific workflow. A solution created from an older template can also carry project settings that differ from a newly generated project.
Why an IDE version mismatch matters
Visual Studio supplies project templates, MSBuild integration, designers, debuggers, and package tooling. A newer sample can depend on template or SDK features absent from an older IDE, while an older sample may open successfully in a newer IDE but still require its original package references. The IDE version therefore answers “which tools create and build this project?”; it does not answer “which Windows App SDK package does this project use?”
Using the command-line route with the .NET 10 SDK
The command-line variant of Microsoft’s current WinUI 3 quickstart calls for the .NET 10 SDK or later. The templates bring the NuGet packages required by the generated project. This route is separate from the Visual Studio prerequisite and is useful on machines where you prefer an editor and terminal or need repeatable scripted setup.
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- Install the .NET 10 SDK or a later SDK supported by the quickstart.
- Open a terminal and run
dotnet --list-sdks. Confirm that a 10.0-or-later SDK is listed; the command reports installed SDKs, not just runtimes. - Use the template and commands shown in Microsoft’s quickstart. Do not substitute commands from a different sample without checking that sample’s README.
- Restore and build from the generated solution or project. If package restore selects a different Windows App SDK version than the sample expects, stop and inspect the project’s package references before changing the SDK installation.
Having .NET 10 installed does not make an older Windows host compatible with a sample that requires a newer operating-system build or special hardware. It only satisfies the toolchain prerequisite for this command-line path.
How to find the exact Windows App SDK version for a sample
Because there is no single version number for all samples, use this inspection sequence before troubleshooting a build.
- Read the sample README first. Look for sections named Requirements, Prerequisites, Setup, Supported versions, or Troubleshooting. Follow any version pin or repository-specific installation command exactly.
- Inspect every project file. In Visual Studio, open the solution and review each project’s package references. From a terminal at the sample root, you can search common project and build files with
Get-ChildItem -Recurse -Include *.csproj,*.props,*.targets | Select-String -Pattern 'WindowsAppSDK'. Check the displayedVersionvalue rather than assuming that the newest package is correct. - Check central package-management files. A repository may keep versions in a shared properties file instead of in each
.csproj. A project reference can therefore look unversioned while a central file pins the actual package. - Record the target framework and architecture. The target framework, platform target, and solution configuration can affect which packages and native components are selected. Record these values along with the Windows App SDK package version.
- Check deployment mode and native dependencies. Packaged and unpackaged projects can have different setup instructions. If the README names a runtime, installer, device, or feature requirement, treat it as part of the sample’s minimum setup.
- Keep projects consistent. Multi-project solutions can contain a main app, class libraries, tests, and packaging projects. Confirm that their Windows App SDK references are compatible before changing one project in isolation.
This process gives you an auditable answer such as “this repository pins package version X in its project configuration,” rather than an unsupported claim about every WinUI 3 application.
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Windows AI Samples
Microsoft’s Windows AI Samples page lists a Copilot+ PC requirement for that sample collection. That condition is stricter than the general Windows 10 version 1809 platform floor. A machine can meet the operating-system and Visual Studio requirements and still be unable to run that sample because it lacks the specified hardware class.
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Other samples
Do not infer hardware requirements from the WinUI 3 platform baseline. For every other sample, look for explicit notes about graphics hardware, sensors, neural-processing capabilities, connected services, enterprise policy, or a required Windows edition. If the repository does not state such a requirement, describe it as “not stated” rather than guessing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A reliable preflight procedure
- Identify the exact source. Record the sample name, repository URL, branch or release, and the Microsoft page you are following.
- Read its prerequisites. Capture the stated Windows version, Visual Studio or .NET SDK version, workloads, Developer Mode requirement, architecture, and hardware conditions.
- Check Windows. Run
winverand compare the reported build with the general floor of build 17763. If the sample states a newer minimum, use the newer value. - Choose one toolchain. Follow the Visual Studio route if the sample is documented around the IDE; follow the command-line route when the instructions specify the .NET SDK and templates.
- Install only the listed workloads and SDKs. Use the current Microsoft page for workload names and avoid relying on an old screenshot or copied checklist.
- Enable Developer Mode when required. Confirm the setting before creating or deploying the project.
- Verify package references. Write down the Windows App SDK version selected by the project and check all projects in the solution.
- Build before modifying dependencies. Restore packages and build the unmodified sample first. This establishes whether the problem is environmental or caused by a later change.
- Run the sample on the intended device. A successful build on a development PC does not waive a sample’s hardware or OS conditions.
- Use Microsoft’s testing guidance. For test planning and validation of Windows App SDK and WinUI 3 apps, consult Microsoft’s testing documentation rather than treating a single successful launch as full compatibility evidence.
Decision matrix for common situations
| Your situation | Use as the starting requirement | Next check |
|---|---|---|
| You are creating a new project from the current WinUI 3 quickstart in Visual Studio | Visual Studio 2026, the quickstart’s listed workloads, Developer Mode, and Windows 10 build 17763 or later | Confirm the generated project’s Windows App SDK package reference. |
| You are following the command-line quickstart | .NET 10 SDK or later and the quickstart’s Windows baseline | Run dotnet --list-sdks, then inspect the generated project and restored packages. |
| You are following the XAML and C# Visual Studio tutorial | Visual Studio 2026 or the latest Visual Studio 2022, plus that tutorial’s listed setup | Use the tutorial’s own instructions if they differ from the general quickstart. |
| You downloaded an existing sample | The sample README and project configuration | Find its exact Windows App SDK version, target framework, architecture, and hardware notes. |
| You are running Windows AI Samples | The general setup plus a Copilot+ PC | Verify the device meets that sample-specific condition before debugging software. |
Troubleshooting version and setup failures
The OS is below build 17763
Upgrade Windows before investigating NuGet or Visual Studio errors. The machine is below Microsoft’s general WinUI 3 platform floor, so a successful package restore cannot make the host supported.
The template is missing in Visual Studio
Recheck that you installed the workloads named by the exact Microsoft quickstart or tutorial, that Visual Studio is the version accepted by that page, and that Developer Mode is enabled when required. Restart Visual Studio after installing components, then use the sample’s documented creation path instead of an unrelated template.
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Inspect project files, shared properties files, and lock files for the version that the sample pins. Do not replace it with the newest release simply because it is available; a sample can depend on APIs or packaging behavior associated with its specified version.
The project builds but will not run on another PC
Compare the second PC’s Windows build, architecture, deployment prerequisites, and hardware with the sample README. The general 1809 floor is not a substitute for a stricter sample-specific condition.
Microsoft pages list different Visual Studio versions
Use the page tied to your workflow and preserve its wording. The current quickstart and the separate Visual Studio tutorial are distinct sources with different stated prerequisites; neither should be silently generalized to all WinUI 3 samples.
The practical answer
Start with Windows 10 version 1809 (build 17763) or later, then choose the toolchain named by the sample: Visual Studio 2026 and Developer Mode for the current Visual Studio quickstart, or the .NET 10 SDK or later for its command-line route. Treat the Windows App SDK number as a project dependency that must be read from the sample’s own files. Finally, check for stricter repository or hardware conditions, such as the Copilot+ PC requirement listed for Windows AI Samples.
Quick Recap
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