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Windows Insider Program for Developers

Bring even better apps to customers sooner with early access to the latest tools and resources.

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Explore Windows 10 SDK Insider Preview Builds

We regularly release pre-release versions of the Windows 10 Software Development Kit (SDK) to use with the latest Windows 10 Insider Previews. You can also download detailed release notes for each, including details on new APIs, controls, issues, fixes and more. To download the SDK, you must be registered for the Windows Insider Program.

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Share your feedback

Go to the Developer Forum to provide feedback on our Preview SDKs.

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Run your own Insider Program

Many of the same tools that we use with Insiders to develop Windows can now be used to run an Insider program for your own apps. Create new testing strategies, gather deeper feedback from users, resolve issues faster, and keep your entire fan base more informed and engaged.