Announcing the March 2015 Update of XAML Spy (version 2.7.0). This version adds full support for the Windows 10 Universal Application Platform (UAP). Apps targetting UAP can run on any Windows device, including phone, tablet, laptop, Xbox, etc. Today Windows 10 apps are developed using the Windows 10 Technical Preview tools, released by Microsoft earlier this week.
Additionally, XAML Spy now has proper support for WPF apps targetting .NET 4.6.
For more details about this update see the release notes. The latest installer is available in the downloads section.