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(WINdows RunTime) The Windows programming interface (API) that superseded Win32 and debuted with Windows 8. WinRT allows developers to create safe "sandboxed" touchscreen applications available from the Microsoft Store. WinRT apps support both the x86 and ARM architectures and multiple programming languages, including C/C++, C#, Visual Basic and JavaScript. WinRT was augmented by the Universal Windows Platform (see UWP). See Win32.

WinRT vs. Windows RT
WinRT is the API, while Windows RT was the operating system for ARM-based tablets when Windows 8 was introduced. Windows RT was the first operating system that required developers to employ the WinRT APIs. See Windows RT, Windows 8 and Windows 8.1.

A Peculiar Name
The "Runtime" in WinRT is an odd name for a programming interface (API) because every API represents operating system modules that must be "running" in order to work. The common convention for the term "runtime" is a third-party, non-OS module that must be loaded; for example, a Java interpreter. Strange naming is however very common in the industry (see naming fiascos).

When Windows 8 was introduced, developers had to use the WinRT API in order to create the new tablet-style apps.
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References in periodicals archive ?
The Win32 and Win64 API, on the other hand, is common to all versions of Windows, and now that WinRT apps also run in a window, there is no longer a sharp distinction from the user's perspective.
Coding apps with the Windows API, rather than WinRT, will ensure they run on Windows 7, 8 and 10.
Most significantly, Windows RT devices will not run existing Windows 7, Vista and XP applications, but rather only new ones created with the new Windows runtime WinRT APIs.
The key features are integrated into the product report designers for HTML 5 and WinRT.
The first report designer for WinRT is developed by the company specialists.
WPF/SILVERLIGHT/WINRT Edition - for Windows Presentation Foundation 4.0 and 4.5, Silverlight 4.0 and 5.0, WinRT (Windows Store apps)
Our flagship product, XFINIUM.PDF, is a PDF component covering all .NET and Mono platforms: .NET 2.0-4.5, Windows Forms, ASP.NET Webforms and MVC, console applications, Windows services, Mono, Windows Presentation foundation, Silverlight 4 & 5, Windows Store applications (WinRT), Windows Phone 7 & 8, Mono.iOS and Mono.Android
Smolensk, Russia, March 08, 2013 --( Stimulsoft Company is pleased to announce the report designer for WinRT is now live.
The report designer for WinRT has the required set of features to create reports of any complexity.
Software products for WinForms, ASP.NET, ASP.NET MVC, Silverlight, WPF, WinRT, HTML5 form the product line Stimulsoft Reports.