I've built a C# IDE, Runtime, and AppStore inside Excel
The project is called QueryStorm. It uses Roslyn to offer C# (and VB.NET) support in Excel, as an alternative to VBA. I've posted about it before, but a lot has changed since then so figured I'd share an update. The current version includes a host of new features, namely a C# debugger, support for NuGet packages, and the ability to publish Excel extensions to an "AppStore" (which is essentially a NuGet repository). The AppStore can be used by anyone with the (free) runtime component. Another great addition is the community license, which is a free license for individuals and small companies…
In plain words
QueryStorm is a C# and VB.NET IDE, runtime, and app store integrated into Excel as an alternative to VBA. It includes a debugger, NuGet package support, and lets developers publish extensions to an AppStore accessible to anyone with the free runtime. The tool is designed for Excel users and developers who want to build and share Excel extensions using modern .NET languages. A community license provides free access for individuals and small companies.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
The project is called QueryStorm. It uses Roslyn to offer C# (and VB.NET) support in Excel, as an alternative to VBA. I've posted about it before, but a lot has changed since then so figured I'd share an update. The current version includes a host of new features, namely a C# debugger, support for NuGet packages, and the ability to publish Excel extensions to an "AppStore" (which is essentially a NuGet repository). The AppStore can be used by anyone with the (free) runtime component. Another great addition is the community license, which is a free license for individuals and small companies to use. It unlocks most features, but it isn't intended for companies with more than 5 employees or over $1M in annual revenue. I would love to hear your feedback and am happy to answer any technical questions about how QueryStorm is implemented.
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