Rubberduck is first and foremost a project aiming to bring the VBIDE functionality into this century, free of charge for all its users.

The project started in late 2014 as a C# port of a test runner tool written in VBA; it didn’t take too long to realize we could easily take the code in the editor, tokenize it, process it, analyze it, and then provide a wide array of developer tools to enhance the VBIDE experience.

Rubberduck is about learning, and paying forward: the project co-founder wrote their very first lines of C# for Rubberduck, and several contributors later did the same. Core contributors are always happy to guide new ducklings toward their first pull request!

Rubberduck is also about teaching: inspections will not just tell you that Option Explicit is missing, it will also explain why you want Option Explicit enabled everywhere. Many inspection ideas stemmed from questions frequently asked on Stack Overflow, and again explain what’s going on and why that might be a problem. If you’re new to VBA, Rubberduck inspections can teach you things about how VBA works, that many veterans took years to learn about!

The project’s blog presents new releases and upcoming features, and frequently proposes intermediate/advanced VBA topics revolving around object-oriented programming and clean code. A dedicated repository was created to host all VBA code examples from blog articles.

Rubberduck 3.0

Rubberduck has pretty much reached the limits of what it could achieve with its current v2.x architecture. The code base is mature and works well, but its structure does not allow us to pursue the goals we had envisioned for v3.x - thus, project planning has now begun for Project Cucumber, at the end of which we'll have a new v3.0 Rubberduck platform to build upon and continue enhancing.

Rubberduck 3.0 will introduce the Rubberduck Editor, a Language Server Protocol (LSP) client that will defer all the language processing to a dedicated LSP server process... exactly like a modern IDE does.

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Rubberduck ads published on Meta Stack Overflow over the years


Rubberduck was made possible with the combined knowledge of many people, and depends on several libraries and projects.


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