Cosmora Theme Pack

Four dark themes for Visual Studio 2026, installed together:

Each theme colors the IDE and editor, including selections, diff backgrounds, and C#/Razor semantic highlights.

Version 1.0.1 in Visual Studio Community 2026, with C# and Razor editors set to Match Theme.

Install and select

1. Install the extension and restart Visual Studio when prompted. For a manual install, open cosmora-1.0.1.vsix and select your Visual Studio 2026 instance.
2. Choose Theme > Cosmora or another Cosmora variant, then set Editor Appearance to Match Theme.

Compatibility and preview status

Version 1.0.1 is a preview for Visual Studio 2026, Community, Professional, and Enterprise. The installer targets stable API version 17.14 and later, so Visual Studio 2022 17.14 is also eligible but has not been tested. Earlier Visual Studio versions and Visual Studio Code are not supported.

Testing has focused on AMD64. ARM64 is allowed by the installer but has not been verified in use. Runtime review is still incomplete for some semantic colors, overlapping editor highlights, display configurations, and Windows High Contrast. Fonts and Colors overrides and other extensions can affect the result.

Feedback

Report a rendering problem with the affected variant and extension version, full Visual Studio version, steps to reproduce, and a screenshot with private code removed.

Source and installation help · Release notes · Free, under the MIT License.