Because environments were not automatically transferred, developers had to manually move their work:
The migration followed a phased decommissioning of the Azure-based service: Visual Studio Codespaces is moving to GitHub
The original Azure offering allowed for more granular manual control over instance sizes at creation, a feature that was later streamlined in the GitHub implementation . How to Migrate Code Because environments were not automatically transferred
The Visual Studio Codespaces portal was fully retired, and all remaining data was deleted. Major Differences and Improvements Visual Studio Codespaces is moving to GitHub
While both services share the same underlying technology—VS Code running on Linux—the move to GitHub introduced several shifts:
GitHub Codespaces initially defaults to the light GitHub theme, whereas the original service used the VS Code "Dark+" default.