We've just released @contentful/app-sdk (App SDK) on npm. This package is a renaming of the contentful-ui-extensions-sdk (UI Extensions SDK) and there are no plans to diverge the two.

The App SDK has been created to reduce the confusion caused by building apps using the UI Extensions SDK. All of our documentation and example apps have been updated to use the new App SDK for clarity.

This change does not break any apps or UI Extensions using the UI Extensions SDK. However, we do recommend using the App SDK for any new apps being built.