The present disclosure provides techniques and solutions for enhancing or customizing the functionality of software applications, such as “apps.” More particularly, the present disclosure provides for grouping app extensions into groups, such as groups representing a particular semantic domain. A group of extensions can be applied to one or more apps. Applying extensions as a group can save development time and effort, as can the ability to apply a given extension group to multiple apps, either at the same time or over a particular time period. Further disclosed aspects assist users in implementing extensions with an extension group, such as assisting in determining where in a user interface particular extensions should appear. Once an extension group has been selected to be applied to an app, programmatic logic can cause the extensions to be automatically implemented in a computing artifact/object used by a particular extended app.