The following table summarizes differences between the standard Revit API and the Revit Macro API.
| Feature or Capability | Standard Revit API | Revit Macro API |
|---|---|---|
| Declaration | Must implement IExternalCommand interface and its Execute method. | Declare a public method with no parameters and void return type in the ThisApplication or ThisDocument class. |
| Application object | Access the Application object through externalCommandData.Application | The Application keyword in C#, VB.NET, Ruby, and Python points to the Application object for application-level macros. For document-level macros, Document.Application points to the Application object. |
| Ribbon | API external applications can create RibbonPanels, RibbonItem, PulldownButton and PushButton for each external command through an external application. | Not supported. |