| title | description | ms.topic | ms.date | ms.localizationpriority |
|---|---|---|---|---|
Differences between Office Scripts and Office Add-ins |
The behavior and API differences between Office Scripts and Office Add-ins. |
product-comparison |
02/13/2023 |
medium |
Understand the differences between Office Scripts and Office Add-ins to know when to use each one. Office Scripts are designed to be quickly made by anyone looking to improve their workflow. Office Add-ins integrate with the Office UI for a more interactive experience through ribbon buttons and task panes. Office Add-ins can also expand built-in Excel functions by providing custom functions.
:::image type="content" source="../images/office-programmability-diagram.png" alt-text="A four-quadrant diagram showing the focus areas for different Office extensibility solutions. Both Office Scripts and Office Web Add-ins are focused on cross-platform experiences and collaboration. Office Scripts cater to end users, whereas Office Web Add-ins target professional developers.":::
Office Scripts run to completion with a manual button selection or as a step in Power Automate, whereas Office Add-ins continue running depending on how they are configured. For example, you can configure an Office Add-in to continue running even when its task pane is closed. This means that Office Add-ins maintain state during a session, whereas Office Scripts don't maintain an internal state between runs. If the solution you're building requires a maintained state, you should visit the Office Add-ins documentation to learn more about Office Add-ins.
The rest of this article describes on the main differences between Office Add-ins and Office Scripts.
The following table shows which features are supported by which platforms and products.
[!INCLUDE Platform support table]
While the Office JavaScript APIs for Office Add-ins and the Office Scripts APIs share some functionality, they are different platforms. The Office Scripts APIs are an optimized, synchronous subset of the Excel JavaScript API model. The major difference is usage of the load/sync paradigm with add-ins. Additionally, add-ins offer APIs for events and a broader set of functionality outside of Excel, known as the Common APIs.
Office Add-ins offer greater connectivity to external web services and libraries. Office Scripts are limited to specific external calls.
Office Scripts do not support workbook-level events. Scripts are either triggered by users selecting the Run button for a script or through Power Automate. Every script runs the code in a single main function, then ends.
Office Scripts can only interact with the workbook, not the task pane. If you need authentication, dialog windows, or additional UX and UI controls, you'll need to create an Office Add-in instead of an Office Script.