Custom Functions requirement sets

Custom Functions use separate requirement sets from the core Excel JavaScript APIs. The following table lists the Custom Functions requirement sets, the supported Office client applications, and the minimum builds or versions for those applications where applicable.

Requirement set	Office on Windows - Microsoft 365 subscription - retail perpetual Office 2016 and later	Office on Windows (volume-licensed perpetual)	Office on Mac	Office on iPad	Office on the web
CustomFunctionsRuntime 1.4	Version 2208 (Build 15601.20148)	Not supported	16.64	Not supported	Supported
CustomFunctionsRuntime 1.3	Version 2008 (Build 13127.20296)	Office 2021: Version 2008 (Build 13127.20296)	16.40.20081000	Not supported	Supported
CustomFunctionsRuntime 1.2	Version 1909 (Build 11929.20934)	Office 2021: Version 1909 (Build 11929.20934)	16.34.20020900	Not supported	Supported
CustomFunctionsRuntime 1.1	Version 1903 (Build 11425.20156)	Office 2021: Version 1903 (Build 11425.20156)	16.34	Not supported	Supported

CustomFunctionsRuntime 1.1, 1.2, 1.3, and 1.4

• Requirement set 1.1 is the first version of the API.
• Requirement set 1.2 adds the CustomFunctions.Error object to support error handling.
• Requirement set 1.3 adds XLL streaming support and new ErrorCode options to the CustomFunctions.Error object.
• Requirement set 1.4 includes custom functions integration with data types and the allowCustomDataForDataTypeAny JSON manifest property to support the data types integration.

See also

• Custom Functions Reference Documentation
• Excel JavaScript API requirement sets