Intent determination as a service (IaaS) is disclosed. A third party application may be provided access to an IaaS service. The third party application and the IaaS system may exchange or be provided registration data and information that allow configuration of data and interfaces used in provision of IaaS to the third party application. A query received as input at the third party application may be sent to the IaaS system and the intent of a query may be determined and indicated in a query response sent back to the third party application. A third party application may also interface with a device client application integrated into the operating system of a device as part of accessing an IaaS system. Use of IaaS for queries associated with or relevant to third party applications may extend the capabilities of the third party applications and device client applications.