# API

This section provides information about Qualcomm® AI Engine Direct API.

- [Overview](https://docs.qualcomm.com/doc/80-63442-50/topic/api_overview.html)
- [Usage Guidelines](https://docs.qualcomm.com/doc/80-63442-50/topic/api_usage_guidelines.html)
- [QNN API Revision History](https://docs.qualcomm.com/doc/80-63442-50/topic/api_version_history.html)
- [Backend Specific Revision History](https://docs.qualcomm.com/doc/80-63442-50/topic/api_version_history.html#backend-specific-revision-history)
- [QNN System API Revision History](https://docs.qualcomm.com/doc/80-63442-50/topic/api_version_history.html#qnn-system-api-revision-history)
- [Supported APIs](https://docs.qualcomm.com/doc/80-63442-50/topic/supported_api.html)
- [Supported Capabilities](https://docs.qualcomm.com/doc/80-63442-50/topic/supported_capabilities.html)

## C

- [Class Hierarchy](https://docs.qualcomm.com/doc/80-63442-50/topic/class_view_hierarchy.html)
- [File Hierarchy](https://docs.qualcomm.com/doc/80-63442-50/topic/file_view_hierarchy.html)
- [Full API](https://docs.qualcomm.com/doc/80-63442-50/topic/unabridged_api.html)
- [Error codes](https://docs.qualcomm.com/doc/80-63442-50/topic/api_error_codes.html)

Last Published: Oct 10, 2025

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