The ArcGIS Runtime API Reference for Qt C++ and QML is a set of references that describe the details of all public types and members used to create custom apps for Linux, iOS, Android, Windows, and macOS.

C++ API Reference
For building apps with C++ and either a Qt Quick or Qt Widgets UI.

QML API Reference
For building apps with Qt's QML language and a Qt Quick UI.

Toolkit API Reference
Contains UI and augmented reality components that you can use with the ArcGIS Runtime API for Qt.

QML Extras API Reference
Complements the Qt Framework by providing additional QML types to make it easier to write complete cross-platform apps without using platform-specific code.