Hi - I answer from the OpenSmartRoute documentation: routing, the API, plans and quotas, self-hosting. Ask away, or open a support ticket if you need a person.
Grounded in the docs - follow a source before acting on it.
Qt Documentation - Tool - OpenSmartRoute
Toolv0.2.0
Qt Documentation
Search Qt 6 API and product docs (Qt Core, Qt Quick, Qt Creator, Boot to Qt, MCUs).