I believe it only runs on Android. It is intended to get its data from QGIS, whether live over the network or offline.
You would set up the map layers and attribute list in QGIS on your large screen desktop/laptop computer. Then you would open up the ‘project’ on your mobile device and be able to create and modify those layers in the field.
QField is supposed to be powerful, but with a very simplistic interface. So you are limited to only what is set up in the ‘project’ framework. I think the idea for QField is that the field technician only has to deal with things directly related to the project, rather than having deep menus full of tools and plugins and options.
Here are some links to posts on this forum that have mentioned QField in the past:
