SkieDo all apps on a Skie managed device come from Google Play?
Yes. Every app in the Skie catalog and your organisation app store is a Google Play app, and your own additions are added by pasting a Play link. Installing from unknown sources is blocked on managed devices, so files from elsewhere cannot be installed. Private APKs are not available yet.
Skie works on any Android 12 or newer phone or tablet in any country where the device has Google Play services. Google Play is therefore the one source of apps for the whole system. That gives you updates, listings you can check, and a clear way to name an app.
On the device, the block on unknown sources is on by default, and it is also applied globally. A student who downloads an installer file from a website or a chat cannot install it. If something did arrive by another route, the install guard removes any app installed after enrolment that is not on the list, silently.
The Play Store itself is a separate decision. You can show it or hide it per policy. Many schools hide it, so students use only the apps placed on their list. Others show it for senior students, while keeping the app list as the authority on what runs. Showing the Play Store does not widen the list.
If your institution has its own app that is not on Google Play, such as an internal tool shared as a file, that is not supported yet. The team is working on it, with no dates. A practical tip is to ask your app vendor to publish a private listing on Google Play, so you can add it by link in the usual way.