The apps which use the Winbiz Cloud API can be sold only through the Winbiz App Store.
The apps and connectors which don't use the API can't be sold through the Store, but they can obviously be sold by the developer through other channels.
This second kind of apps can however be published on the Business solutions.
It is also possible to develop apps that are interfaced both with the API and the local Winbiz installs.
In this case, the version interfaces through the API can be sold only through the store, while the traditional one can't (they can obviously be sold by the developer though other channels).