OI App Center is a user interface for app reviews. It is build in a way that any website, app or location can be reviewed, however, for now the focus is on Blockstack app.
Developers can now add a link for app review to the decentralized review platform build on blockstack. A typical link looks like this:
The actually link is provided on https://app-center.openintents.org if you claim your app.
Users can store and publish (via Radiks) as many reviews as they want. However, only the latest review is displayed and considered when calculating the average score on OI App Center.