There is a new list condition to help you know who has been using apps other than the web interface. The "Authorized Application" condition will find everyone who has used a certain app in the last 90 days.
Planning Center apps, such as Church Center, Music Stand, etc., are available in the list, along with any third party apps that are connected to your church's account.
This can be used to help you know who your Church Center users are, and can help you audit which third party applications have been given access to your data.
This condition is only available to Managers, and up to 90 days of history is available.