Where do we start from?
Paper registrations and check-in do not allow for a certain kind of flexibility. For example, making last minute changes to the attendee list would require the manual entering of their details which could take quite some time. This would not be an issue with online check-in apps which would allow such details to be updated over the air instead.
Furthermore, modifications to existing data is made smoother and neater with check-in software. In practice, they make it easy for the attendee to request and update accommodation status, food preferences, preferred activities and much more. All of that is done in such a way that beats having to cross the details out from a piece of paper – or simply issuing another piece of document to that effect.
In the same vein, keeping close track of the data is made possible. While papers can get lost and missing, the information from online options will be stored in the cloud forever. That way, it can always be accessed anywhere and at any time, as long as the viewer has the required permissions to view such data.