The iOS app has recently been upgraded in response to user feedback. Users are now able to store personal data (’records’) of when they visited the tower, when they rang a peal, or a quarter peal there.
The free version of the app provides for only a limited number of such records (in order to demonstrate the facility), but an inexpensive upgrade allows for an unlimited number of such records. Provision is made for such data to be backed-up in a user-specified DropBox folder and thus it can be edited and re-downloaded as desired.