Top Contacts funktioniert nicht

With built-in calendar and to-do list you can plan and track all activities of your contact list while all your valuable data is synced across devices via iCloud.  Top Contacts – an advanced contact manager that adds powerful CRM features to the familiar list of contacts.  Top Contacts boosts your productivity by keeping you in sync with the right people at the right time.  Log all relevant information, events, tasks and files for each contact direct in the app.  You no longer need to synchronize across multiple apps.  Get it now and say hello to a seamless contact management! * Sync with Mac requires Top Contacts for macOS, sold separately.