6 Good Reasons Why 'Tempo' Should be Your iOS Calendar App - CIO

6 Good Reasons Why 'Tempo' Should be Your iOS Calendar App CIO Tempo lets you join prescheduled conference calls without dialing passcodes. 6. Tempo is free, as well as ad-free. All told, Tempo is the best iOS calendar app I've used because it provides built-in context for your appointments and lots of convenient ...