How can I sync with iPhone and iPad?

Awesome calendar works with whatever calendars you have set up in the iOS settings area (Settings->Mail, Contacts, Calendars). So, each device must have the same setup for them to stay in sync; the sync is not between devices but between your remote calendar and your device.
If the issue persists, try to reboot your device or refresh the calendar list by using iCal which is Apple's native calendar!

Feedback and Knowledge Base