Most Trusted Calendar

Ive tried them all, Calengoo is the best Google Calendar experience on iPhone or iPad. They may have been late to the game upgrading to the iOS 7 style, but the functionality and syncing is rock-solid. Very active development, with frequent updates. This app runs my family!

UPDATE: Still trustworthy, still my favourite after all these years.

Garafraxa about CalenGoo Calendar, v1.5.38