Apple says more than 100,000 apps are optimized for iPhone Duo

Susan Prescott, Apple’s vice president of Worldwide Developer Relations, credited developers’ creativity and said the company was grateful for how quickly they had embraced the device. She said Apple was also encouraged by the pace of updates as more apps are optimized for the Duo.

The growing catalog has not eliminated problems with individual apps. At launch, users said Instagram was “a little messy” despite carrying Apple’s “Made for iPhone Duo” label. Instagram chief Adam Mosseri described the device as a “bit of a tricky form factor.”