Apple's first foldable smartphone, the iPhone Duo, has not yet launched, but developers are already building apps that exploit its unique form factor. The early software transforms the device into a retro Walkman, an accordion, and other interactive tools, leveraging the physical act of folding and unfolding the screen as a core input mechanism. These applications aim to demonstrate that the foldable design enables experiences impossible on traditional iPhones, a distinction that could help justify the device's nearly $2,000 price tag to early adopters.
One prominent example is Duo Man, a music player created by indie developer Vidit Bhargava. The app mimics a Sony Walkman cassette player, requiring users to open the device to select an album and "insert" a cassette tape. Closing the phone starts playback, accompanied by actual recordings of clicks and static from a real Walkman. Bhargava developed the app during a four-hour hackathon last week. He described his inspiration as staring at the device and realizing it opens exactly like a Walkman. "I love the Walkman," Bhargava said. He explained that the concept came from observing how the phone's opening motion mirrored the cassette door mechanism, imagining a scenario where closing the door automatically begins playback. Bhargava has a history with the hardware, having previously modified a vintage Walkman to function only when the user is in motion.
The same San Francisco hackathon that produced Duo Man yielded 73 submitted projects, ranging from games to music tools. Several other apps use the hinge as a functional component of their gameplay or interface. Accorduon turns the hinge into the bellows of a virtual accordion; the speed of folding and unfolding controls the volume of the instrument. Crate, which won first place at the hackathon while Duo Man took second, operates as a beat machine where folding controls effects and snapping the phone open triggers a musical drop. Foldtales uses the hinge to animate a virtual pop-up book, causing castles and trees to rise as the screen opens. Twofold utilizes the partially folded screen to hide player pieces in virtual tabletop games.
Riley Testut, a developer known for Delta, is working on Duo support that could make the phone resemble Nintendo's dual-screen DS. The emergence of these apps echoes the early days of the iPhone, when developers created virtual versions of familiar objects, such as lighters that responded to device movement. Apple is currently years behind Samsung and Google in releasing foldable phones, but its large developer ecosystem may accelerate adoption. The timing coincides with the rise of AI coding tools, which are making it faster to turn quirky ideas into working software. The long-term success of these efforts depends on whether this initial burst of experimentation produces enduring applications and whether Apple sells enough Duos to sustain developer investment.