The iPhone Duo, a new foldable smartphone from Apple, has not yet been released, but it has already caught the attention of app developers. Vidit Bhargava, an independent developer, recently shared a prototype application called Duo-Man on the social platform X. The name is a nod to the Sony Walkman, a portable music player that became popular in the 1980s. Duo-Man mimics the physical interaction of using a Walkman, with users opening the iPhone Duo, selecting an album, and "inserting" a virtual cassette. When the device is closed, playback begins, using both of the phone’s screens. The 7.6-inch internal screen allows users to browse their music library and load the cassette, while the 5.4-inch external screen displays playback controls with virtual buttons. According to Bhargava, the idea for Duo-Man began as a playful experiment during a hackathon organized by Bitrig in San Francisco. The project won second place there, but the video Bhargava posted on X gained widespread attention, with over 2.1 million views and nearly 10,000 likes. Encouraged by the response, he decided to turn the prototype into a real application. The app is designed to create an authentic experience, with sounds like button clicks and the "breathing" of a tape recorded from a real Walkman. Users will be able to play digital tracks as if they were listening to physical cassettes. The application will support music files stored on the device, and Bhargava is working on integrating Apple Music as well. He mentioned that the visual design and the connection to Apple's services still need refinement, and support for Spotify may be added later. The Apple Pencil is also expected to play a role, allowing users to manually rewind the tape, similar to how people used pencils to conserve battery on older Walkman models. Features like fast-forward and rewind will replicate the behavior of a real cassette player. While similar ideas have been explored before, Duo-Man stands out by using the foldable phone's hinge mechanism. Other apps, such as DeliTape, which has simulated a rotating cassette for over a decade, and WalkStar, a 2025 app that stops music when a user stops walking, have used single-screen interfaces. Duo-Man, however, uses the physical action of opening and closing the phone to control the music experience. Bhargava has not yet announced a release date or price for Duo-Man, as the iPhone Duo is not yet available for purchase.