An indie developer has built an app that turns Apple's upcoming iPhone Duo into a virtual Sony Walkman by using the foldable's hinge to mimic the classic cassette player's flip-open door.

Creator Vidit Bhargava is calling the app Duo-Man, which was designed in BitRig's new iPhone Duo development environment. Bhargava's app lets users open the device to pick their music and "insert" a cassette on the 7.6-inch inner display, then snap it shut to start playback, 80s-style.

Bhargava told TechCrunch he wanted to make the experience feel authentic, so he went so far as to record button clicks and static from a real Walkman for use in the app.

Duo-Man won second place at the recent Bitrig hackathon in San Francisco, and his post about the app on X (Twitter) has gained more than 2.1 million views.

The enthusiastic response has led Bhargava to turn the project into a proper release, and the finished app will support Apple Music and local files, as well as an Apple Pencil feature for "rolling" the cassette loop (a common battery-saving Walkman hack). Depending on its popularity, Spotify support may also be on the cards.

No release date has been announced for the app, but we know when the iPhone Duo is coming: Pre-orders begin Friday, October 16, with availability starting October 23.