9 Unique Apps to Try on the iPhone Duo

Apple's first foldable phone, the iPhone Duo, has attracted a lot of attention from indie developers who have created unique apps to take advantage of its hinge and larger screens. Here are nine special apps that stand out on the iPhone Duo:

Battlefleet Duo is a board game that offers a grand canvas on the larger 7.6-inch screen, with ships visible on the smaller bottom screen during tabletop mode. Players can engage in local multiplayer battles across from each other, just like traditional Battleships, with free battles every day and a one-time $5 purchase for unlimited matches.

Flipcorder turns the iPhone Duo into a retro camcorder, offering a simple pleasure for those reminiscing about pre-smartphone days. The outer display shows a "closed lens," while opening the Duo "takes the cap off" for recording. The user interface is retro, with a filter that emulates VHS, and videos are cataloged by day for easy viewing.

RectoVerso is a flashcard app that uses Apple Intelligence to automatically create flashcards based on your classroom notes or PDFs. When you slightly open the iPhone Duo, the answer gradually appears, allowing you to test your knowledge before fully opening it. The app supports importing decks from Anki or creating your own and is priced at $13.

PianoFold is a rhythm game that lets you play blocks reaching the middle crease when you tap the corresponding column. You need to time your taps perfectly, with 40 levels across eight chapters, each rated out of three stars. The first two chapters are free, with full access costing $5.

Toastie is a $3 app that challenges you to construct a sandwich on the inner screen using specific recipe instructions. You must close the iPhone for a few seconds, like grilling, to complete the sandwich. There are only 10 recipes, making it quick to complete but still offering a unique experience.

Portal lets you relax or focus using soothing soundscapes and visual vistas on the iPhone Duo. You can listen to lava bubbling or waves crashing in tabletop mode or on the outer screen in tent mode. The app offers over 100 sights, from Iceland's black beaches to UK woodlands, and costs $3 per month or $30 per year for full access.

FirstSeed Planner aims to be a new calendar app optimized for the iPhone Duo. The developer has enabled Duo support, letting you view the calendar and daily planner on separate screens. You can drag-and-drop actions between the halves of the screen and even handwrite notes using stylus support in the future. The app is free, with Pro features like automatic backups and weather forecasts costing $3.49 per month or $90 for lifetime access.

Delta Emulator is a popular retro gaming emulator that has just rolled out an update supporting the folding iPhone Duo. By propping the Duo at a 90-degree angle, you can enjoy custom skins for various games, recreating the classic gaming experience on this new device.