Best iPhone Duo apps to download on day one, by fold pose

Apple’s first foldable, the iPhone Duo, started reaching customers on Oct. 23, 2026, and developers already have apps that react to the hinge. MacRumors rounded up 15-plus of them with prices, and 9to5Mac and Android Authority covered the biggest update, Delta 2.0.

A flat list doesn’t help much when you’re holding a half-folded phone. This one is sorted by pose: seated, tent, book and closed. Prices are as MacRumors listed them at publication.

Which iPhone Duo apps work best seated?

Tiny Computers is the seated-mode pick at $3.99. MacRumors says it turns the Duo into a retro computer, and that it works best seated. The machines on offer range from the Amiga 500 and Commodore 64 to a Macintosh, along with the iMac G3, iBook G3 and more.

Each machine has a clickable keyboard, games, paint programs and easter eggs. It’s a one-time purchase, which makes it the easiest paid app on this list to say yes to.

Apps that suit tent mode

Two apps in the roundup are tied to tent mode: Portal and Living Earth. Both are built around showing something pretty on a large, standing display, so they work as a desk or nightstand piece more than a tool.

Portal is a relaxation app with over 100 nature locations, calming sounds, breathing exercises, and focus and sleep timers. It fills the whole display when unfolded. Three free portals refresh monthly, and the subscription runs $2.99 a month or $29.99 a year.

Living Earth costs $5.99 once. It shows the time, local weather, a spinnable globe, and live clouds, storms and weather maps. The globe fills the display when unfolded.

Book mode: coloring, notebooks and a DS

Open the Duo like a book and you get one large inner display. The apps that take advantage are the ones that want a full page: a coloring app, a notebook and, per 9to5Mac, a Nintendo DS emulator.

Lake is an adult coloring app that gives a full-page surface in portrait. The basic version is free. Premium is $9.99 a month. Its developer says an Apple Pencil update is coming, though no date has been given.

TypeDraw costs $4.99. It looks like a notebook when closed and opens to writable pages, with Apple Pencil support plus custom colors, fonts and handwriting. It’s the only app in the roundup stated to work on regular iPhones too.

If you want to draw or write on the Duo, an Apple Pencil is the accessory that matters, since both TypeDraw and Delta’s DS mode use it.

Closed-Duo apps: toast, cassettes and a tiny city

Several developers built apps around the moment you shut the phone. Closing the Duo is the input, and the outer screen is where the payoff shows up.

• Toastie ($2.99): build a grilled cheese sandwich, then close the Duo to toast it without burning it.
• Fold & Squish (free): from the maker of Tiny Computers. Paint on one half, close the Duo, rub the outer display, then reopen to see Rorschach-style art.
• Deck-Man ($4.99): a cassette-player music app that starts playback when you snap the Duo shut.
• Fold Focus ($5.99 a month): a pomodoro timer that rewards keeping the Duo closed by building a virtual city.
• Orisuji ($4.99): a paper-maze puzzle game that moves from the inner display to the outer one.

In an Oct. 7 post on X, Tom Szykulski, who appears to be on the Toastie team, wrote, “We turned the iPhone Duo into the world’s most expensive toaster”. That post predates the Duo reaching customers, and his role isn’t stated.

Fold Focus is the one I’d think twice about. A timer at $5.99 a month costs more than most of the one-time apps here combined with a free one.

Apps that play with the hinge angle

A few apps care less about which pose you’ve chosen and more about the angle itself. MacRumors doesn’t tie these to a specific pose, so they sit here.

Fold Accordion ($2.99) uses the hinge as bellows and has a learn mode that lights up keys. Foldissimo is another accordion app, with no price reported. Duometry ($2.99) asks you to fold the Duo to match a target angle. Foldfish, a fishing game, and Nitelore, an anti-gravity racing game, are both free.

Delta 2.0 covers every pose, with some caveats

Delta, the emulator, is the biggest update so far. Version 2.0 adds Duo support, a Liquid Glass interface, Sega Genesis compatibility and RetroAchievements. Genesis games get cheats, save states and their own controller skins. Delta also plays NES, SNES, N64, GBC, GBA and DS games.

According to 9to5Mac, it ships controller skins designed for each Duo pose. The DS layouts use the full inner display and span the crease in portrait book mode. Android Authority describes it a little differently: in a half-folded or tabletop position, the touch controls go on the lower display and the game on the upper one. Apple Pencil works as the DS stylus.

Close the Duo and Delta reflows to the outer portrait screen. Folding it shut puts a DS game to sleep, like the real handheld.

There’s a Split View trick too. With the phone turned sideways, 9to5Mac says Delta shows the bottom screen of the emulated DS as a custom keyboard view. That lets it stretch across the full width of the display and overlap the other app, rather than being held to the usual 50% share. The description comes from a screenshot of a single example.

Delta 2.0 also gets improved library navigation and audio settings that let game audio mix with music or podcasts already playing. It’s on the App Store, and on AltStore PAL in the EU. Outlets differ on the launch date: 9to5Mac dated it Oct. 22, while Android Authority presented it as news on Oct. 23.

Which iPhone Duo apps are free and which cost a subscription?

Five apps are free to start: Fold & Squish, basic Lake, base Delta, Foldfish and Nitelore. Three charge by the month: Portal, Lake premium and Fold Focus. Delta’s premium tier is also a subscription, but no price has been reported.

MacRumors lists Delta as free, while 9to5Mac says the premium tier needs an in-app subscription on the App Store, available worldwide. Both can be true: the base app is free and the extras aren’t. Patreon support is also available in the US, EU, Brazil and Japan.

The eight one-time purchases with listed prices (Tiny Computers, Toastie, TypeDraw, Fold Accordion, Living Earth, Duometry, Deck-Man and Orisuji) run from $2.99 to $5.99 each.

What to install first if you just unboxed a Duo

Start with the free ones: Delta, Fold & Squish, Foldfish and Nitelore cost nothing and show you how the hinge and outer screen behave. Then buy Tiny Computers for $3.99 if you want something that feels made for this phone.

Hold off on the subscriptions until you’ve used a free tier. Portal gives you three free portals a month to judge it by, and Lake’s basic version is free.

The timing matters. Android Authority says early Duo reviews complained about weak app support, and frames Delta’s update as a response. That complaint comes from that outlet alone, but a list of hinge-aware apps on launch day is a better start than none.

What’s still unknown

The reports don’t give the iPhone Duo’s price or specs, so this guide can’t tell you whether the phone itself is worth buying. Nor do they say how many apps have been updated for it, or how big the app-support gap really is.

Only TypeDraw is stated to run on regular iPhones, so it’s unclear whether the rest are Duo-only. Delta’s premium subscription price hasn’t been reported, and neither has a date for Lake’s Apple Pencil update. 9to5Mac’s Split View overlap rests on one screenshot, and it’s not known whether Apple could change how that behaves.

Frequently asked questions

What are the best apps for the iPhone Duo?

For seated mode, Tiny Computers ($3.99). For tent mode, Portal and Living Earth ($5.99). For book mode, Lake and TypeDraw ($4.99). For closed mode, Toastie ($2.99), Deck-Man ($4.99) and Fold & Squish (free). Delta 2.0 covers every pose.

Can you play Nintendo DS games on the iPhone Duo?

Yes, through Delta 2.0. It has controller skins for each Duo pose, uses Apple Pencil as the stylus and puts DS games to sleep when you close the phone.

Is the Delta emulator free?

The base app is listed as free by MacRumors. 9to5Mac says the premium tier is unlocked through an in-app subscription on the App Store. The subscription price hasn't been reported.

Does Delta support Sega Genesis?

Yes. Delta 2.0 adds Genesis compatibility, with cheats, save states and dedicated controller skins. It also plays NES, SNES, N64, GBC, GBA and DS games.

Sources

This article was compiled from reporting by the following outlets. Links go to the original reports.

1. MacRumors: The iPhone Duo Can Be a Tiny Mac, a Toaster, and a Nintendo DS
2. 9to5Mac: Retro game emulator Delta looks great on the iPhone Duo
3. Android Authority: Delta emulator now lets you turn your iPhone Duo into a Nintendo DS