Delta Is Getting iPhone Duo Support. It Still Will Not Play 3DS Games.

Q: How good will DS games look on the iPhone Duo?

Very good. Holding it with the hinge between the two screens leaves room for 4x integer scaling per screen, or 1024 by 768 each. Holding it in normal portrait allows 6x for a stacked image but puts the crease through the middle of it. Delta has not said which arrangement it will use.

Affiliate disclosure: This guide contains affiliate links. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you. Learn more.

2026-09-12 · News and analysis

Affiliate disclosure: This guide contains affiliate links. As an Amazon Associate, we earn from qualifying purchases at no extra cost to you. Learn more.

Delta is getting dedicated support for Apple's new foldable. Riley Testut said so himself, which makes this one of the rare emulator stories that starts with a developer statement rather than a rumour.

The appeal is obvious. The Nintendo DS had two screens and a hinge between them. The iPhone Duo has two screens and a hinge between them. Nobody needed a press release to make that connection.

Then the connection got extended. A lot of the chatter has landed on the idea that this is Delta 2.0 and that it will bring 3DS emulation along with DS. That second part is not true, and it was never part of the announcement. Here is what was actually said, and what the hardware can actually do.

The Short Version

What was confirmed: Delta is planning dedicated iPhone Duo support, aimed at Nintendo DS emulation across the two screens
Who confirmed it: Riley Testut, Delta's developer, responding on Delta's Threads account
His exact words: "Yes, the plan is to have dedicated support for the Duo in Delta (though we're not officially announcing an exact launch date quite yet)"
Launch date: not announced
3DS support: not mentioned, not planned, and not something Delta has ever had
Version number: no official version number was given
The hardware: iPhone Duo, 7.6 inch inner screen, 5.4 inch cover screen, $1,999 to start
When you can buy it: preorders 16 October 2026, shipping 23 October 2026
What Delta costs: free, on the App Store, no sideloading

The 3DS Part Is Not Happening

This needs saying plainly, because it is the single most repeated thing about this story and it is wrong.

Delta does not emulate the 3DS. It never has. The systems Delta covers are NES, SNES, Nintendo 64, Game Boy, Game Boy Color, Game Boy Advance, Nintendo DS and Sega Genesis. That is the whole list. There is no 3DS core in the app, no 3DS core announced for the app, and nothing in what Testut said that points at one.

The confusion is easy to understand. The 3DS also had two screens. A foldable phone with two screens sounds like it solves the 3DS problem and the DS problem at once. But the screens were never the reason 3DS emulation is hard. The reason is the hardware underneath, which is a generation beyond the DS and needs a completely different emulator.

If you want 3DS games on an iPhone today, the app is Folium, which is paid and which bundles Game Boy, DS and 3DS emulation together. We cover it in our guide to emulating retro games on iPhone. Whether Folium does anything special with the Duo is a separate question that nobody has answered yet.

So treat this as a DS story. On its own terms it is a good one.

Why a Foldable Actually Suits the DS

Almost every DS emulator on a phone makes the same compromise. You have one screen and the game wants two, so you either stack them and accept that both end up small, or you shrink one into a corner, or you hide one entirely and swap when the game demands it.

None of those are good. They are just the least bad options available on a slab.

A book style foldable changes the problem. Hold the Duo so the crease runs horizontally and you have two display halves with a physical hinge between them. That is not an approximation of a DS. That is the actual physical arrangement a DS had.

Testut also pointed at why this is buildable rather than just appealing. The work he did on iPad Stage Manager support gave Delta the groundwork for handling more than one display region at once. The dual screen problem was already half solved before the hardware existed.

The Screen Maths Is More Awkward Than It Looks

Here is where enthusiasm needs a little arithmetic. We ran the numbers ourselves, because the fit is not as clean as the concept.

The iPhone Duo's inner display is 1878 by 2670. The cover screen is 1398 by 2034. A Nintendo DS screen is 256 by 192, and the two of them stacked make a 256 by 384 image.

For pixel art, what you want is integer scaling. Multiply every pixel by a whole number and every pixel stays the same size and shape. Use a fractional number instead and some pixels get duplicated while others do not, which is where that faintly smeared, uneven look comes from.

So how does it fit? It depends entirely on how you hold it, and the two options pull in opposite directions.

Hold it in normal portrait, crease running vertically. The full 1878 by 2670 inner display swallows a stacked DS image at 6x, which is 1536 by 2304. That is a huge image, far beyond what any slab phone manages. The problem is that the crease now runs straight down the middle of both DS screens. You have put a vertical seam through the centre of every sprite in the game.

Rotate it so the crease runs horizontally. Now each half of the inner display is roughly 2670 by 939, and the hinge sits exactly where a DS hinge sat. This is clearly the arrangement the whole idea is built on. But each DS screen is now limited by the height of its half, so you get 4x, which is 1024 by 768 per screen. Still excellent. Just not the 6x the raw panel size suggests, and you will have wide black bars either side of the image.

There is also no aspect ratio that saves you. Both of the Duo's screens are close to 10:7, which works out to about 1.43. A stacked DS image is exactly 1.5. Those are near each other but they are not equal, so some letterboxing is unavoidable no matter which way round you hold it.

The cover screen, for completeness, fits a stacked DS image at 5x, which is 1280 by 1920. That is a genuinely good DS experience on a closed phone.

None of this is a complaint. 4x per screen with a real hinge in the right place is better than any phone DS setup that exists today. The point is that the headline version of this story implies a perfect fit, and the panel dimensions say otherwise.

What This Costs

The iPhone Duo starts at $1,999 for 256GB and runs to $3,199 for 2TB. Preorders open 16 October 2026 and it ships 23 October 2026, with iOS 27.1.

That is a two thousand dollar DS. It is worth saying out loud, because the device that does this job properly costs about fifty dollars.

A budget Linux handheld will not touch DS emulation well, but the Android tier handles it comfortably, and a dual screen handheld gives you the same two screen arrangement for a rounding error of the Duo's price. If DS games are the goal rather than a side effect of buying a flagship phone, the hardware answer has not changed.

Check Retroid Pocket 5 Price on Amazon

Our best handhelds for DS and 3DS emulation guide covers the devices that do this for a fraction of the cost, and the Retroid Pocket Duo is the dual screen option aimed squarely at this use case. Worth noting that the Retroid Pocket Duo and the iPhone Duo are completely unrelated products that happen to share a word.

What We Still Do Not Know

Plenty, and the gaps are the interesting part.

No launch date. Testut explicitly declined to give one. The phone ships 23 October. Delta's support may or may not land near it.
No orientation details. Nobody has said whether the two DS screens go across the crease, or how Delta handles the crease at all.
No word on the cover screen. A DS game on a closed foldable is an obvious feature and has not been mentioned.
No controller or touch input details. DS games need stylus input, and how that works across a hinge is an open question.
No version number. "Delta 2.0" is circulating but was not officially stated.

Frequently Asked Questions

Will Delta support 3DS games on the iPhone Duo?

No. Delta has never emulated the 3DS and nothing in the iPhone Duo announcement suggests that is changing. Delta covers NES, SNES, N64, Game Boy, Game Boy Color, GBA, DS and Genesis. For 3DS on iOS, the app is Folium, which is paid.

When does Delta's iPhone Duo support launch?

No date has been announced. Riley Testut confirmed the plan exists and specifically said an exact launch date was not being announced yet. The iPhone Duo itself ships 23 October 2026.

Is this update called Delta 2.0?

No official version number was given. The "2.0" label is circulating in coverage of the teaser image but was not part of the developer's statement.

Does Delta cost money?

Delta is free on the App Store with no sideloading needed. One exception: Sega Genesis support is tied to a Patreon subscription. Everything else, including DS, is free.

How good will DS games look on the iPhone Duo?

Very good. By our own maths, holding it with the hinge between the two screens gives you room for 4x integer scaling per screen, or 1024 by 768 each. Holding it in normal portrait allows 6x for a stacked image but puts the crease through the middle of it. Delta has not said which arrangement it will use.

Do I need an iPhone Duo to play DS games on an iPhone?

No. Delta already emulates the DS on any modern iPhone. The Duo adds a second physical screen and a hinge, which removes the awkward compromise of squeezing two screens onto one slab. It is a comfort upgrade, not a capability one.

Is a foldable iPhone the cheapest way to play DS games?

Not remotely. The iPhone Duo starts at $1,999. An Android handheld in the $200 range handles DS emulation comfortably, and dual screen handhelds exist specifically for this. See our best handhelds for DS and 3DS emulation guide.

Written 12 September 2026. Delta's iPhone Duo support has no announced release date and no published feature list, so the details here will change. The scaling figures are our own arithmetic, not Delta's stated behaviour.