I expect that most apps will look rather broken on release, but it will be smoothed out eventually.
How many customers do you expect to be running on Duo for the first year of its existence?
I’d be surprised if it was >0.01% for anyone. Apple wants you to drop everything to support all the bells and whistles for their new device, but even if you take 3 months to fix minor layout bugs, I don’t think it’s that big of a deal.
I have friends who dropped everything to support the Vision Pro, and I don’t think any of them felt like it was worth it in retrospect. Even the ones that got featured by Apple as a result didn’t see more than a few thousand downloads.
They should remember that they got quite a bit of social capital within Apple by doing that and hopefully they're keeping those relationships warm. But yeah Vision Pro hasn't turned out to be a big ecosystem so far.
Vision Pro will be cancelled at some point, it’s just nowhere near popular enough and never will be - the air has gone out of that VR bubble.
I wouldn’t be surprised if duo is also cancelled because it is another copycat move which is not central to Apples business and will not be mass market.
That social capital and $5 will buy me a cup of coffee.
> I have friends who dropped everything to support the Vision Pro
The VP was a niche device for a niche market. Phones are not that. I think the Duo will do very well. The one knock are the cameras do not match the Pro. I don't think will care though.
How is that possible? iPhones have had varying screen sizes for more than a decade, how could any app still have a fixed size?
I bet it's due to product managers not caring about those.
How do you figure? Assume the average Apple cell phone replacement cycle is somewhere between 3 and 4 years. At the longer end, you’d need the sell-through rate of the Duo compared to other phones to be less than 0.04% to hit your number. We know from the Mini and other phones that Apple tends to avoid designs that it expects to have less than a 5% sell rate, two orders of magnitude higher. Even if you assume they’re aiming for 5% of dollars instead of units, and you take into account the non-Apple market (which certainly should not be unit-weighted for folks thinking about app revenue), you’re off by well over an order of magnitude.
I've also noticed a flurry of recent app updates from some of the bigger apps (MLB, NYTimes, etc.) to switch to the Liquid Glass menu which I assume Apple strongly suggested they do prior to the Duo launch.
Interestingly, Instagram decided to implement a custom liquid-glass like tab bar which surely now turns to be a PITA.
I don’t think it'll be "most apps".
Apple all but told developers in June [1] to update their apps not to assume a fixed screen size.
One of the apps Apple's engineers demonstrate new features was called Origami [2]. When I watched the video, it seemed pretty clear: a device that folds was in our future.
If you’re a developer that's kept up with the latest iOS developments, you'll be in good shape for the Duo.
But if you're up to your eyeballs in technical debt using deprecated frameworks and APIs… it's probably gonna be a while for you.
[1]: https://developer.apple.com/videos/play/wwdc2026/278
[2]: "Modernize your UIKit app" — https://en.wikipedia.org/wiki/Origami
Tongue half in cheek, my point is that agents may be unreliable with fresh libraries.
It looks like there are some fun edge cases too:
> A reserved region can be active or inactive. For example, a reserved region that represents the fold is active when iPhone Duo is partially open, but inactive when it is fully open.
source: https://developer.apple.com/documentation/technologyoverview...
You may find Axiom (my FOSS project, updated for iPhone Duo) helpful. https://charleswiltgen.github.io/Axiom/
Note: I'm scrubbing it against the final 27.1 beta SDK as I type this, so it's likely that its Duo knowledge will get an update within the next few hours.
I thought the ideas of the surface duo were great and I’m super excited to see them evolved and shipped in a product that I think a lot of people are going to love.
Sadly, many apps will continue to look rather broken.
There are still thousands of apps that still look wrong on iPad 16 years after its release, even with the 2x button pushed, for no good reason.
I think I heard that Instygram only recently figured it out.
I mean, don't expect advanced features like consistent smooth scrolling, non-broken UI, absence of animation flickers, cloud sync that works consistently even for paid apps developed by Apple or anybody else but other than that :)
For instance, very few company bothered to do anything for the Vision Pro. Now we'll see if Google or Microsoft for instance see the iPhone Duo as a main line product or an exotic offshoot that needs to prove itself before any money is spent on it.
How many years has it been for them to release an upscaled (zero extra features!) version of instagram and whatsapp for iPad?
Two of the most used apps in the world
My brain must have blocked out the 'cadence' (oh the corpo speak!) of corporate dev out of self preservation.
Depends on how far back you go.
Apple's current docs suck, and they have, for a long time (SwiftUI was so bad, that someone came up with this[0], and it was a lifesaver).
But I'm old enough to remember Inside Macintosh[1], and that was a thing of beauty.
Apple used to take technical documentation very seriously. Many of their technical writers had better tech chops, than the engineers making the stuff they wrote about.
Historically it was very good. Back when I was writing Mac and iOS apps in objective-c, Apple's docs were some of the best.
I don't think they won't work, but I anticipate oddities to appear for a while, especially for older applications.
I assume other apps will have have the same, since our team is super small compared to everyone else.
Here are some screenshots from getting my own app compiled, if anyone is interested:
https://bsky.app/profile/cameronbanga.com/post/3mvsrxk5q7b2j
https://bsky.app/profile/cameronbanga.com/post/3mvss5wmxej2l
We're not talking about 0/1 here. There's making sure the app works and looks ok on the Duo and then there's building out Duo specific features. The works/looks ok is generally pretty easy with new devices. Just build with the new SDK and fix places where the app wasn't doing something likely already suggested by Apple. A big one will be safe areas which people often ignored except on the top and bottom.
As a professional programmer, it at least gratifies me to know this is the attitude I'm competing against.
I'm not an iOS developer, never made an app at all, I asked because I'm curious. What is it really to gain?
Nothing ventured, nothing gained.
Will you see noticeably more users or people choosing another alternative because you didn't specifically building the app for Duo?
I haven't done iOS development in a long time, but my understanding is that if your iPhone app is designed well and uses all of Apple's recommended methods, adjusting for different screen sizes and orientations is fairly easy.
If you decided to go cheap/easy/dumb from the outset, then you made your bed, and now you get to lie in it.
But its form factor has been validated for almost a decade now from other manufacturers. So iPhone Duo will do fine. It will not surpass a slab iPhone but fine.
Vision Pro was a completely new beast, the hardware was not there, the market was not there.
It's worth noting that "niche" in this case means ~10M in its first year, comparted to an estimated 250M Apple smartphone shipments in 2027. So far, Apple has sold ~600K Vision Pro in total.
Also, supporting Duo is not an enormous lift if you're already supporting resizable windows, as developers are required to do for OS 27.
And that means nothing. Because other manufacturers are not doing well either.
I’m not doubting that there’s demand for it but I wonder who/where?
If we're comparing anecdotes, when I lived in the states far from sf many tech people I knew had folding phones. They loved them and I was curious, but I like iOS.
I spend a lot of time in hospitals, and I see doctors with them.
That may also explain why Apple isn't too worried about the price.
People famously said that of the first iPhone, expensive at the time.
Then about the $1k iPhone X.
Apple have made phones a fashion accessory and status symbol. I won’t be surprised if the Duo sells extreme well, even by iPhone standards.
iPhone apps must function on iPad in iPhone-compatibility mode, apps must support window resizability as of OS 27, and apps can't detect iPad and refuse to run. And I don't think this is new, but setting the target to iPhone-only doesn't prevent iPhone apps from running on iPad.
I really wanted to use it as my primary computing display, but as is almost always the case with Apple, the amazing hardware was hamstrung by the crippled OS.
Even just being able to use it as a generic display i.e. with a Nintendo Switch would have been amazing.
Resources:
https://developer.apple.com/search/?q=iphone%20duo
Axiom: https://charleswiltgen.github.io/Axiom/ (my FOSS project, updated for iPhone Duo)