Multiple iPhone Duo reviews covered the device's thermal properties, and reviewer opinions varied. Some found that it was just warm, while others thought it was running too hot at times.


Joanna Stern said the back of the device got warm when using FaceTime and taking photos. She had to end a ‌FaceTime‌ call during testing because it got too hot. "Yeah, I'm gonna burn my hand off," she said. "This thing is getting really warm."

Apple told her the warmth was a sign of the iPhone Duo's thermal design moving heat away from the chip to keep performance up. "But to me, it just feels like the phone is really warm," she said.

The ‌iPhone Duo‌ has the same custom vapor chamber setup and A20 Pro chip as the iPhone 18 Pro, but the vapor chamber is thinner. Apple added a flexible graphite pipe in the hinge to transfer heat between the two halves, giving more surface area for heat dissipation.

The Verge said the ‌iPhone Duo‌ heats up when using the camera for a long time, especially if both displays are on for features like Duo Preview. "You can just feel the phone getting significantly hotter when this happens," reads the review. "The phone gets hot enough to start noticeably lagging after a while." The site also said it gets hot when running third-party apps, particularly video apps and apps from Google.

PetaPixel's review unit got warm when gaming, photo editing, or doing anything that stressed the processor, with the heat felt on the right side of the unfolded device.

Mrwhosetheboss did a 20-minute stress test with the ‌iPhone Duo‌ and ‌iPhone 18 Pro‌ Max. He found the ‌iPhone Duo‌ trapped heat inside when it was closed, and ‌iPhone Duo‌ performance was below the ‌iPhone 18 Pro‌ Max. When open, the ‌iPhone Duo‌ has a large high-resolution display that also affects performance. Mrwhosetheboss focused more on performance than heat, and said the difference between the ‌iPhone Duo‌ and ‌iPhone 18 Pro‌ Max isn't "massively" noticeable in day-to-day use.

HTX Studio did a 30-minute gaming test with the ‌iPhone Duo‌ and ‌iPhone 18 Pro‌ models. The ‌iPhone Duo‌ was 46.5°C, while the ‌iPhone 18 Pro‌ and Pro Max were at 43.8°C and 43.2°C, respectively. The ‌iPhone Duo‌ had a 20 percent lower frame rate than the ‌iPhone 18 Pro‌ models and it couldn't maintain 300 nits brightness, dropping to 185 nits.

9to5Mac said the ‌iPhone Duo‌ "runs a bit hotter than the ‌iPhone 18 Pro‌, but not in a way that impacts performance." Tom's Guide did a benchmark heat test and found that the ‌iPhone Duo‌ was able to spread heat evenly across the body of the device, but it was a few degrees hotter than the Galaxy Z Fold8 the site compared it to. The ‌iPhone Duo‌ scored 75.9 percent stability score on the 3DMark stress test, compared to 79 percent for the ‌iPhone 18 Pro‌ Max and 72 percent for the Z Fold8.

Gizmodo didn't find heat to be a problem, saying the vapor chamber "does a solid job cooling it down to prevent lag or slowdown" when apps use "all the CPU and GPU cores."

The ‌iPhone Duo‌ launches this Friday, so we don't have long to wait to see if heat is going to be a problem for the everyday user.
This article, "Does the iPhone Duo Run Hot? Here's What Reviews Found" first appeared on MacRumors.com

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Anthropic today introduced Claude Duet, its answer to Meta's Muse agent and OpenAI's Dots agent. Like Dots and Muse, it is a proactive agent that "reaches out before you ask."


Claude Duet connects to your apps and suggests things that need your attention. It completes tasks and can work in the cloud without local access to a computer. As with Muse and Dots, Duet has a virtual machine with its own browser to complete tasks.

Anthropic says it built Duet for professionals and small business owners with too much to track, as those are the people most likely to find it helpful.

Duet is built around Opus 5.5. It sends a short brief each morning on important items from connected apps, then checks apps every few hours and sends an alert when something needs attention. It can complete simple administrative tasks or more complex tasks like building web apps. While the agent works on its own, it will get user approval before it takes actions like sending a message, making a payment, signing a document, or deleting a file.


It incorporates memory, skills, and connected apps from a Claude account, so there isn't much setup involved. Interactions happen in one ongoing thread instead of across different conversations.

Claude Duet does not see passwords or logins when given access to accounts, and it has a dedicated classifier and safety system prompt that checks each message and guards against sensitive information leaks.

Claude Duet is a standalone product that's available in a research preview right now with access granted via waitlist. It's limited to Pro and Max subscribers in the United States, and can be used via the web or a standalone Duet iOS app. Duet uses your existing Claude plan limits, and its background checks will count toward them.
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Apple hasn't shared iPhone Duo hinge tests or given a lifetime fold number like Samsung, but Joanna Stern used a custom device to subject her review unit to more than 32,000 folds over four nights.


Over the course of the testing, Stern said she thought it might be feeling looser as the number of folds increased, but her final conclusion was that she couldn't feel much of a change. A calibrated push-pull gauge used to take readings before and after the Duo fold test showed the hinge was actually stiffer than before.

But in everyday use, I really couldn't feel a difference. So, after 32,000 folds, it felt pretty much the same as day one, which is pretty darn impressive.

Stern didn't comment on whether the fold test caused the crease to be more visible, which can happen over time with other foldable devices. Her testing was done with a case on, and while the machine opened the Duo flat, it didn't close it all the way each time.


Samsung's foldable displays undergo official testing, and in 2025, the display used for the Galaxy Z Fold7 passed a 500,000-fold durability test. Samsung Display says that translates to over 10 years for average users folding their device about 100 times a day, or over six years for users who fold it more than 200 times daily.

Until Apple shares information on display and hinge durability, Stern's test is all we have to go on. It's unlikely to be the last unofficial folding stress test that we see over the next few weeks.

The full details on Stern's machine, including how it was built, can be found in her YouTube video, and she has more information in her review writeup.
This article, "What 32,000 Folds Did to the iPhone Duo's Hinge" first appeared on MacRumors.com

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The iPhone Duo's inner screen has an under-display front camera that's largely hidden from view. It's the first time we've seen an under-display camera on an iPhone, and it turns out there's a reason Apple hasn't used the technology before.


Apple said the camera offers 1080p video recording, but didn't mention photo quality. Gizmodo said it's a 4-megapixel camera and described the photos as "low-res, washed out, and just not sharp at all." It's not good for selfies, and even video calls "look muddy."

Marques Brownlee said the camera is "very first gen" and that the photo quality is "trash." Samsung previously used under-display cameras but dropped them because of poor image quality. Brownlee speculates whether Apple will make the same decision in the future.

Reviewers say the camera is better at video than photos, and it does disappear into the background when you're using the phone, which is a plus.

The ‌iPhone Duo‌ has an alternative 12-megapixel front-facing camera on the outer display, which is much better for selfies, plus with the dual displays, you can use the rear cameras to take selfies. PetaPixel says that if you unfold the Duo and point it at yourself, there's an option to move the camera controls to the outer screen. With that setup, you can use the outer display as a viewfinder for the rear camera to take a selfie.

More ‌iPhone Duo‌ reviews can be found in our review roundup.
This article, "iPhone Duo's Hidden FaceTime Camera Takes 'Trash' Photos" first appeared on MacRumors.com

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Some upright MagSafe charger designs won't work well with the iPhone Duo when it's unfolded. As demonstrated by Mrwhosetheboss, the uneven weight of the ‌iPhone Duo‌ can cause it to tilt on a charger when it's open.


The ‌MagSafe‌ ring on the back of the ‌iPhone Duo‌ is only on one half, and some chargers don't have strong enough magnets to hold up the Duo with the extra weight on one side. iPhones do have an extra anti-rotation magnet at the bottom of the magnetic charging ring, but some chargers aren't designed to use it.


On Reddit, some users pointed out that The Verge's Nilay Patel demonstrated the ‌iPhone Duo‌ charging horizontally on a ‌MagSafe‌ charger with no issue, so it may not be a universal problem.

Charging with the ‌iPhone Duo‌ open and in portrait orientation likely works, but it looks like the safest way to use upright ‌MagSafe‌ stands is with the ‌iPhone Duo‌ closed. A flat charger won't have the same rotation issue.

Companies will likely make wider stands with some kind of ledge to hold the Duo upright when unfolded, but if you plan to use the Duo on a desk, be aware that there will be positioning limitations with some ‌MagSafe‌ chargers.

The ‌iPhone Duo‌ launches on Friday, October 23.
This article, "iPhone Duo Tips Over on MagSafe Stands When Unfolded" first appeared on MacRumors.com

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Apple today updated its Apple Support app to add support for the iPhone Duo and iOS 27.1 (which the Duo ships with). Apple Support will now display properly on the ‌iPhone Duo‌'s wider screen, and it can be used alongside other apps in Split View.


‌iPhone Duo‌ reviews went live today, and poorly sized apps are a recurring complaint among reviewers. Apps that aren't updated for ‌iPhone Duo‌ are letterboxed, with thick black bars on each side.

Apple will continue adapting its apps for the device, and we should see plenty of third-party ‌iPhone Duo‌ app updates in the coming weeks. Any major change to screen size results in early hiccups, but a few months from now, ‌iPhone Duo‌ app compatibility will be largely fixed.

Apple Support is Apple's dedicated app for troubleshooting device issues and looking up support documents. It is a free download from the App Store. [Direct Link]
This article, "Apple Support App Updated for iPhone Duo's Larger Display" first appeared on MacRumors.com

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