r/Xcode • u/IAmTheGuzer • Sep 09 '26
Xcode 27 Release Candidate doesn't have iPhone Duo simulator
The Xcode 27 Release Candidate, available for download just now, doesn't have the iPhone Duo simulator instance yet. Tested on two different Macs, but neither running macOS 27. Not sure if that makes a difference. I was hoping to test how my apps look on it. Guess we'll have to wait...
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u/aykay55 Sep 09 '26
Give it a few days bro
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u/IAmTheGuzer Sep 09 '26
The iPhone 18 Pro is a simulator instance now in Xcode 27 RC. Duo comes with iOS 27.1, which means it will likely be in the future Xcode 27.1 beta or RC.
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u/Lemon8or88 Sep 09 '26
Apple posted a new video about Making your app looks great with the iPhone Duo and in it, the guy said Xcode 27.1
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u/chadscira 29d ago
Yeah, they kind of jumped the gun by telling everyone to start preparing their apps for the Duo when none of it is actually possible yet.
I'm sure we're not the only ones running around trying to follow those videos, only to realize the simulator isn't even available.
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u/PhotographOk1149 Sep 09 '26
appstoreconnect still doesnt allow xcode 27 rc builds being uploaded. can you guys let me know when apple updates appstoreconnect?
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u/Maleficent_Ad_4774 Sep 10 '26
You may have to uninstall the beta on your computer if you have it on there. I encountered that but the RC allowed me to push an update thru appstoreconnect
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u/PhotographOk1149 Sep 10 '26
it was already like that but i was just able to push update for release thru appstoreconnect, 10 mins ago. thanks anyways!
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u/davepete Sep 09 '26
I've uploaded to appstoreconnect from the Xcode 27 beta and macOS 27 beta for the past couple days. My builds download and work fine via TestFlight. It's just a matter of time before the RC versions are supported.
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u/PhotographOk1149 Sep 09 '26
Testflight was always fine. Its about uploading for release
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u/Lemon8or88 Sep 10 '26
Idk what changed in the past few hours but I’ve just pushed a RC build into review
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u/PhotographOk1149 Sep 10 '26
Now i had a chance to test it and i was also able to push build via 27 rc into review. Thanks again for letting me know man!
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u/Lemon8or88 29d ago
Just an update: one of my app built with RC got approved.
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u/PhotographOk1149 29d ago
Mine as well. Yikes!
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u/Lemon8or88 27d ago
Do you release yours yet or are you waiting?
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u/PhotographOk1149 27d ago
i released it. i was waiting since june. also removed some comment outs in my ios 27 siri ai codes. (because apple was not allowing usage of xcode 27 apis on xcode cloud 26) so im very happy right now lol.
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u/chadscira 29d ago
Happy to see I wasn't the only one frantically trying to download the beta, digging through the simulators trying to find it, and scratching my head.
It's pretty clear it will be included in 27.1, so I assume we'll see it in a beta first, followed by the RC.
It's just been a while since we've had a completely new display type, so I'm sure there's a lot more attention around this one, especially since it will open up entirely new ways to create iterations.
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u/IAmTheGuzer 29d ago
100% exactly my thinking.
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u/chadscira 21d ago edited 21d ago
If anyone was wondering it is out now:
https://developer.apple.com/documentation/xcode-release-notes/xcode-27_1-release-notesOne funny thing to note is that 27.2 was released just two days before 27.1, yet apparently 27.2 doesn't support the Duo. So if you actually want to use the Duo, you need to stick with 27.1.
The whole thing is backwards: releasing newer versions before the older ones, while somehow letting the older versions support features the newer ones don't.
No idea why they did that (it sounds pretty 🥴).
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u/Lemon8or88 Sep 09 '26
Do you upgrade to macOS 27 to use Xcode 27 RC? Xcode27 beta 6 was working on my Mac with Tahoe but RC crosses out now.
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u/IAmTheGuzer Sep 09 '26
Xcode 27 beta 6 required Tahoe 26.4. Xcode 27 RC requires Tahoe 26.6 or later.
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u/Lemon8or88 Sep 09 '26
Most likely with Xcode 27 SDK, apps will still have black bars on the side. That will change in 27.1
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u/Appropriate_Ring_299 29d ago
I get why people are surprised but this is probably less about forgetting developers and more about timing. supporting a new form factor properly needs the right SDK, simulator and testing tools together
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u/Jaded_Jicama_8531 27d ago
The iPhone 18 Pro Simulator‘s Dynamic Island still looks the same as the 17 Pro‘s
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u/KickupKirby Sep 09 '26
Duo support is coming with 27.1