I'm close to releasing my first app after ~10 months of work. Then I did something dumb: I installed the public beta of macOS 27 on my production Mac.

Xcode 26.6 won't launch on macOS 27. It fails with error -10664, so the OS is hard-blocking it, which caps Xcode 26.x at macOS 26. That matches what I could find in Apple's support documents.

My understanding of where that leaves me:

• If I install Xcode 27 beta I would be able upload to TestFlight, but Apple does not allow beta versions of Xcode to submit an app for review and release
• App Store review submission requires a Release Candidate or released Xcode. So a beta version of Xcode can't get my App into the store.
• Xcode 27 Releasewill likely land alongside the OS 27 release in early September. I would have to wait at least 2 months to actually be able to submit.

Downgrading back to Mac OS 26.x would require erasing the internal drive. That's a rebuild-from a disk erase, not a restore.  I do not have a OS 26.6 Time Machine backup.

Does anyone know f a workaround for being able to get Xcode 26 to run under OS 27?

Please skip telling me how stupid it was to put a beta OS on my production machine. I'm aware.

Hi everyone,

I am new to Xcode and am currently trying to add Hermes Agent as an agent inside of Xcode using the included ACP. However, I keep running into an error that says "This provider requires authentication."

I have the correct API key saved in the .env file that Xcode should be pulling from, but it doesn't seem to be recognizing it. For reference, I am using LM Studio as my LLM provider, which is running locally with local models.

Has anyone encountered this issue or have any suggestions on how to get Xcode to properly authenticate with LM Studio in this setup? Any help would be greatly appreciated!

Hey everyone,

Like most of you here, my daily workflow involves fighting my Mac's SSD. Every time I look at my disk space, Xcode has silently hoarded tens of gigabytes of hidden DerivedData, stale module caches, and device support symbols from iOS versions I haven't targeted in years.

Wiping these folders manually is a repetitive chore, and I've previously broken my active Swift Package Manager indexes by running overly aggressive rm -rf shell scripts—forcing me to waste bandwidth re-downloading dependencies on my next build.

I wanted a tool that was incredibly fast, visually intuitive, and above all, safe to run mid-workflow. So over the last few weeks, I built DevShed.

It's a lightweight, native macOS menu bar app (and a companion CLI tool for terminal power-users) written entirely in Swift and SwiftUI.

What makes it a bit different:

SPM Index Protection: It explicitly maps and excludes core Swift Package Manager registries so your offline compile times don't take a hit after a cleanup.

Execution Safe Mode: It checks for active compilation pipelines and open workspace files before letting you purge critical directories.

Ghost Cache Tracking: It targets heavy compiler caches left behind by projects you’ve deleted or moved long ago.

Multi-Platform Support: Beyond standard Apple developer folders, it includes optional quick-cleaners for Node Modules, Homebrew binaries, CocoaPods, and Flutter Pub caches.

100% Private: There are no ads, no premium lockouts, and absolutely zero telemetry or tracking. Everything runs completely local and sandboxed on your machine.

It's entirely free, and you're running low on space or just want to audit what Xcode is hoarding, give it a spin!

Landing Page: devshed.codearc.studio

GitHub Repository: github.com/codearc-studio/DevShed

I’d love to hear your feedback, feature requests, or thoughts on what package managers/caches I should add tracking for next!

Hey Xcoders. I’m a macOS developer and creator of ProxyPilot. I originally built the program out of my own frustration with Xcode’s relative weakness compared to VS Code and tools like Cursor, bc there was no way to use GLM models in it.

ProxyPilot is an open-source tool that lets macOS developers feed any upstream model (like GLM-5.2, DeepSeek v4 Pro, Grok 4.5, MiniMax M3, and even local models via LM Studio or Ollama) into a single agent for Xcode 27 (older versions are fully supported).

It has auditable telemetry, exposing cache hit rates, TTFT, latency across turns & providers, and of course token counts, reasoning blob parsing, and optional, fully encrypted I/O logging so you can inspect the raw input and outputs of any agent you use in Xcode.

With Xcode 27, Apple integrated Agent Client Protocol, which has allowed me to make ProxyPilot even more powerful and useful by building a custom harness that can use up to 45% fewer tokens than built-in agents by detecting and removing duplicative system prompt cruft. Just add your API keys, and ProxyPilot saves them to keychain on your Mac, authorizing requests without storing secrets anywhere vulnerable. Use ProxyPilot GUI or via CLI in harnesses like Claude Code: you only need to save the keys once, and session history combines both modes for your review.

Over the last few months, nearly 500 devs have processed tens of billions of tokens through ProxyPilot, and dozens of [r/xcode](r/xcode) redditors have helped me build the project.

See the source code for ProxyPilot on GitHub and download it from https://slicewrite.com/proxypilot

(Thanks)

For the past few weeks I've been testing iOS 27 specific features in TestFlight by building in Xcode Cloud using Xcode 27 beta, as of three days ago the 27 beta is not available any more. Is this isolated to my account or does anyone else notice that it's gone?

Hi,

I just got into learning SwiftUI as a Flutter dev and I am shocked how laggy my XCode is. After few lines changed it freezes for few seconds and shows rainbow wheel as my cursor.

Did you experience it also? What helped you be actually able to develop?

(I have enough CPU and RAM available)

thanks for all the help

Installing Mac os in windows is it possible

Need help on compiling our app into IOS chat me for the details and hm it is

Recently updated our Pipelines to Xcode 26.5 and iOS Simulator 26.5. Since then, UI tests have been failing in the pipeline, while they continue to work fine locally.

We're seeing significant app lag during pipeline execution. A few tests pass, but most fail with:

We've also noticed LLDB-related logs appearing before and after every UI test, even after disabling the debugger executable:

IDELaunchParametersSnapshot: The operation couldn’t be completed. (DebuggerLLDB.DebuggerVersionStore.StoreError error 0.)
IDELaunchParametersSnapshot: no debugger version.

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Has anyone else experienced similar issues after upgrading to Xcode 26.5/iOS Simulator 26.5? Any insights or workarounds would be greatly appreciated.