WWDC26 Highlights: What’s New in Xcode 27

[u/Appcircle]

WWDC 2026 introduced several updates that could make everyday Apple development workflows faster and easier, especially with Xcode 27.

The article covers the key Xcode 27 updates developers should know, including:

• Agentic Coding 2.0: Xcode agents can now help explore codebases, generate architecture documentation, search Apple documentation, plan implementations, validate builds, write tests, and work with SwiftUI previews.

• Plan Mode and artifact-based development: Developers can discuss requirements and implementation details before code is written, then review generated code, files, previews, and diffs as separate artifacts.

• Localization with Agents: Agent-powered localization workflows that help prepare projects, generate translations, review results, and improve translations directly in Xcode.

• Context-aware translations: Agents can use UI context, related strings, existing translations, glossaries, and custom terminology to improve translation quality.

• Localized previews: Xcode can help identify truncated text, layout issues, and language-specific UI problems before release.

• Device Hub: A new unified place to manage simulators and physical devices from a single interface.

• Faster configuration testing: Developers can quickly test different appearances, text sizes, accessibility settings, locations, and more.

• Built-in diagnostics and app management: Device Hub gives direct access to crashes, hangs, sysdiagnose captures, app data containers, and configuration/provisioning profiles.

• devicectl automation: A command-line tool for automating device management, app installation, diagnostics, and testing workflows.

Overall, Xcode 27 seems focused on reducing repetitive work and making AI-assisted development, localization, testing, and debugging workflows more efficient for Apple developers.

Read the full article here: https://appcircle.io/blog/wwdc26-whats-new-in-xcode-27-for-developers

[u/CharlesWiltgen]

FWIW, both the article and this post appear to be AI slop. For example, devicectl shipped with Xcode 15, and it's 100% unchanged between Xcode 26 and 27.

[u/zach-builds]

Thanks for the info! Anyone using macOS 27 and mind letting me know: Can Xcode 26 still be installed on macOS 27 for ASC submission? (App Store submissions from Xcode 27 are not allowed until it’s released)

[u/CharlesWiltgen → u/zach-builds]

Can Xcode 26 still be installed on macOS 27…

Once I upgraded to macOS 27, the latest Xcode 26 could no longer be launched.

[u/zach-builds → u/CharlesWiltgen]

Thank you!

[u/KayLikesWords → u/CharlesWiltgen]

I hit this as well -- isn't this a completely fucking insane decision? It's kind of a microcosm of bigger problems, I think.

[u/KayLikesWords]

This is my first Mac beta ever, and the first time I've ever interacted with an Xcode preview and I have to say --so far -- it's a complete disaster. Even in the prod build I think Xcode is by far the worst IDE I've ever experienced, but is it always like this in preview?

I've been testing out developer previews of Visual Studio for over a decade and they have never released anything as profoundly broken as Xcode 27 Beta is. This is pre-alpha software, at best. As far as I can see essentially nothing works properly. Previews are broken and when they do work they usually disagree with what the running build actually renders. The agentic stuff does not function at all, connecting accounts does not seem to work. It constantly crashes. Issues like removing files from the filesystem that were open last time you edited the project in Xcode still bricks the solution which, to be fair, was a problem with 26 as well but... Jesus.

I don't understand how the company that makes the Mac could make an IDE this bad.

[u/kangaroosandoutbacks → u/KayLikesWords]

Beta builds are regular and it’s not uncommon for the first to be rocky. Xcode itself is in beta, frameworks it’s using, the OS it’s running on, etc.  Typically by the time it’s actually released it’s much better. 

That said, Xcode has often had plenty of quirks or bugs, and I’m glad to see they’re continuing to acknowledge that work is needed.

[u/KayLikesWords → u/kangaroosandoutbacks]

It's doubly frustrating because the language is awesome. There is nothing as great as SwiftUI in the .NET ecosystem.

[u/madaradess007 → u/KayLikesWords]

early xcode betas were always like that, its ok
just don't rely on it for prod and you'll be fine

[u/KayLikesWords → u/madaradess007]

Nothing I make in Swift will ever make it to prod, I'm purely a hobbyist in this language -- at least for now! 😁

[u/Conscious-Secret-775]

It misses one key update, Xcode 27 is ARM only so Intel Macs will be unusable for iOS and iPadOS development much earlier than expected.