'Marble' Project Actually Xcode 4?

093707 xcode banner

In January 2009, both MacRumors and Daring Fireball's John Gruber began hearing rumors that Apple was working on a project code-named "Marble" that was believed to be an overhaul of the Mac OS X interface set to appear with Snow Leopard later that year.

As time went by, however, Gruber noted that "Marble" was unlikely to appear in Mac OS X Snow Leopard, and indeed the new operating system did not carry the significant overhaul many had been hoping for, leading to speculation that it could still appear in Mac OS X 10.7 whenever that sees the light of day.

Yesterday, Gruber revealed that "Marble" actually appears not to be a Mac OS X interface revamp but an overhaul of Xcode, Apple's developer tools for Mac OS X and iOS. A beta version of Xcode 4 was previewed at Apple's Worldwide Developer Conference earlier this month, but with the sessions covered by non-disclosure agreements, it was taken some time for details on the update to come out. One of the major changes in Xcode 4 is the integration of Interface Builder into the larger Xcode application, creating a unified interface that comprises the "Marble" project.

Xcode 4 is still in beta, Apple doesn't have screenshots available, and what was shown at WWDC 2010 is covered by NDA. But if you have a developer account, you can get a tour of the new interface by watching the Developer Tools State of the Union session. It is, to say the least, a major overhaul - primarily focused on doing more within a single window, even going so far as to bake Interface Builder into Xcode itself. According to several informed sources at WWDC, that's the "Marble" project.

It is unknown when Xcode 4 will make its official debut, but it appears to promise a significantly enhanced development environment for creating and testing applications.

Popular Stories

Low Cost MacBook Feature A18 Pro

Apple Is Expected to Launch These Four MacBooks in 2026

Friday January 9, 2026 8:17 am PST by
2026 could be a bumper year for Apple's Mac lineup, with the company expected to announce as many as four separate MacBook launches. Rumors suggest Apple will court both ends of the consumer spectrum, with more affordable options for students and feature-rich premium lines for users that seek the highest specifications from a laptop. Subscribe to the MacRumors YouTube channel for more videos. ...
iPhone Top Left Hole Punch Face ID Feature Purple

10 Reasons to Wait for This Year's iPhone 18 Pro

Thursday January 8, 2026 2:56 am PST by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...
iOS 18 Siri Personal Context

Apple Confirms Google Gemini Will Power Next-Generation Siri This Year

Monday January 12, 2026 7:38 am PST by
In a statement shared with CNBC today, Apple confirmed that Google Gemini will power the next-generation version of Siri that is slated to launch later this year. "After careful evaluation, we determined that Google's technology provides the most capable foundation for Apple Foundation Models and we're excited about the innovative new experiences it will unlock for our users," the statement...
iOS 18 Siri Personal Context

Elon Musk Reacts to Apple and Google Teaming on Gemini-Powered Siri

Monday January 12, 2026 11:38 am PST by
Elon Musk today expressed concern about Apple and Google partnering on a more personalized version of Siri powered by Google's generative AI platform Gemini. "This seems like an unreasonable concentration of power for Google, given that [they] also have Android and Chrome," wrote Musk, in a post on X. Musk serves as CEO of xAI, the company behind Gemini competitor Grok. It is unlikely...
iOS 26

Here's What's New in iOS 26.3 So Far

Monday January 12, 2026 1:15 pm PST by
Apple today seeded the second beta of iOS 26.3, nearly a month after the first beta. So far, the update includes a couple of new features for iPhones. iOS 15.3 through iOS 18.3 were all released in late January over the years, so it is thereby likely that iOS 26.3 will be released towards the end of this month as well. The update is compatible with the iPhone 11 series and newer. Below,...
Apple Intelligence iPhone 16

Google Gemini Partnership With Apple Will Go Beyond Siri Revamp

Monday January 12, 2026 8:48 am PST by
Apple and Google today announced that Google Gemini will help power not only a more personalized version of Siri, but a range of future Apple Intelligence features. "Apple and Google have entered into a multi-year collaboration under which the next generation of Apple Foundation Models will be based on Google's Gemini models and cloud technology," the companies said, in a statement. "These...
proposed unicode emoji 18%402x

Squinting Face, Pickle, and Lighthouse Among New Emoji Coming to iOS

Friday January 9, 2026 4:24 am PST by
The Unicode Consortium has published a draft list of emoji that could come to smartphones and other devices in the future. The list shared by Emojipedia outlines 19 emoji candidates under consideration for Emoji 18.0, which is expected to be finalized in September 2026. Among the proposed additions are a squinting face emoji, left- and right-pointing thumb gestures, a pickle, a lighthouse, a ...
iOS 26

iOS 26.2.1 Update Coming Soon for iPhones

Monday January 12, 2026 8:19 am PST by
iOS 26.3 will likely be released to the public later this month, but it appears that Apple is preparing to push out another software update in the interim. Apple's software engineers have started testing iOS 26.2.1, according to the MacRumors visitor logs, which have been a reliable indicator of upcoming iOS versions. The update will likely be released at some point this week or next week. ...