Apple's Claris is testing Harbor, a private AI server app for Macs

What Harbor does

Apple's subsidiary Claris is testing an app called Harbor that turns an Apple silicon Mac into a private AI server, according to MacRumors. The app runs open-weight models, meaning models whose files can be downloaded and used freely, directly on the Mac's own hardware.

Because everything runs locally, data processed by the models never leaves the machine and nothing is sent to the cloud. Harbor is described as an easy-to-use app that needs no manual configuration, no command line and no infrastructure expertise.

Clustering Macs over Thunderbolt 5

Harbor works with a single Apple silicon Mac, but it can also link several Macs over Thunderbolt 5 to pool their unified memory, the shared memory Apple silicon uses for both processing and graphics. This lets users run models that exceed the capacity of one computer, or serve more requests at the same time.

Apple added RDMA over Thunderbolt 5, a technique that lets computers exchange data directly across the cable at high speed, with macOS Tahoe 26.2, which makes the clustering faster. Harbor detects connected devices automatically, so users only need to plug in and start.

Model management inside the app

Harbor lets users browse for, download and load open-weight models from within the app itself. The software handles model management, so the setup process is described as taking minutes rather than hours.

The app is in early access and is not publicly available. MacRumors reports that an App Store listing existed but has since been removed.

A business focus and unclear plans

Claris is best known for FileMaker, its database platform aimed at businesses, so it is not clear how Apple plans to market Harbor or whether the app will be free. MacRumors notes that the sign-up page asks for a company name, which suggests a business orientation.

Free alternatives already exist for Mac users. Exo is an open-source tool for clustering Macs, and LM Studio serves people running models on a single machine. Harbor appears to combine LM Studio's simple interface with clustering, but Apple's intentions for the app remain unconfirmed.