Claris, the Apple subsidiary best known for FileMaker, is signing up testers for a Mac app called Harbor that turns Apple silicon computers into a private AI inference server with no cloud connection.
The sign-up page for Claris Harbor describes an early access program in which a single Mac can host open-weight models, and several machines can be linked over Thunderbolt 5 to pool their unified memory. The company says the setup carries "zero cloud fees" and "no per-token billing", and that prompts and data stay on the user's own hardware.
Evidence of the app surfaced on November 10, in a post published by Aaron (@aaronp613) on X, embedded below, which carried screenshots and marketing copy for Harbor. MacRumors reported that the app had appeared in an App Store listing that has since been removed, and that it is not yet publicly available. 9to5Mac and AppleInsider covered the discovery the same day.
According to the copy Perris published, Harbor detects connected machines automatically and forms a cluster without command-line work: "Plug in, start, and you're running." The app also handles browsing, downloading and loading models from inside its own interface.
Clustering depends on Thunderbolt 5 links between Macs. MacRumors noted that Apple added RDMA over Thunderbolt 5 in macOS Tahoe 26.2, a change that speeds up communication between machines in a cluster. 9to5Mac reported that the Mac has grown more popular this year as a machine for running AI models locally, naming the Mac Studio and Mac mini in particular.
The Claris form asks prospective testers for a company name, which MacRumors said points to a business focus. Claris has not said what Harbor will cost or when it will be released. Mac users who want a local server already have free choices: LM Studio runs models on one machine, while the open-source project Exo links several Macs together, MacRumors reported.