Gravity is live. The intelligence stays on the Mac.

Own your intelligence. Never rent it. Gravity is that sentence when the box is one Mac you already have.

Gravity is live. It is a private assistant that runs on the machine. The model downloads once, onto the Mac. After that, documents and conversations stay there. The only feature that uses the network is optional web search, and you turn it on yourself. The license is $99 for one year, for one Mac. There is no token meter and no account to rent the answers.

The same thesis

The Runtime home says AI was never meant to be rented. Gravity is the first thing you can buy that keeps the intelligence on hardware you own. You pay for the year, not for the prompt. The files you would not paste into a chatbot are the files Gravity is for.

What Gravity is not

• It is not the 14-day pilot. The pilot is for a fleet, a cabin, a rack, or silicon that is not a Mac — an iPad, a commodity GPU, Tenstorrent — with a written zero-egress bar before any annual node.
• It is not a rented API with a desktop window in front of it.
• It is not a retrieval layer. Older pages used the name Gravity for something else. The Mac app is the product.

How the edge showed up

We stopped asking whether people wanted private AI. We asked what they did the last time a file was too sensitive to paste into a chat. The document was already on a laptop. They closed the tab and read it themselves. That job fits a Mac they own. When the box is a cabin or a rack, the same engine is the Runtime pilot, not a second company.

Two doors

One Mac, today: get Gravity. A perimeter that is not one Mac: book the pilot, or pull the open-core image and evaluate the engine before you pay.

If you want to tell us the last file you would not paste, write to contact@zyrabit.com.