Sistine builds AI products.

Two apps for your Mac, both ready today.

SistineGPTAvailable A private alternative to ChatGPT that runs on your Mac. Free with a model on your own Mac · $19 a month for Private Cloud Download SistineGPT How it works → 9.7 MB, then a one-time model download of 2 to 9 GB · macOS 14 or later · Apple silicon (M1 or newer) · No account · Notarized by Apple

SistineGPT is a Mac app. Send yourself the link, then open it on your Mac.
Email this link to yourself
Your mail app opens with the link in it; add your own address. It needs a Mac with macOS 14 or later and Apple silicon.

Tightening a notice with GPT-OSS, a free model running on this Mac. The one-click setup picks a model sized to yours.
Chat the way you already do, in one ordinary Mac window. With the free model on your Mac, a chat never reaches our servers, and every chat you keep is encrypted on your Mac. When you want a bigger model, the Private Cloud plan adds one in the cloud, sealed end to end. The Ghost button makes any chat one that is written to no file.
Sistine PathAvailable A clearer view of market history, for your Mac. $9 a month · US customers only Download Sistine Path Read more → 12.7 MB · macOS 14 or later · Apple silicon · Notarized by Apple · A subscription is required to use it

Sistine Path is a Mac app. Send yourself the link, then open it on your Mac.
Email this link to yourself
Your mail app opens with the link in it; add your own address. A $9 a month subscription is required to use it, US customers only.

Past patterns and what followed them, not a forecast or a promise.
Market research for your Mac. Compare an asset with its five closest matches in market history and see the paths that followed, find the unusually quiet periods in an asset's own record, and screen relative strength from daily moves out to six-month trends, across stocks, indexes, crypto and commodities.

A private alternative to ChatGPT, on your Mac.

Ask, rewrite, plan and think out loud the way you already do. What changes is where the answer is made.

Free, with a model on your Mac

One click sets up a free model sized to your Mac, a one-time download of 2 to 9 GB. A chat with it never reaches our servers, needs no account, and once the model is set up it works with no internet connection.

Private Cloud, $19 a month

A bigger model in the cloud, for long writing and the hard questions your Mac's model gets wrong. Your Mac locks each message so only the sealed server can open it. You buy it inside the app when you want it, and the free app stays free.

Ghost mode

Like a browser's private window. A Ghost chat is written to no file on your Mac and reads no memory notes. Close it and it is gone, unless you choose to keep it.

Download SistineGPT Pricing and questions →

Things you can check yourself

Signed and notarizedBoth apps are signed with our Apple Developer ID and notarized by Apple, and your Mac checks that before it opens them.
No account to startSistineGPT asks for no email and no sign-up to chat with the model on your Mac.
Works offlineOnce the model on your Mac is set up, SistineGPT chats with no internet connection at all.
Claims you can testThe Proof page sorts every privacy claim into what you can check and what rests on our word, and the privacy policy names every company involved.

Download

Both apps need macOS 14 or later on a Mac with Apple silicon (M1 or newer).

SistineGPTFree with a model on your own Mac. SistineGPT-1.2.0.dmg, 9.7 MB, then a one-time model download of 2 to 9 GB. Download
Email this link to yourself
Sistine Path$9 a month, US customers only, and a paid subscription is required to use the app. SistinePath-1.16.4-macOS.zip, 12.7 MB. Download
Email this link to yourself

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