What I keep, and what leaves your PC.

Last updated 8 November 2026

“My memory of us lives on your PC, not on anyone's server.” Here is exactly what that means.

Sebastian is made and sold by Leonard Haasbroek, Fargo, North Dakota, USA. Questions about privacy: support@meetsebastianai.com.

On your PC

Your conversations, his memory of you, your settings, your keys and the sound of your voice (which he uses to notice when someone else is in the room) are stored in his folder on your own computer. We never receive them. Uninstalling him without keeping his memory deletes them.

What leaves your PC, and why

• The brain you choose. To think, Sebastian sends what you're talking about (and the text of any file you show him) to the AI provider you picked in Settings, using your own key: for example Anthropic (Claude), Moonshot AI (Kimi, a company based in China) or OpenAI. That provider's own privacy terms apply. If you choose a local brain, this goes nowhere.
• Looking things up. When he researches, reads the news or checks the weather, he sends your search words to search, news and weather services (for example DuckDuckGo, news sites, GDELT, archive.org, Open-Meteo and the US Weather Service), and fetches the pages himself. In Tor mode this goes through the Tor network instead.
• Holograms. When you ask for a 3D model, he searches public model libraries (for example Sketchfab and NASA).
• Updates. He checks GitHub for new signed versions of himself. GitHub sees your internet address, as with any download.
• Your founder key. When Sebastian is installed, and at most once a day after that, he checks your key with Polar, our shop. He sends the key, a random activation number, and a one-way fingerprint of your PC that can't be turned back into anything about you. No PC name, no files, no conversations.
• Feedback and fault reports. If something breaks, or you'd like him to do something new, he can write a short report and send it to us at support@meetsebastianai.com. He shows you every word first, and it only goes if you say yes. It holds only those words, his version number and your Windows version: no files, no memories, no keys. From version 1.0.8 it goes straight to us through our own small Cloudflare forwarder, which emails it to our support inbox and keeps nothing; like any web service, Cloudflare sees your internet address as it passes through. In earlier versions, if the forwarder can't be reached, and always in Tor mode, it opens in your own email program instead, for you to send.
• Camera. This version of Sebastian doesn't use your camera at all. Pictures and screenshots are never sent to a cloud brain.

When you buy

Payment is handled by Polar, which sells Sebastian on our behalf as the merchant of record and handles tax and receipts. Polar collects your payment details; we never see your card. We receive your name, email address, country and order details from Polar so we can send your key, answer your questions and handle refunds. We don't sell or share them with anyone else, and we only email you about your purchase, your updates, or if you ask us something.

This website

This site uses no cookies, no analytics and no advertising trackers. It remembers two small things in your own browser only: the colour you picked for Sebastian, and whether you've already seen the opening. The site is hosted by GitHub Pages, and the 3D room loads a code library from cdnjs (Cloudflare). Like any website host, they see your internet address when the page loads.

Children

Sebastian is not made for children under 13, and we don't knowingly collect anything from them.

Your choices

You can delete everything on your PC by uninstalling Sebastian. To see or delete what we hold about your purchase, email support@meetsebastianai.com. Records Polar must keep for tax reasons stay with Polar.

If this page changes, the date at the top changes too.