Privacy Policy

What Cerno is

Cerno reads the last 90 days of your Chrome history through a Chrome extension and writes a profile of you from it. This page explains what that involves and what happens to your data. The Terms of Service cover the rest.

Signing in with Google

Cerno asks Google for your basic profile only: OpenID, your email address and your name. Cerno stores your Google account ID, email address and name. It does not get access to Gmail, Drive or any other Google data, and it never sees your Google password.

Your browsing history

The extension reads page addresses, page titles and visit times from the last 90 days, in the Chrome profile where it is installed. It does not read page contents, and it does not read Incognito windows. It only acts when you start it from the Cerno site, and it sends your history once per request.

Visits to a list of sensitive sites and topics (adult, health, dating, job hunting, gambling and similar) are dropped in your browser, before anything is sent. The list cannot catch everything.

What happens on the server

Cerno’s server strips IDs, account numbers and email addresses from what arrives, then condenses the visits into a digest. The raw list of visits is deleted from the database once the digest has been built.

Cerno keeps the digest, the working notes made from it, and the finished profile, so that you can read your profile. It also keeps basic facts about each run: when it started and finished, which model wrote it, token counts, and the error text if it failed.

AI model providers

The digest is sent to an AI model provider, which writes the profile. Depending on how the service is configured at the time, it is sent through the API of Anthropic, Google (Gemini), OpenAI or SpaceX (Grok).

Who can see your profile

Only you can read your profile, when you are signed in. The people who run Cerno can access the database in order to operate and fix the service.

The profile may state sensitive things plainly when the evidence for them is there.

Cookies and storage

Cerno sets one cookie: a signed session cookie that keeps you signed in for up to 14 days. There are no advertising or analytics cookies and no third-party trackers. The extension stores a small amount of its own state in Chrome’s extension storage.

Sharing

Cerno does not sell your data. It does not share it with anyone except the AI model provider described above, or where the law requires it.

Keeping and deleting your data

Your account, digest and profile are kept until you ask for them to be deleted. There is no delete button yet. Email hello@cerno.si from the address you signed in with, and we will delete your account and everything stored with it.

You can remove the extension from Chrome at any time, and you can revoke Cerno’s access in your Google account settings.

Security

Connections to Cerno use HTTPS. No service can promise perfect security, and Cerno cannot either.

Age

You must be 18 or older to use Cerno.

Changes to this policy

Cerno is new and will change. If a change affects what data we collect, how we collect it, what we use it for, or who can see it, we will explain it on the site or in the extension and ask you before it applies to you.

When this policy changes, the date at the top changes.

Contact

Questions about this policy or your data: hello@cerno.si.