Privacy

What Vesper keeps on your computer, what leaves it, and who sees it.

Last updated 12 November 2026

The short version

• Your browsing stays on your computer. Vesper has no analytics, no tracking and no advertising.
• An account is optional. It is needed only for Sync and for asking Vesper.
• Synced tabs are encrypted on your computer with a passphrase only you know. We cannot read them.
• When you ask Vesper a question, the question and what you chose to show it are sent to be answered.

What stays on your computer

History, open tabs, saved passwords, cookies and site data, downloads, settings and your spaces are stored on your computer and are not sent to us. Saved passwords are encrypted with your operating system's own protection (the Keychain on a Mac, Windows data protection on a PC).

What leaves your computer when you browse

• The sites you visit receive what any browser sends them.
• Your search engine receives what you type in the command bar when search suggestions are shown, and your searches. You choose the engine in Settings.
• Blocking lists for the built-in ad and tracker blocker are downloaded from their publisher.

Your account

If you create an account we store your email address and how you signed in. If you sign in with Google, Google tells us your email address, your name and your profile picture; we use them only to create and show your account. We do not receive your Google password, and we do not read your Google data.

Accounts are stored with Supabase, in the European Union.

Sync

Sync keeps your spaces, folders, tabs and favorites the same on your computers. Before anything is sent, it is encrypted on your computer with a key made from your sync passphrase. The passphrase never leaves your computer, so what the server holds cannot be read by us or by anyone who gets hold of it. Passwords, history, site data and settings are not synced.

Asking Vesper

When you ask Vesper a question, your question is sent to our answer service. In the side panel, a picture and the text of the page you are looking at are sent with it, unless you cover the page; if you choose "All tabs", the names and addresses of your open tabs and some of their text are sent too. Vesper shows you what it is looking at before you ask.

The answer service passes this to the AI model that writes the answer (currently OpenAI) and may search the web for you. Our service does not keep your questions or the pages you shared after the answer is written, and we do not use them for advertising. OpenAI handles what it receives under its own policy. The conversation itself is kept on your computer.

Payments

Vesper Plus is sold by Paddle, who acts as the reseller. Paddle collects your payment details and handles the payment; we never see your card. Paddle tells us that a subscription started, renewed or ended, and the email address it belongs to.

Who else is involved

• Supabase: accounts and encrypted sync data.
• Railway: hosting for the answer service.
• OpenAI: the AI model that writes answers.
• Paddle: payments for Vesper Plus.
• Vercel: this website and the download.

We do not sell your data and we do not share it with anyone else.

Your choices

You can use Vesper without an account. You can sign out at any time, turn Sync off, and clear your browsing data in Settings. To have your account and its synced data deleted, write to us from the account's email address.

Children

Vesper accounts are not meant for children under 13.

Changes and contact

If this page changes in a way that matters, the date above changes and signed-in users are told. Questions: jayden.devbox@gmail.com.