Vesper is a small, experimental AI chat site that Eyad runs on his own home computer. This page explains, in plain words, what it keeps about you and what it doesn't.
Your chats
Your conversations are saved in your own browser, not on the server. Clearing your browser data deletes them. You can export or delete them in Settings.
When you send a message, the server reads it to write a reply and then forgets it. It does not keep logs of what you write.
👍 / 👎 ratings are saved in your browser with the chat.
Moving to vesper-chat.com (October 31, 2026): if you open the old address (vesper.zapus-ayu.ts.net), your browser locks your saved chats and settings with a one-time key and hands them to vesper-chat.com. The server only holds the locked copy for up to 15 minutes, for one pickup. The key stays in your browser's link and is never sent to the server, so the server can't read your chats.
Time zone and location: with each message, your browser sends its time zone (like "America/New_York") so newer models know the date, time and rough region. If you typed a location in Settings (like "New Jersey"), that is sent too. Both are only used to write that reply and are not saved. You can turn off the time zone and clear the location in Settings. The site never uses GPS or your exact location.
What the server keeps
If you sign in with Google: your email address, name and a link to your profile picture, so the site knows who you are. A sign-in lasts 30 days.
If you don't sign in: your browser makes a random ID. The server only stores a scrambled (hashed) version of it.
Usage counts: how many words (tokens) you have used and how many messages you have sent, with times, to apply usage limits.
Memory (Settings → Memory): short facts you ask Vesper to remember, by saying "remember that …" or adding them yourself. They are saved on the server with your account (or your browser's scrambled ID if you don't sign in), so they work on every device you sign in on, and they are added to each reply so the model knows them. You can see and delete each one, or forget everything, in Settings → Memory, and you can turn memory off there (then nothing new is saved and nothing saved is used). Up to 30 facts, 200 characters each.
Redeem codes: which plan a code gave you. The codes themselves are only stored scrambled.
To stop abuse, the site briefly remembers your internet address in memory (for a few minutes). It is not saved to disk.
Ratings, while "Help improve Vesper" is on (Settings; it is on unless you turn it off, and the first rating tells you): when you tap 👍 or 👎, that reply and up to seven messages before it are saved, with the model's name and a scrambled ID instead of your account. Attached files are saved by name only, not their contents. Eyad uses them to make better practice data for future models. Turn the switch off and nothing more is sent. Replies you don't rate are never sent.
Other services involved
Tailscale (and Cloudflare, for the older temporary links) connects this site to the internet, so your requests pass through their network on the way to the computer that runs Vesper.
Wikipedia: for factual questions, the site may look up a topic from your message on Wikipedia (for example "Egypt"). Wikipedia sees that search coming from this site, not from you.
Google: only if you choose "Sign in with Google". The page also loads its fonts from Google Fonts, which means Google can see your internet address when the page loads.
Code in Vesper's replies may be run in a locked-down sandbox on the same computer to check that it works. It has no internet and no access to anyone's files.
Deep search (in the + menu): the site runs a few Wikipedia searches based on your message. Wikipedia sees those searches coming from this site, not from you.
Rough location: if you haven't set a location, the site asks ip-api.com which town your internet address is in (often a nearby town), so newer models know roughly where you are. It is kept in memory for a day, not saved.
"Use my city" (Settings, only when you press it): your browser asks your permission, then sends your rough coordinates to BigDataCloud to look up your town's name. Only the town name is kept, in your browser.
Open-Meteo: when you ask about the weather, the site sends only the place name (for example "Chicago") to Open-Meteo to get the forecast.
Visitor counts
To see how many people use Vesper, the site keeps daily totals: page views per page, how many different visitors, how many messages, which models were used, and which website linked you here (only its name, like reddit.com).
To count each visitor once per day, the site mixes your internet address and browser type with a random value that changes every day, and keeps only the scrambled result. It can't be turned back into your address, it can't link you from one day to the next, and it is deleted the next day. Only the totals are kept.
A visit only counts when the page's own script tells the site a person seems to be there: you moved, scrolled, tapped or typed, or the page stayed open 3 seconds. That ping carries the page's address, the site that linked you, and whether your browser says it is being remote-controlled. Nothing else.
To leave bots out, your internet address is checked against the public lists of cloud server networks (like Amazon's and Google's). The address is only looked up, never saved.
No cookies for visitors, no chat text, no addresses, no outside analytics company. Only Vesper's owner can see the totals (the owner's own browser keeps one cookie so their visits aren't counted).
Vesper Check
Before a free API key is made, the site asks you to click an "I'm human" box. Your browser then solves a small math puzzle (about a second of work), and the site checks the answer, that the click was a real click, that your browser isn't remote-controlled, and that you aren't on a cloud server network.
Vesper Check is built into Vesper; no outside company is involved. Nothing about you is saved: the puzzle and its one-time pass expire within minutes.
Vesper Code
Python in Vesper Code runs inside your own browser. Your code and its output are not sent to the Vesper server.
If you open a folder, Vesper Code can only see that one folder, and only after your browser asks you. Files stay on your computer. Files you make without opening a folder are saved in your browser.
To work, it loads its code editor and Python (Pyodide) from jsDelivr, a public code service. Like any website you load files from, it can see your internet address.
What Vesper doesn't do
No ads, no selling or sharing your information, no tracking across other websites.
Your chats are not used to train the AI. (They never reach the server's storage in the first place.) The one exception is replies you rate yourself while "Help improve Vesper" is on.
A small safety check reads each message before the model does. For messages about hurting yourself it shows crisis helplines instead of a generated reply, and it refuses requests about sexual content involving minors or making weapons, poisons or drugs. Nothing about this is saved.
Your choices
You can use Vesper without signing in.
To have your stored account information (email, usage counts, plan) deleted, ask Eyad.
Children
Vesper is not designed for children under 13. It is a small model that can make mistakes or say odd things.
This is a hobby project, written to be honest and simple rather than by a lawyer.