Privacy notice.

Last updated 3 November 2026.

The short version

This website collects what you type into its email signup forms. It runs no advertising or analytics scripts and sets no cookies. It counts downloads and the app's update checks as one total a day, with nothing about who made them. We never sell or share what you give us.

Mosaik Cloud, coming soon, will keep your chats the same on every computer. This notice will say exactly what it keeps before it opens.

The Mosaik app keeps your chats and settings on your computer. It has no analytics and collects no usage statistics. The Mosaik app below lists everything that leaves your computer, and where it goes.

What we collect

When you sign up for emails we keep:

• your email address;
• your name and what you'd use Mosaik for, if you chose to tell us;
• which form you used and when you signed up.

Your IP address is used for a moment to stop one sender flooding the form, and is not kept with your signup.

After you sign up, we email you a link to confirm your address. You only join the list once you click it. If you never do, we send nothing more.

Why, and how long

We keep it because you asked us to, and you can change your mind at any time. We use your email to send you Mosaik news: big releases, new versions such as Linux and mobile, and Mosaics when it's ready. That's a few emails a year, and nothing else. We keep it until you unsubscribe or ask us to remove it.

If you joined before 1 October 2026, you signed up only to hear when Mosaics is out, so that's the only email we'll send you unless you sign up again for the wider list.

Where it is kept

The website is hosted on Cloudflare, and a copy of each signup is stored in a database in our Cloudflare account. Like any host, Cloudflare processes technical information such as IP addresses to deliver and protect the site.

The list itself is kept in Brevo, an email service, which holds your email address and first name, sends the confirmation email and our news emails, and records when you confirmed. Every email has a link to unsubscribe.

The signup forms use Cloudflare Turnstile to check that a visitor is a person and not a bot. It looks at technical signals from your browser, such as your IP address and how the page is used, only to make that check, and is not used for advertising.

Downloads

The installers are published on GitHub. When you download Mosaik, this site looks up the latest release and sends your browser to the file on GitHub, which serves it. GitHub sees that download as it sees any visit to its site, under its own privacy statement.

Each download adds one to that day's total of downloads. The total is all this site keeps: not your IP address, your browser or anything else about the visit. Link previews and search engine crawlers are left out of it.

Cookies and storage

The site sets no cookies. If you switch between light and dark, your choice is remembered in your own browser's local storage under mosaik-theme. It never leaves your device.

The Mosaik app

Mosaik runs on your computer, and what you do in it stays there unless it has to leave for the app to work.

• Your chats, settings, files and what Mosaik remembers about you stay on your computer, in a database in your user folder (%APPDATA%\Mosaik\Mosaik). We never receive them.
• Your OpenRouter key, when you sign in or choose to remember a key you pasted, is kept in the Windows credential store. It is never written to the database or the log, and is sent only to OpenRouter.
• No analytics. The app has no analytics, telemetry or usage statistics.

What leaves your computer, and where it goes:

• Your messages, with the files you attach and the conversation so far, go to OpenRouter and to the model provider you choose, under their own terms and privacy policies. The list of models is fetched from OpenRouter too. Settings › Privacy can limit your chats to providers that don't train on or store prompts, to those that keep nothing at all, and away from providers you name.
• Voice. Answers read aloud with your computer's voice stay on it; with a speech model, the answer's words go to that model.
• Ask from anywhere sends what you ask, with the text you had selected and any screenshot you added, to the model that answers. Nothing is captured until you open the window, and a screenshot only when you ask for one or turn that on.
• What Mosaik remembers about you (Settings › Memory) goes with each chat message to the model, as part of the conversation, and passages from your past chats go with it when the model looks them up. Settings › Memory turns either off, and a temporary chat uses neither.
• Imported chats. An export from ChatGPT or Claude is read on your computer. Nothing in it is sent anywhere.
• Notifications when a long answer is ready show the chat's name, and the start of the answer only if you turn that on. Windows keeps them in its notification list.
• Shared chats. Share as a page and Save as PDF write a file on your computer. Nothing is uploaded; who sees it is up to you.
• A file your model can't take, such as a picture sent to a model that can't see, goes through OpenRouter to the model that reads it first (Settings › Files names it, or turns this off). A picture you ask an image model to draw sends the model's description of it to that image model.
• Small requests of Mosaik's own go to your models through OpenRouter too, and count towards your spending: naming a new chat from its first message, judging how much reasoning a question needs when reasoning is on Auto, and now and then writing a personal greeting for the New Chat page from the titles of your recent chats. Personal greetings can be turned off where you choose the scene.
• Web searches go to the search services that answer them, and pages the app reads are fetched from their sites. A site cited in an answer is asked once for its icon. Search can be turned off in Settings › Web search.
• Live prices, rates and weather. A question about a share price, an exchange rate, a metal, a coin or the weather is answered from the services that publish those figures: Yahoo Finance for shares, funds, indexes and currencies; Frankfurter, the European Central Bank's reference rates, for other currencies; gold-api.com for metals; CoinGecko for coins; and Open-Meteo for the weather, or OpenStreetMap's Nominatim and MET Norway when Open-Meteo doesn't answer. Only the thing asked about is sent: the currencies, the company or fund, the metal, the coin or the place, never your question. Settings › Web search › Live prices, rates and weather turns this off.
• Pictures for an answer. When the AI looks for pictures to show, the words of that picture search go to Bing Images and Wikimedia Commons, and the pictures are fetched from the sites that have them. Settings › Web search › Pictures from the web in answers turns this off.
• A picture you ask about, when the answer means naming something in it (what it is, who made it, where it was taken), is sent to Yandex Images and TinEye to find the pages that show it. Settings › Web search › Search by picture turns this off.
• The update check asks this website for the latest version, sending only Mosaik's version and your Windows version, and new installers are downloaded from GitHub. Like any request to this site, it passes through Cloudflare. The site adds one to that day's total of update checks and keeps nothing else from the request. Settings › About and updates can make it ask first, or not look at all.
• A problem report, only when you choose to send one. It holds what you write, your email if you add it for a reply, your Mosaik and Windows versions and, if you leave it on, the end of Mosaik's log, with keys, tokens and your user folder's name taken out. Your chats are never included. You see exactly what will be sent before you press Send. Reports come to us through this website, are kept for six months, and are used only to fix problems and to answer you.
• Feedback or a feature suggestion, only when you choose to send it. It holds what you write, your email if you add it for a reply, and your Mosaik and Windows versions. It never includes Mosaik's log or your chats. It's kept for six months and used only to improve Mosaik and to answer you.

Your rights

You can ask to see, correct or delete what we hold about you at any time. Write to [email protected] from the address you signed up with.

Who we are

This website is run by the independent developer of Mosaik, based in Hungary, who is responsible for the email list data, problem reports and feedback described here. Write to [email protected] about anything in this notice.

If you think we have mishandled your data, you can also complain to the Hungarian National Authority for Data Protection and Freedom of Information (NAIH), or to the data protection authority where you live.