Terms of use.

Last updated 2 October 2026.

The short version

Mosaik Chat is free, and nothing is for sale yet. The app is provided as is. It runs on your computer and sends your messages to OpenRouter using your own API key. You're responsible for that key, for how you use it, and for what OpenRouter charges you. If you use Mosaik as a consumer, you keep all the rights your local consumer law gives you. This summary doesn't replace the full terms below.

Who we are and what these terms cover

Mosaik is made by an independent developer based in Hungary (“we”, “us”). You can reach us at [email protected].

These terms cover the Mosaik desktop app (“the app”) and the website mosaikchat.com (“the website”). When you first open the app, we ask you to accept these terms. If you don't accept them, don't use the app.

The services the app connects to, such as OpenRouter, have their own requirements, including a minimum age. Meeting them is up to you (see “Other services” below).

Nothing is for sale yet

The app and the website are free. We don't sell anything at the moment: there are no paid features, subscriptions or in-app purchases, and we don't take payments of any kind. Your only costs come from the model provider you connect, such as OpenRouter, and they go to that provider, not to us.

Paid add-ons such as Mosaics are planned for the future but aren't on sale. The free chat app doesn't depend on them. Signing up for emails is free and doesn't commit you to buying anything. Before we sell anything, we'll publish the terms for it, and you'll see and accept them before you buy.

Using the app

You may install the app on computers you own or control, and use it for personal or work purposes. You may share the official, unmodified installer with others free of charge. You may not:

• sell, rent or charge for the app
• pass it off as your own, or remove our name or notices from it
• distribute modified copies of it

You can stop using the app at any time by uninstalling it. If you seriously break these terms, your right to use the app ends.

Your OpenRouter key and costs

The app reaches AI models through OpenRouter, using an API key from your own OpenRouter account. We never receive your key or your payments to OpenRouter.

• Keep your key safe. You're responsible for what is done with it, unless a fault in the app caused the problem.
• You're responsible for your usage and its cost. OpenRouter bills you directly, at its own prices. We recommend setting a credit limit on your key in your OpenRouter account.
• The app's figures are a guide. The costs and totals the app shows, and the spending limits you set in it, are there to help you keep track. They can differ from what OpenRouter charges, and OpenRouter's figures are the ones that count.

Other services

When you use the app, your messages go to OpenRouter and to the model provider you choose, and web searches go to the search services that handle them (such as public SearXNG servers, DuckDuckGo, Bing, Mojeek, Google News, Wikipedia, Stack Overflow, Hacker News, arXiv, Semantic Scholar, YouTube, and Parallel through OpenRouter). Those services' own terms and policies apply to that use, including OpenRouter's terms and the usage policies of the models you use. Following them, including any age requirement, is your own responsibility. We don't run or control those services and aren't responsible for them.

Your content and AI answers

We claim no rights in your prompts, your files or the answers you get. They go from your computer to the services above, never to us. What a model provider's terms say about them still applies.

AI answers can be wrong, out of date or incomplete. Check anything that matters before you rely on it, especially on health, legal, financial or safety questions.

Acceptable use

Don't use the app to break the law, to harm others or infringe their rights, or to get around the limits and rules of the services it connects to.

Updates and changes to the app

The app checks for updates and installs them automatically, unless you turn this off in Settings › About and updates. If you turn updates off, you may miss fixes, including security fixes.

Updates may change, add or remove features. We may also stop developing or offering the app; if we do, we'll say so on the website.

No warranty

The app and the website are free and provided “as is” and “as available”. Apart from the rights you have by law that can't be excluded, we make no promises or warranties about them. In particular, we don't promise that they will be free of errors, always available or suitable for a particular purpose, or that the app will never lose data. Keep copies of anything important.

Our liability

Nothing in these terms limits or excludes:

• our liability for harm we cause intentionally or through gross negligence
• our liability for death, personal injury or damage to health
• our liability under product liability law
• any other liability that the law doesn't allow to be limited, or your mandatory rights as a consumer

Apart from that, and to the extent the law allows, we are not liable for:

• indirect or consequential loss
• lost profits, revenue or business opportunities
• lost or corrupted data
• charges from OpenRouter or any other service, unless a fault in the app caused them

If you use the app for your business, our total liability to you in connection with the app and the website is limited to €100.

Changes to these terms

We may update these terms, for example when we add features, when paid features become available, or when the law changes. The date at the top shows when they last changed.

If a change affects you in a meaningful way, we'll tell you in the app at least 14 days before it takes effect, and mention it in the release notes. Changes the law requires may take effect sooner. If you don't agree with a change, you can stop using the app. If you keep using it after the change takes effect, the new terms apply to you.

Transferring these terms

We may transfer our rights and obligations under these terms to a business we set up to run Mosaik, or to whoever takes over the app, as long as this doesn't reduce your rights. We'll tell you if we do, and you can stop using the app if you don't want to continue.

General

• If a court finds part of these terms invalid, the rest still applies.
• If we don't enforce part of these terms straight away, we can still enforce it later.

Law, courts and complaints

These terms are governed by Hungarian law. If you use the app as a consumer, you keep the protection of the mandatory laws of the country where you live, and you can bring a claim in the courts of that country or in Hungary. If you use the app for your business, the competent court in Hungary has exclusive jurisdiction.

If you have a complaint, please contact us first at [email protected], and we'll try to sort it out with you.

Contact

Questions about these terms: [email protected]. How we handle personal data is explained in the privacy notice.