Terms of Use

Last updated: 1 August 2026

These terms cover the Zeig app and the receiver page at zeig.franzai.com. They are short because Zeig is small: it is free, there is no account, and the thing you actually care about — your file — never passes through us.

Who you are dealing with

Franz Enzenhofer – FullStackOptimization, sole proprietor (Einzelunternehmer), Fröbelgasse 62/8-9, 1160 Vienna, Austria. Full details are in the Impressum. That email address is also the single point of contact for users and for authorities.

What Zeig does

You show a QR code, someone points their camera at it, and the file goes from your device to theirs. The two devices connect directly and encrypt the file end to end. All we operate is a small relay that lets the two devices find each other: it carries the connection handshake and nothing else, and it keeps nothing. We cannot see, store, recover or hand over what you send.

What Zeig is not

• It is not storage. Nothing is buffered for later pick-up.
• It is not a delivery guarantee. If nobody scans the code, or the two networks cannot reach each other, the transfer simply fails.
• It is not a backup. Keep your own copy of anything that matters.

Using it

Zeig is free and meant for ordinary, personal use. You are responsible for what you send and for what you accept. In particular:

• Send only what you are allowed to send — nothing unlawful, nothing that infringes someone else's rights, nothing that harms the person receiving it.
• Do not use the relay to attack, flood or degrade the service, and do not try to interfere with other people's pairings.
• You need to be old enough to agree to these terms where you live, or have your parents' consent.

There is no account to close. If the relay is being abused we can block access to it — that is the only lever we have, and the only sanction there is.

We do not monitor, and we cannot

The relay transmits what the two devices send each other without selecting, changing or storing it. That makes it a mere conduit under §§ 13 and 18 of the Austrian E-Commerce Act (ECG) and Article 4 of the EU Digital Services Act: we are not liable for transmitted content and we have no obligation to monitor it. We also have no ability to. If a court or authority orders us to act, the only thing we can do is cut off the relay; there is no content to remove and no record to produce.

Beta, and what we promise

Zeig is in beta and is provided free of charge, as it is. We do not promise that it will be available, that a given transfer will succeed, or that it is free of faults. What we do promise is that we will not quietly do something other than what is described here and in the Privacy Statement.

Nothing in these terms limits your mandatory rights. If you are a consumer, statutory warranty rights (Gewährleistung) and consumer protection law under Austrian and EU law apply to the extent the law says they do, and we do not exclude or shorten them.

Liability

We are liable without limit for injury to life, body or health, for damage we cause intentionally or through gross negligence, and wherever mandatory law — including the Austrian Product Liability Act (Produkthaftungsgesetz) — provides for liability. For slight negligence we are not liable, as far as the law permits for a service that is free of charge. We are not liable for what other people send you or for what you do with a file you received.

The app comes through Apple

The iOS app is distributed by Apple through TestFlight and the App Store, and Apple's own terms apply to that distribution. Apple is not a party to these terms, gives no warranty for Zeig and is not responsible for it; Apple and its subsidiaries are third-party beneficiaries of these terms and may enforce them.

Changes

We may change these terms — for a new feature, or because the law changes. The current version always lives at this address with its date at the top. If a change materially affects you, we will say so on the page before it takes effect. Continuing to use Zeig after that means the new version applies.

Law, and where to complain

Austrian law applies, excluding its conflict-of-law rules and the UN Convention on Contracts for the International Sale of Goods. If you are a consumer, this choice does not deprive you of the protection of the mandatory rules of the country you live in (Art 6 Rome I), and you can bring a case in the courts of your place of residence.

The European Commission's online dispute resolution platform was shut down on 20 July 2025, so there is no EU form to link to any more. In Austria you can turn to the Internet Ombudsstelle (ombudsstelle.at) or to the Schlichtung für Verbrauchergeschäfte (verbraucherschlichtung.at). We are not obliged to take part in such a procedure and have not committed to one — but write to us first, and you will get an answer.

Contact

Franz Enzenhofer · team@fullstackoptimization.com