This is a translation for information purposes. The German version is legally binding.

Terms of Use

for the app “Querno” · As of: 3. November 2026

1. Provider and scope

The provider of the app is VALNIO Solutions, Inhaber: Manuel Gjergjaj, Werastraße 36, 88045 Friedrichshafen (see Legal Notice). These terms apply to the use of the app “Querno” and the services connected with it. By installing and using the app, you agree to them. In addition, for downloads through the App Store, Apple’s license agreement applies.

2. What the app does and what it does not

Querno helps self-employed people to understand letters from the tax administration (Finanzverwaltung) and other bodies, keep track of deadlines, monitor turnover limits, ask general questions and prepare reply letters. Artificial intelligence is used in the process.

• No tax or legal advice. The app provides general information. It does not provide tax advice within the meaning of the German Tax Advisory Act (Steuerberatungsgesetz) or legal services within the meaning of the German Legal Services Act (Rechtsdienstleistungsgesetz). For your individual case, contact a tax advisor or the tax office (Finanzamt).
• AI can be wrong. Analyses, deadline calculations, answers and drafts may be incomplete or incorrect. Check every result against the original of the letter.
• Deadlines. The app calculates deadlines from the date of the letter according to the statutory rules (e.g. § 122, § 108, § 355 AO). The actual receipt and the content of the notice of remedies (Rechtsbehelfsbelehrung) are always decisive. Reminders are an aid, not a guarantee; they require that notifications are allowed on your device.
• Drafts and sending. Drafts of letters are templates. You check and complete them and send them on your own responsibility, even if you use the app’s email connector for this.

3. Plans, quotas and subscriptions

The Free plan includes a limited monthly quota of scans and questions. The Plus, Pro and Business plans are monthly subscriptions with a higher quota; the prices and quotas currently applicable are shown in the app and in the App Store. Quotas apply per calendar month, expire at the end of the month and are not transferable. The Business plan applies to one organisation (team) and is taken out by the owner of the organisation.

Subscriptions are billed through your Apple account and renew automatically for one month unless you cancel them in the settings of your Apple account at least 24 hours before the end of the period. A refund for periods already begun is governed by Apple’s terms.

4. Your obligations

• You use the app only for letters that are addressed to you or your business or for which you are authorised.
• You do not misuse the app, in particular not to deceive third parties, to write to authorities without authorisation or to circumvent the quotas.
• As the owner of an organisation, you are responsible for whom you invite and which data is shared in the team.
• With the email connector, you remain the sender of the emails; the app only sends what you expressly approve.

5. Availability and changes

We strive for high availability but cannot guarantee it; maintenance and disruptions at third-party providers (Apple, Supabase, Anthropic, Google, Microsoft) may restrict use. We may further develop the app, change features and adjust quotas or prices for future billing periods; we will inform you in the app about material changes.

6. Liability

We are liable without limitation for intent and gross negligence and for injury to life, body or health. In cases of simple negligence, we are liable only for breach of essential contractual obligations (obligations whose fulfilment is what makes the proper performance of the contract possible in the first place and on whose observance you may regularly rely), limited to the foreseeable damage typical for this type of contract. Liability under the Product Liability Act (Produkthaftungsgesetz) remains unaffected. In particular, we are not liable for disadvantages resulting from missed deadlines if the calculation is based on incomplete or incorrect input, an actual receipt that differs from the one assumed, or deactivated notifications, or for the consequences of decisions that you make solely on the basis of information from the app.

7. Term and termination

You can stop using the app at any time by deleting it; you cancel an ongoing subscription through your Apple account. We may block use in the event of serious violations of these terms. You delete locally stored data in the app; you delete your account with all server data (profile, letters, deadlines, team, email connection) in the settings under “Delete account”.

8. Final provisions

The law of the Federal Republic of Germany applies. If you are a consumer, the mandatory consumer protection provisions of the country in which you reside remain unaffected. Should any provision be invalid, the contract otherwise remains valid. We are neither willing nor obliged to participate in dispute resolution proceedings before a consumer arbitration board.