Terms of Service

Last updated: July 2026

§ 1 Scope

These General Terms and Conditions ("Terms") apply to the use of the web-based service DACHDENKER ("Service"). The provider of the Service is Felix Ziebell ("Provider"). The Service is aimed exclusively at entrepreneurs within the meaning of § 14 of the German Civil Code (in particular roofing companies and carpentries). By using the Service, the user accepts these Terms in their respective valid version.

Deviating, conflicting or supplementary terms and conditions of the user do not become part of the contract unless the Provider expressly agrees to their validity.

§ 2 Provider

§ 3 Description of services

DACHDENKER is a web-based SaaS service for AI-assisted visualisation of roof coverings on building photos. Users can upload images and have them edited by an AI model using configurable options. The AI processing is carried out via the Google Gemini API.

The Service is offered in various chargeable tariffs; the range of functions depends on the respective tariff. There is no claim to a specific range of functions or a specific quality of the AI results.

§ 4 Access and user account

Use of the Service requires a user account. Access is set up by the Provider after prior agreement; there is no open self-registration. The user is obliged to keep the data provided during setup truthful and up to date.

The password must be treated confidentially. If unauthorised access is suspected, the Provider must be informed immediately. The Provider reserves the right to block or delete accounts in the event of breaches of these Terms.

§ 5 Rights of use

The Provider grants the user, for the duration of the contract term, a simple, non-transferable right to use the Service for their own purposes.

• Uploaded images: The user retains all rights to the images they upload. By uploading, they grant the Provider the right required for technical processing.
• Result images: The user may use the result images generated by the Service for their own commercial and private purposes, in particular in quotes, consultations and their own advertising.
• Platform and software: All rights to the platform, the source code and the technologies used lie with the Provider or its licensors.

§ 6 User obligations

The user undertakes not to use the Service for the following purposes:

• Uploading content that violates applicable law (e.g. illegal, pornographic or violence-glorifying content)
• Infringement of copyright, trademark or other protective rights of third parties
• Uploading images of persons without the required consent of the person depicted
• Automated mass access without the express permission of the Provider
• Circumventing security mechanisms or access restrictions
• Passing on access data to third parties
• Distributing malware or harmful scripts

In the event of breaches, the Provider is entitled to block the user's access without prior notice and to assert claims for damages.

§ 7 Prices and payment

The current prices are shown on the website. All prices are subject to statutory VAT.

Invoicing is carried out directly by the Provider. Chargeable subscriptions are automatically renewed for the booked period unless they are cancelled in good time before expiry. Cancellation is possible at any time to the end of the current billing period.

If the user is not satisfied with the Service, they may request a refund of the fee paid within 30 days of the first payment.

§ 8 Availability of the service

The Provider endeavours to achieve the highest possible availability of the Service but does not guarantee uninterrupted accessibility. Maintenance work may cause temporary restrictions. The Provider is not liable for outages caused by circumstances outside its sphere of influence (force majeure, disruptions at the hosting provider, failure of the Google Gemini API).

§ 9 Limitation of liability

The Provider is liable without limitation only in the case of intent and gross negligence as well as for damage arising from injury to life, body or health.

Otherwise, the liability of the Provider is limited to the foreseeable, contract-typical damage at the time of conclusion of the contract. The Provider accepts no liability for:

• Quality or suitability of the results generated by the AI for specific purposes; visualisations are non-binding representations and do not replace professional planning or sampling
• Data losses caused by force majeure or external service providers
• Outages or errors of third-party services (in particular the Google Gemini API)
• Damage caused by misuse of the account by third parties, insofar as the user is at fault

§ 10 Term and cancellation

The usage contract is concluded for an indefinite period. Cancellation is possible to the end of the current billing period; a pro-rata refund of fees already paid is not made (without prejudice to § 7 sentence 4).

The Provider is entitled to discontinue the Service with a notice period of 30 days or to block or delete the user account without notice in the event of serious breaches of these Terms. If the account is deleted, all stored data is removed in accordance with the privacy policy.

§ 11 Changes to these terms of use

The Provider reserves the right to change these Terms with effect for the future. Changes will be communicated to the user by e-mail at least 4 weeks before they take effect. If the user does not object to the changes within this period, the new Terms are deemed accepted. This circumstance will be expressly pointed out in the notice of change.

§ 12 Final provisions

The law of the Federal Republic of Germany applies, excluding the UN Convention on Contracts for the International Sale of Goods (CISG). The exclusive place of jurisdiction for all disputes arising from this contract is the registered office of the Provider, insofar as the user is a merchant, a legal entity under public law or a special fund under public law.

The European Commission provides a platform for online dispute resolution: https://ec.europa.eu/consumers/odr. The Provider is neither willing nor obliged to participate in a dispute resolution procedure before a consumer arbitration board.

Should individual provisions of these Terms be or become invalid, the validity of the remaining provisions remains unaffected.