Terms of Service

The Service is provided by Lukas Buck, Dorfstraße 11, 72660 Beuren, Germany ("we"). Contact: hello@sixsentences.com.

SixSentences_ runs systematic literature searches: it compiles search protocols, queries scholarly indexes and the open web, screens the records it finds against the protocol, ranks the result, retrieves openly available full texts and produces a documented report. It also answers research questions with an assistant that cites its sources. The scope of the Service is what the application offers at the time of use.

The Service is in an early access phase. Access is granted by invitation, features may change, be added or removed, and availability is not guaranteed. We announce material changes in the app where reasonably possible. Export functions for your content are part of the product precisely so that you never depend on our availability.

You must provide accurate information when registering and keep your credentials confidential. Accounts are personal; workspaces may be shared with team members through the features the app provides. You must be at least 16 years old. You are responsible for activity under your account unless it results from a breach on our side.

Usage is metered in credits as described on the pricing page. A quick answer costs 1 credit, a systematic search costs 30 plus 1 per 20 records screened; the exact price list in the app applies. Credit budgets refresh monthly and unused credits do not carry over. During early access, plans are assigned by us free of charge and no payments are processed. Paid subscriptions, if and when they launch, will be announced in advance together with order and withdrawal terms; nothing in these terms obliges you to pay anything today.

You agree not to:

• break the law, infringe intellectual property or violate the rights of third parties when using the Service,
• enter special categories of personal data (Art. 9 GDPR) or other people's personal data into research questions, uploads or chats; the Service is for searching scholarly literature and does not need such data,
• upload documents you are not permitted to process, or use the Service to circumvent publishers' access controls; full texts are retrieved only where openly available,
• probe, overload or disrupt the Service, circumvent rate limits or usage metering, or access other workspaces,
• resell or white-label the Service without our written agreement, or
• use automated access other than through the documented API with your own API key.

Security research is welcome within responsible disclosure: report findings to hello@sixsentences.com and give us reasonable time to fix them before publication.

Questions, protocols, uploads, decisions, notes and exports remain yours. You grant us the non-exclusive right to process this content solely to operate the Service for you; this right ends when you delete the content or the account. We do not use your content to train models and we do not claim ownership of research output you create with the Service.

The Service, its software, design, brand and documentation remain our property or that of our licensors. Bibliographic metadata and full texts originate from their respective rights holders and open indexes; their licenses are unaffected by these terms.

Screening decisions, rankings, summaries and answers are produced by machine processing, including large language models. They are grounded in retrieved sources and documented, but they can be incomplete or wrong. The Service is a research tool, not a substitute for scientific judgement: verify results before you rely on or cite them. Responsibility for work you publish stays with you.

We operate the Service with reasonable care but promise no specific availability during early access. Maintenance, upstream providers and force majeure can interrupt the Service. Your statutory rights remain unaffected.

You can stop using the Service and delete your account at any time in the settings; deletion is permanent. We may suspend or terminate accounts that violate these terms, after warning where reasonable. If we discontinue the Service as a whole we will announce it at least 30 days in advance so you can export your content.

We are liable without limitation for intent and gross negligence, for injury to life, body or health, under the German Product Liability Act and wherever liability cannot be limited by law.

For services provided free of charge, our liability is otherwise limited to intent and gross negligence. For paid services, we are additionally liable for the negligent breach of essential contractual obligations, meaning obligations whose fulfilment makes the proper performance of the contract possible in the first place and on whose observance you may regularly rely; in that case liability is limited to the foreseeable damage typical for this kind of contract. Any further liability is excluded.

We may amend these terms with effect for the future, for example when features or the legal situation change. We announce amendments in the app or by email at least 14 days before they take effect. If you do not agree, you can end the use of the Service; continued use after the effective date constitutes acceptance. Material changes that would disadvantage you significantly will be put to you for active consent.

German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer, the mandatory consumer protection rules of your country of habitual residence remain unaffected, and the statutory venues apply. If you are a merchant, the place of jurisdiction is our seat. Should individual provisions of these terms be invalid, the remainder stays in force; the invalid provision is replaced by the statutory rule.