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Licence Terms (EULA)

End User Licence Agreement for Summa, Summa Pro and Summa AI.

Last updated: 28 September 2026

§ 1 Subject matter, provider

These licence terms govern the use of the app Summa and its add-ons "Summa Pro" and "Summa AI" (together the "App") between you and Oliver Sievers, Wittkopsweg 7a, 38518 Gifhorn, Germany, support@osiev.de (the "Provider"). The App is a tool for taking notes and working with numbers, formulas and evaluations.

§ 2 Purpose and limits

  1. Summa is a tool. Results shown are computer-assisted calculations based on your input.
  2. Whether a result is correct depends on whether the input and formulas are correct and complete.
  3. You check results yourself before relying on them, in particular before basing financial, tax, legal or contractual decisions on them. The App does not replace tax, financial, investment or legal advice.

§ 3 Summa AI

  1. Summa AI is an optional paid add-on service offered as a subscription. It creates and changes calculations in a note from a request in natural language and answers questions about a calculation.
  2. Summa AI uses a language model from Apple (Apple Intelligence on Private Cloud Compute). The Provider does not operate or train this model and has no influence on its answers.
  3. Answers from Summa AI are generated automatically. They can be wrong, incomplete or unsuitable for your purpose even when they look arithmetically consistent; in particular Summa AI may make assumptions, assign figures incorrectly or leave out circumstances that matter for your decision. The Provider does not check individual answers. Summa AI does not give advice.
  4. The properties described in para. 3 are part of the agreed nature of Summa AI. A result that is wrong or incomplete for these reasons is not a defect of the service.
  5. § 2 para. 3 applies to results from Summa AI without restriction. Lines created by Summa AI are ordinary calculation lines that you can view, change and delete.
  6. Summa AI requires a supported device with iOS/iPadOS 27 or macOS 27 and Apple Intelligence turned on. Scope and availability depend on Apple, among other things on a quota that Apple assigns to your Apple Account. The Provider cannot influence restrictions imposed by Apple.
  7. Purchase, term, renewal and cancellation of the subscription follow the information in the purchase dialog and the terms of the App Store; you cancel in your Apple Account.

§ 4 Licence

The Provider grants you a simple, non-transferable right to use the App on Apple devices that you own or control, within the usage rules of the App Store terms. "Summa Pro" is a one-time purchase with Family Sharing. "Summa AI" is a subscription without Family Sharing. Passing on, renting out or making the App available to third parties beyond this is not permitted.

§ 5 Technical requirements

The full range of functions requires a supported Apple device with a current operating system. Syncing between devices requires an active iCloud account and an internet connection.

§ 6 Liability

  1. In cases of simple negligence, the Provider is liable only for breach of an essential contractual obligation, the fulfilment of which makes the proper performance of the contract possible in the first place and on whose observance you may regularly rely; liability is then limited to the damage typical for the contract and foreseeable.
  2. Otherwise, liability is excluded. In particular, the Provider is not liable for damage resulting from you relying, contrary to § 2 para. 3, on a result you have not checked, including a result from Summa AI (§ 3).
  3. You back up your data yourself (iCloud, device backup, export). The Provider is liable for data loss under para. 1 only to the extent that the damage would also have occurred with proper backup.
  4. These limitations also apply in favour of the Provider's vicarious agents.
  5. Liability for intent and gross negligence, for injury to life, body or health, for fraudulently concealed defects, under an assumed guarantee and under the Product Liability Act, as well as mandatory statutory consumer rights, remain unaffected.

§ 7 Privacy

The privacy policy at https://osiev.de/en/summa/datenschutz.html applies. Summa has no user account and no servers operated by the Provider. With Summa AI, the request and the title and lines of the open note are sent to Apple; details are in the privacy policy.

§ 8 Changes

The Provider may adapt these terms for good reason (new functions, changed legal situation), provided this does not unreasonably disadvantage you. The current version is provided with the App.

§ 9 Terms in relation to Apple

  1. This agreement is concluded only between you and the Provider, not with Apple Inc. The Provider alone is responsible for the App and its content.
  2. The licence under § 4 is limited to use on Apple devices under the usage rules of the App Store terms.
  3. Maintenance and support are provided solely by the Provider (support@osiev.de). Apple has no obligation to provide them.
  4. To the extent a warranty exists and has not been effectively disclaimed, the Provider alone is responsible for it. If the App fails to conform to an applicable warranty, you may notify Apple, and Apple will refund the purchase price where applicable. To the maximum extent permitted by law, Apple has no other warranty obligation with respect to the App.
  5. The Provider, not Apple, is responsible for addressing any claims by you or third parties relating to the App (for example product liability claims, claims that the App fails to meet legal requirements, or claims under consumer protection or privacy law).
  6. If a third party claims that the App infringes its intellectual property rights, the Provider alone is responsible for investigating, defending and settling that claim.
  7. You represent that you are not located in a country subject to a US Government embargo or designated by the US Government as a "terrorist supporting" country, and that you are not listed on any US Government list of prohibited or restricted parties.
  8. When using the App, you comply with applicable third-party terms (for example Apple's terms for iCloud and Apple Intelligence).
  9. Apple and its subsidiaries are third-party beneficiaries of this agreement and may enforce it against you once you have accepted it.

§ 10 Final provisions

German law applies, excluding the UN Convention on Contracts for the International Sale of Goods; mandatory consumer protection provisions of your country of residence remain unaffected. If a provision is invalid, the remaining provisions remain valid.

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