Last updated: September 2026
1. Provider, subject matter and scope
1.1 These terms and conditions (the "Terms") govern the contractual relationship between Systeme Digital GmbH, Wandlhamerstraße 34a, 82166 Gräfelfing, Germany, represented by its managing directors Jakob Thiele and Staffan Schilke, registered with the commercial register of the Munich Local Court under HRB 291589 (the "Provider" or "we"), and you as a user of the Zeno study application ("Zeno" or "the application").
1.2 Zeno is a web application that runs in the browser. It provides AI-assisted study support: explanations and homework help in a chat, summaries and study sheets, flashcards with a review mode, quizzes and tests, and the revision of your own texts.
1.3 What we owe you is the technical provision of these features. No particular learning outcome, improvement in grades, or exam result is owed or promised.
1.4 These Terms apply in the version in force when the contract is concluded. We do not accept differing terms of yours unless we have expressly agreed to them in writing.
1.5 A consumer is any natural person who enters into the contract for purposes that are predominantly outside their trade, business or profession.
2. Conclusion of contract and account
2.1 Using Zeno requires an account. On completing registration, a free contract of use for the free features comes into effect.
2.2 A paid subscription comes into effect when you press the button confirming a payment obligation in the ordering process and we confirm the order or begin performance. Immediately before you order, we show you the total price including VAT, the term, how it renews, and the cancellation terms.
2.3 We do not separately store the text of the contract. You can retrieve and save these Terms from this page at any time. We send your order details to you by e-mail.
2.4 The contract is concluded in German or in English, depending on the language of the page on which you conclude it. Where the two language versions of these Terms conflict, the German version prevails for consumers habitually resident in Germany, and the English version prevails otherwise.
2.5 You may create only one account, for yourself, and the details you give must be accurate.
3. Minimum age and parental agreement
3.1 Zeno is aimed at learners aged seven and above. Anyone younger may not use Zeno.
3.2 If you are at least seven but not yet 18 years old, you have limited legal capacity under German law. Entering into a paid subscription therefore requires the agreement of your parent or guardian. By ordering a paid subscription you confirm that this agreement exists, or that you are paying out of means placed at your disposal for that purpose.
3.3 Without the necessary agreement, the contract for the paid subscription is ineffective. In that case we cancel it and refund amounts already paid; please contact us at team@zenostudy.app.
3.4 Section 3.2 applies accordingly to free use insofar as the law requires.
4. Services, AI notice and changes
4.1 The features available at any given time are as described in the application.
4.2 Notice on AI-generated content. Answers, summaries, flashcards, quiz questions and revised texts are generated wholly or partly by artificial intelligence. Such systems can produce factually wrong, incomplete or misleading results. Check anything important critically and against your official course materials. What we owe is the provision of the AI features, not the factual correctness of their output.
4.3 Your own assessed work. The examination and coursework rules of your school or university are unaffected. Whether and to what extent you may use AI tools is for you to establish. We accept no liability for the consequences of impermissible use.
4.4 We may develop and adapt the application, in particular to reflect technical progress, changed requirements of the service providers we use, or legal requirements. Changes to paid features are permissible only if they are reasonable for you and do not impair contractual use; you will be informed in advance and, where the impairment is more than immaterial, may terminate the contract free of charge within 30 days (§ 327r of the German Civil Code).
4.5 Fair use. Operating the AI features costs money per request. Where usage substantially exceeds normal individual use, we may temporarily limit it. We will give notice where we can.
5. Prices, subscription and free trial
5.1 Basic use of Zeno is free of charge. Extended features are offered as a paid subscription, with either a monthly or an annual term.
5.2 The price that applies is the one shown to you in the ordering process immediately before you order. All prices are final prices and include statutory VAT. Prices may change for new orders at any time and may differ in the course of price testing; for a running subscription, the price shown when it was concluded always applies.
5.3 Free trial. For the annual subscription we offer a free trial of seven days. It begins when the subscription is concluded. Unless the subscription is cancelled before the trial ends, it converts automatically into the paid annual subscription and the annual price is charged at the end of the trial. We show you the price that will be charged and this conversion before you order. The trial is available once per person.
5.4 We will only apply a price increase to a running subscription with effect from the end of the current term and after giving at least six weeks' notice in text form. You may cancel the subscription up to the point at which the increase takes effect.
6. Payment
6.1 Payments are processed by our payment service provider Stripe. The payment methods offered there apply.
6.2 The fee falls due in advance at the start of each term, or on expiry of a free trial where there is one. Where a subscription renews automatically, the fee falls due at the start of each new term.
6.3 If a charge fails for a reason within your control, we may suspend access to the paid features until payment is made. Your data is unaffected.
7. Term and cancellation
7.1 The free contract of use runs for an indefinite period. You can end it at any time without notice by deleting your account in the settings.
7.2 A subscription runs for the term chosen and renews automatically for the same term unless it is cancelled before the end of the current period.
7.3 You may cancel at any time with effect from the end of the current term. You can do so directly in the application, in the subscription management area, which carries the cancellation button German law requires (§ 312k of the German Civil Code). Alternatively an informal message to team@zenostudy.app is enough.
7.4 After cancelling you keep the paid features until the end of the term you have paid for. After that Zeno remains available to you at the free tier; your content is retained for as long as your account exists.
7.5 The right of either party to terminate for good cause is unaffected.
8. Right of withdrawal for consumers
If you are a consumer, you have the following right of withdrawal.
Withdrawal policy
Right of withdrawal
You have the right to withdraw from this contract within 14 days without giving any reason. The withdrawal period is 14 days from the day the contract was concluded.
To exercise your right of withdrawal you must inform us
Systeme Digital GmbH, Wandlhamerstraße 34a, 82166 Gräfelfing, Germany, phone +49 89 416137404, e-mail team@zenostudy.app
of your decision to withdraw from this contract by an unequivocal statement (for example a letter sent by post, or an e-mail). You may use the model withdrawal form set out below, but it is not obligatory.
To meet the withdrawal deadline, it is sufficient for you to send your communication concerning your exercise of the right of withdrawal before the withdrawal period has expired.
Effects of withdrawal
If you withdraw from this contract, we shall reimburse to you all payments received from you without undue delay and in any event not later than 14 days from the day on which we are informed about your decision to withdraw from this contract. We will carry out such reimbursement using the same means of payment as you used for the initial transaction, unless you have expressly agreed otherwise; in any event, you will not incur any fees as a result of such reimbursement.
If you requested that the provision of services begin during the withdrawal period, you shall pay us an amount which is in proportion to what has been provided until you have communicated to us your withdrawal from this contract, in comparison with the full coverage of the contract.
End of withdrawal policy
Model withdrawal form
If you wish to withdraw from the contract, please complete and return this form.
- To: Systeme Digital GmbH, Wandlhamerstraße 34a, 82166 Gräfelfing, Germany, e-mail: team@zenostudy.app
- I/We (\*) hereby give notice that I/We (\*) withdraw from my/our (\*) contract for the provision of the following service (\*)
- Ordered on (\*)/received on (\*)
- Name of consumer(s)
- Address of consumer(s)
- Signature of consumer(s) (only if this form is notified on paper)
- Date
(\*) Delete as appropriate.
Note on the right of withdrawal and the free trial
If you take out a subscription with a free trial, the withdrawal period starts when that contract is concluded. Because we tell you before you order that the trial converts automatically into a paid subscription and at what price, no new right of withdrawal arises when it converts. Independently of that, you can cancel at any time under section 7 and so prevent any charge from arising.
9. Rules of use
9.1 Your sign-in credentials are personal to you. Passing your account to anyone else is prohibited.
9.2 You receive a simple, non-transferable right to use Zeno's content for your own private, school, university or professional study purposes.
9.3 In particular, you may not:
- systematically reproduce, distribute, make publicly available or commercially exploit the application's content outside Zeno;
- use automated scripts, bots or other software to extract content, overload the application or circumvent security measures;
- use the AI features to generate content that is unlawful, abusive, racist, glorifies violence, is pornographic or is harmful to minors, or to infringe the rights of others;
- upload content you do not hold the necessary rights to, or that contains particularly sensitive personal data about other people.
10. Rights in content
10.1 All rights in the application, its design and its content belong to us or our licensors.
10.2 Nothing changes about the content you create or upload: it remains yours. You grant us only the simple right to store and process it, and to transmit it to the service providers used for the feature in question, to the extent necessary to provide the application to you. We do not use your content to train AI models of our own.
10.3 For results generated by the AI, we grant you, to the extent rights in them accrue to us, the right to use them freely. Machine-generated results may attract no copyright protection at all; whether and to what extent you may exploit them follows from the law and is outside our influence.
11. Suspension and termination for good cause
11.1 Where there is a serious or repeated breach of section 9, we may temporarily suspend your account and terminate the contract for good cause. Before suspending we will, where we can, point out the breach and give you the opportunity to remedy it, unless the seriousness of the breach makes that unreasonable.
11.2 If we terminate a paid subscription for good cause, we refund the portion of the fee attributable to the unused remainder of the term, unless we have suffered loss of at least that amount.
12. Availability and defects
12.1 We provide Zeno with the care customary on the internet. We cannot promise uninterrupted availability; maintenance, faults at our service providers and circumstances outside our control can cause interruptions. We give notice of planned maintenance where we can.
12.2 For paid subscriptions, the statutory provisions on contracts for digital products (§§ 327 et seq. of the German Civil Code) apply, in particular as regards conformity, the obligation to provide updates, and your rights where there is a defect.
13. Liability
13.1 We are liable without limitation for intent and gross negligence, for injury to life, body or health, under the German Product Liability Act, and to the extent of any guarantee we have given.
13.2 Where we breach a material contractual obligation through slight negligence — an obligation whose fulfilment makes proper performance of the contract possible in the first place and on whose observance you may regularly rely — our liability is limited in amount to the foreseeable loss typical of this kind of contract at the time it was concluded.
13.3 Otherwise our liability is excluded.
13.4 We are not liable for disadvantages arising because you relied on factually incorrect output from the AI features without checking it (section 4.2), or because you used AI tools contrary to the rules of your educational institution (section 4.3).
13.5 Statements in our advertising about learning outcomes, improvements in grades or user numbers are based on internal analysis and experience. They are neither a guarantee nor a warranty. Individual results depend on your own effort, how regularly you use Zeno, and your starting point.
13.6 We are liable for loss of data only to the extent that the loss would also have occurred had you backed up your data properly and regularly. You should keep an additional copy of anything important outside Zeno.
14. Changes to these Terms
14.1 We may change these Terms with effect for the future where there is an objective reason to — in particular a change in the law, a decision of the higher courts, a change to what we offer, or a gap in these Terms.
14.2 We will notify you of the change in text form at least six weeks before it takes effect. If you do not object before it takes effect, the change is deemed accepted. We will point out this consequence and your right to object separately in that notice. If you object, we may terminate the contract at the earliest possible date.
14.3 Changes to the core of the service or to the fee cannot be made this way; section 5.4 governs those.
15. Final provisions
15.1 The law of the Federal Republic of Germany applies, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer, the mandatory consumer protection provisions of the state in which you are habitually resident are unaffected.
15.2 We are neither willing nor obliged to take part in dispute resolution proceedings before a consumer arbitration board (§ 36 VSBG).
15.3 Should any provision of these Terms be or become ineffective, the remaining provisions remain unaffected. The statutory rule takes the place of the ineffective provision.
15.4 You may assign claims under this contract only with our agreement. You may set off only against claims that are undisputed or have been finally determined by a court.