Terms and Conditions
Last updated: August 2026
1. Provider and scope
These terms apply to your use of the Go Lucid app and website, provided by Nine to Zero UG (haftungsbeschränkt), Malzer Chaussee 173, 16515 Oranienburg, Germany, email mail@ninetozero.de.
Purchases made through an app store are additionally subject to that store operator's terms. Where these terms conflict with mandatory consumer rights, the consumer rights prevail.
2. What Go Lucid is
Go Lucid is an app for keeping a dream journal and practising techniques around lucid dreaming. It includes a journal, reality-check reminders, guided sessions, analyses of your own entries and optional AI features.
The app is built local-first: the core functions run on your device and without an account. An account is optional and enables synchronisation across devices.
3. Not a health or medical service
Go Lucid is not a medical device, not a therapy and not a substitute for medical or psychological treatment. The app makes no diagnoses and gives no medical recommendations.
Lucid dreaming is a documented phenomenon of REM sleep. The effectiveness of the common techniques has been studied only to a limited extent, and outcomes vary widely between individuals. We promise no particular outcome and state no timeframe within which anything should happen.
Some techniques involve waking deliberately during the night. That can affect sleep quality. Use such techniques deliberately rather than every night. If you experience sleep problems, distressing dreams or health complaints, please consult a doctor or another suitable professional. Sufficient sleep takes priority over any exercise.
4. Use of the app and accounts
By installing and using the app, a free contract of use for the free features comes into effect between you and us. No account is required for that.
If you create an account, you are responsible for the accuracy of your details and for keeping your credentials confidential. You can delete the account at any time within the app. An account is personal and not transferable.
5. Free and paid features
Some features are permanently available at no cost. Further features require a paid tier. Which features these are is described in the app before purchase.
Features already offered free of charge are not moved behind payment afterwards.
6. Purchases through the app stores
Paid tiers are handled exclusively through the app store you obtained the app from. Payment, billing and subscription management run through your account there and under that store operator's terms. We receive neither your payment details nor a billing address.
The applicable price and billing period are shown to you before purchase, in the store or in the app.
7. Term, renewal and cancellation
Subscriptions renew automatically for the selected period unless you cancel before the current period ends. Cancellation and subscription management take place in your app store account settings.
Deleting your Go Lucid account does not end a store subscription. Cancel it separately in the relevant store, otherwise billing continues.
A one-off, permanent purchase does not renew and is not billed recurrently.
8. Right of withdrawal
Consumers generally have a fourteen-day right of withdrawal for distance contracts. Because paid tiers are concluded exclusively through the app stores, withdrawal and refunds follow the terms and the process of the relevant store operator. For a refund, please contact the store you purchased through.
For digital content, the right of withdrawal may lapse early where performance began with your express consent before the withdrawal period ended and you acknowledged that you thereby lose that right. Your statutory rights otherwise remain unaffected.
9. Rights of use
We grant you a simple, non-transferable right to use the app for your own private purposes for as long as this contract runs. All rights in the app and in its content, texts, audio and design elements remain with us or the respective rights holders.
You may not reproduce, distribute or make the content publicly available beyond private use, reverse-engineer the app except where the law permits it, or circumvent technical access restrictions.
Your own entries belong to you. We process them solely to provide the features of the app and do not analyse them for advertising.
10. Your obligations
You will not use the app unlawfully and will not impair its security or availability. You will not access other people's accounts or attempt to circumvent access or usage limits.
You share responsibility for backing up your own data. The app provides an export function for this. Use it regularly, particularly if you work without an account, because your data then exists only on your device.
11. Availability and further development
We aim for reliable operation but do not owe any particular level of availability. Maintenance, disruptions at service providers or circumstances beyond our control can lead to interruptions. The local-first core functions are generally unaffected.
We may develop the app further and change or discontinue individual features, provided this is reasonable for you and does not materially reduce the agreed scope of a paid tier. We will inform you in advance of any material reduction.
12. AI features
Optional AI features run only when you explicitly trigger them. The text required for that is transmitted to a service provider; details are set out in the privacy notice.
Results of an AI interpretation are non-binding prompts for your own reflection. They are not statements of fact, not predictions and not a professional assessment. AI results can be inaccurate. Technical limits and usage quotas may apply to the availability of these features.
13. Liability
We are liable without limitation for intent and gross negligence, for injury to life, body or health, for fraudulently concealed defects, within the scope of any guarantee given, and under the German Product Liability Act.
For slight negligence we are liable only for breach of a material contractual obligation, meaning an obligation whose fulfilment makes 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 type of contract.
Liability is otherwise excluded. Liability for loss of data is limited to the effort that would have been required for recovery had you carried out proper and regular backups.
14. Termination by us
We may terminate the free contract of use with reasonable notice. The right to terminate for good cause remains unaffected, in particular in the event of serious or repeated breaches of these terms. A period already paid for remains unaffected, provided continuing is reasonable for us.
15. Changes to these terms
We may change these terms where this is necessary for legal or technical reasons or in order to develop the app further, and where the change is reasonable for you. We will notify you of changes in advance, with reasonable notice, in the app or by email. If you do not object within the stated period, or if you continue using the app afterwards, the amended terms are deemed accepted. We will point this consequence out to you separately in the notification. If you do object, we may end the contract as of the date the change takes effect.
16. Governing law and dispute resolution
German law applies. If you are habitually resident in another Member State of the European Union, the mandatory consumer protection provisions of that state remain unaffected.
The European Commission provides a platform for online dispute resolution: https://ec.europa.eu/consumers/odr/. We are neither willing nor obliged to take part in dispute resolution proceedings before a consumer arbitration body.
17. Final provisions
Should any provision of these terms be invalid, the validity of the remaining provisions is unaffected.