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Meridian: Terms of Use

Last updated: June 14, 2026

Publisher: Aubora SASU (société en formation), acting through its founder for the company in formation, France.
Contact: contact@cerno.me

These Terms of Use (the “Terms”) govern your use of the Meridian application (“Meridian” or the “App”). They form a binding agreement between you and the publisher. Please read them before you use the App. The Privacy Policy and the Health Disclaimer are part of these Terms and are incorporated by reference.

1. Publisher identification

Meridian is published by Aubora SASU, a simplified joint-stock company in formation under French law. Until the company is registered with the Registre du commerce et des sociétés (RCS), it has no separate legal personality. During this period the founder publishes the App on the company's behalf, acting “pour le compte de la société Aubora SASU en formation,” and is personally responsible for the publishing acts. Once Aubora SASU is registered, it will take up (reprise) those acts, which will then be treated as the company's own from the outset. This block will be updated at that point with the company's RCS number, share capital, and registered office.

This identification is published to meet the editor-identification duty under Article 1er-1 of Law no. 2004-575 of 21 June 2004 (LCEN).

2. What Meridian is, and what it is not

Meridian is a personal well-being and self-knowledge journal. You log the medication you have been prescribed (drug, dose, time), and the App draws a pharmacokinetic estimate of the active substance in your body across the day against reference bands you can edit. A Test mode lets you explore hypothetical regimens. The History view is a titration journal where you can also record how a day felt.

Meridian's intended purpose is non-medical. Three points are load-bearing:

Always follow your prescriber and the patient information leaflet. Never change your medication, dose, or timing based on anything shown in the App without talking to a qualified healthcare professional. The Health Disclaimer develops these points and forms part of these Terms.

3. Acceptance of these Terms

By downloading, installing, or using Meridian, you accept these Terms. They are made available to you before and during use, through an in-app legal screen, so that you can read them. If you do not accept them, do not use the App. Where any in-app specific condition conflicts with these general Terms, the specific condition prevails for the point it covers.

4. Eligibility and minors

Meridian is intended for users aged 16 or over and is not directed to children under 16. French law allows a minor to consent alone to information-society services from the age of 15; for a user under that age, a holder of parental authority must consent together with the minor. Because the App handles health information about prescribed medication, the publisher sets 16 as the minimum age and asks younger users not to use it.

5. Licence of use

The publisher grants you a personal, non-exclusive, non-transferable, revocable licence to use Meridian on devices you own or control, for your own private and non-commercial use, in the form in which it is supplied. This licence gives you no right in the App's source code, design, or content beyond ordinary use. Your use of the App through the App Store is also subject to Apple's standard Licensed Application End User License Agreement, which applies in addition to these Terms.

6. Acceptable use

You agree to use Meridian lawfully and only for its intended personal purpose. You agree not to:

7. Price, and data is not the price

Meridian is free. There is no purchase price, no paid tier, no advertising, and no feature is locked behind payment. Your personal data is not collected or used as a counterpart for access to the App: the publisher operates no servers, runs no analytics, ships no third-party tracking, and has no access to your data. Because the App is free and does not take your data as payment, the pre-contractual information regime for onerous consumer contracts (Article L111-1 of the Consumer Code) does not, in our understanding, apply to it.

8. Optional support for the developer

If you wish, you can support the developer through an optional contribution. An in-app button opens an external payment page in your browser (Safari), operated by our payment provider. This is entirely optional and unlocks nothing: it gates no feature, changes nothing in the App, and Meridian stays fully free whether or not you contribute. The contribution goes to the developer of a free app. It is not a charity collection or a fundraiser for any third-party cause, and no payment is taken inside the App.

9. Your data and privacy

Your medication and well-being entries are stored on your device. The publisher operates no servers and has no access to your data. The current version offers no synchronization: your data exists only on your device. If a future version offers optional iCloud synchronization (off by default and under your control), your data would synchronize through your own private Apple iCloud account, with Apple Inc. acting as a data processor for that synchronization under Apple's terms; the publisher would never be a recipient of the synchronized data and still could not access it. You can view, edit, export to JSON or CSV from Settings, or delete your data at any time. How your data is handled, your rights, retention, any future international transfers through iCloud, and the legal bases are set out in the Privacy Policy, which forms part of these Terms.

10. Important warnings and limits of the App

You acknowledge and accept the following, which describe what the App is and how it should be used:

11. Availability and “as is” use

Meridian is provided as is and as available. The publisher does not promise that it will always be available, error-free, or uninterrupted, or that the estimates will be accurate for you. The publisher draws the App's default estimates from reputable, current scientific sources, which it maintains to the best of its ability, but it does not guarantee their accuracy. You can also tailor the model to yourself by editing its pharmacokinetic parameters, the intensity, and the thresholds; the more you adjust it, the more it reflects your own assumptions rather than the defaults, and either way it remains an estimate, never a measurement. The Health Disclaimer develops this point. The publisher may update, change, or discontinue the App or any feature. Within the limits French law allows, and without reducing the rights described in Section 12, warranties that can lawfully be set aside are excluded.

12. Liability

The publisher is liable for harm it causes through its own fault, on the terms and within the limits of applicable law. Nothing in these Terms excludes or limits liability that the law does not allow to be excluded or limited, in particular liability for death or personal injury caused by the publisher's fault, liability for gross negligence or wilful misconduct, and the protections that French consumer law gives you as a consumer. Any clause that would suppress or reduce a consumer's right to compensation is treated as unwritten under French law, and these Terms do not seek to do that.

Within those limits, and because Meridian is a free tool that shows estimates and gives no medical advice, the publisher is not liable for decisions you make about your medication, which remain yours and your prescriber's, nor for harm that results from inaccurate inputs, a wrong device clock, lost or exported data, or use of the App contrary to these Terms or to the Health Disclaimer. This Section does not deprive these Terms of their substance and is read consistently with Articles 1170 and 1231-3 of the Civil Code.

If you use Meridian as a consumer in the United States, nothing in these Terms, including the liability and governing-law provisions, limits or waives any non-waivable right or remedy that United States federal law or the law of your state of residence grants you as a consumer. Where such mandatory law applies, it prevails over the governing law chosen in these Terms to the extent that law requires, and only to that extent.

13. Intellectual property

The App, its name “Meridian,” its design, interface, code, and content are protected and belong to the publisher or its licensors. These Terms transfer no intellectual property right to you beyond the limited licence in Section 5. You keep all rights in the data you enter.

14. Term and termination

These Terms apply for as long as you use the App. You may stop using Meridian and delete it at any time; deleting the App removes the on-device data. If a future version offers optional iCloud synchronization and you enable it, turning that synchronization off and deleting your data would remove the synchronized copies. The publisher may suspend or end your right to use the App if you seriously or repeatedly breach these Terms, in a way proportionate to the breach, without prejudice to your statutory rights.

15. Changes to these Terms

The publisher may change these Terms, for example to reflect changes to the App or to the law. The “last updated” date will change, and material changes will be brought to your attention in the App. Changes are not retroactive, and your continued use after a change means you accept the updated Terms for your future use.

16. Governing law and jurisdiction

These Terms are governed by French law. Any dispute will be brought before the courts of Paris, without prejudice to the mandatory consumer-protection rules that apply to you. If you are a consumer, those rules may let you bring proceedings before the courts of the place where you live, and you keep the protection of the mandatory provisions of the law of your country of residence.

The same protection applies to consumers in the United States: the mandatory consumer-protection rules of United States federal law and of your state of residence continue to apply to you despite the choice of French law, to the extent they cannot be waived.

Complaint and mediation. Before bringing any court proceedings, please first send your complaint to the publisher at contact@cerno.me and allow a reasonable period, of at least thirty (30) days, for us to resolve it. If the dispute is not resolved within that period, the parties will then seek an amicable resolution through mediation before going to court.

If you are a consumer, you have the right under Article L612-1 of the French Consumer Code to use a consumer mediator (médiateur de la consommation) free of charge for the amicable resolution of a dispute. Because Meridian is a free application and takes no payment from you, it is uncertain whether this regime fully applies; we nonetheless offer you this path. Once a mediator is designated, the name and website of the competent consumer mediator will be inserted here, as required by Article L616-1 of the Consumer Code.

Nothing in this Section prevents you from bringing a direct action where mandatory law allows it, and it does not affect your right, as a consumer, to bring proceedings before the courts of the place where you live.

17. Miscellaneous

If a court finds any clause of these Terms invalid or unenforceable, the rest stays in force. The publisher's failure to enforce a right is not a waiver of it.

18. Contact

Questions about these Terms: contact@cerno.me.