Terms of Use

1Acceptance of these terms

These Terms of Use (“Terms”) form a binding agreement between you (“you”, “the user”) and Andrii Matiushev, the independent developer publishing as “Zydeno” (“Zydeno”, “we”, “us”, “our”), the developer of the Migrella application, including its Apple Watch app, Home Screen / Lock Screen widgets, and Live Activities (together, “the app”). By downloading, installing, accessing, or using the app, you confirm that you have read, understood, and agree to be bound by these Terms and by our Privacy Policy. If you do not agree, do not use the app.

2Eligibility & age

You must be legally able to enter into this agreement in your jurisdiction. The app is intended for adults and older teenagers managing migraine; if you are a minor, you may use it only with the involvement and consent of a parent or legal guardian, who agrees to these Terms on your behalf. Purchases (including Migrella Premium) may only be made by someone with the legal capacity to do so, or with parental consent — for example via Apple’s Ask to Buy / Family Sharing controls. By using the app you represent that the information you enter is your own (or that of someone you are authorized to track on their behalf).

3What Migrella is

Migrella is an informational, lifestyle and wellness tool for people living with migraine and headache. It lets you:

• log migraine and headache attacks (severity, pain location and quality, aura, symptoms, suspected triggers, relief, duration) and keep a private daily check-in (sleep, stress, mood, energy, water, cycle and more);
• track medications and doses, treatments, appointments and custom factors / triggers;
• view a personal barometric-pressure forecast and a personalized risk outlook, plus on-device trigger / protector insights and a medication-overuse safety guard;
• complete validated questionnaires such as MIDAS and HIT-6 and view their trends, and read an educational library with cited sources;
• generate a PDF report or CSV export for your own use, and use the Apple Watch app, widgets, Live Activities and Siri Shortcuts.

The app is free to download and its core features are free to use, with no accounts and no Migrella servers; your data is stored only on your device, with no iCloud sync (see Privacy Policy). An optional paid upgrade, Migrella Premium, unlocks additional features — see §13 for purchase, billing, renewal and cancellation terms.

4License to use the app

Subject to your compliance with these Terms, Zydeno grants you a personal, limited, non-exclusive, non-transferable, non-sublicensable, revocable license to download and use one copy of the app on Apple-branded devices that you own or control, for your personal, non-commercial use, as permitted by the App Store Licensed Application End User License Agreement (“Standard EULA”). These Terms supplement, and where permitted prevail over, the Standard EULA. You may not copy, modify, reverse-engineer, decompile, distribute, sell, rent, or create derivative works of the app except to the extent this restriction is prohibited by applicable law.

5Not medical advice — important

• Insights are statistical, not clinical. The risk forecast, pressure sensitivity, and trigger / protector maps are associations computed from your own entries; they are awareness aids, not predictions, diagnoses, or treatment recommendations.
• Questionnaires are screening tools. MIDAS, HIT-6, and the cluster-headache screener are standardized self-assessments that help structure a conversation with a clinician; a score is not a diagnosis.
• Medication-overuse alerts are informational. They flag general published thresholds and are not a directive about your treatment. Never start, stop, or change a medication based on the app — consult your physician or pharmacist.
• Always seek the advice of a qualified physician, neurologist, or other healthcare professional with any questions about a medical condition, medication, or treatment, and do not disregard or delay professional advice because of something in the app.
• In an emergency — a sudden “worst-ever” or thunderclap headache, or a headache with fever, stiff neck, confusion, weakness, numbness, fainting, or vision/speech changes, or following a head injury — stop and call your local emergency number immediately.

You acknowledge and agree that any reliance on the app’s information is solely at your own risk.

6Educational content & citations

Migrella includes educational articles, a glossary, quizzes, and research summaries, with references to recognized sources such as the International Classification of Headache Disorders (ICHD-3), the American Migraine Foundation (AMF), the American Headache Society (AHS), and similar bodies. This material is provided for general information “as is”, may be simplified or summarized, may not reflect the most recent guidance, and is not tailored to you. Citations to third-party sources do not imply their endorsement of the app. Always rely on your own clinician for advice specific to your situation.

7Third-party data & accuracy

Barometric-pressure, temperature and humidity forecasts are supplied by Open-Meteo, an independent open-data weather service, and historical pressure is supplied by its archive API. This data is modeled and may be incomplete, inaccurate, delayed, or unavailable in your region. Apple Health metrics are provided by your own devices via Apple HealthKit. Zydeno does not create, verify, or warrant this third-party data and is not responsible for it. The app shows what is available and does not guess when data is missing.

8Your responsibilities

You are solely responsible for: the entries, medications, factors, and other information you record; verifying any health or medication decision with your healthcare professional; how you interpret and act on the app’s information; keeping your device secure; and maintaining your own backups (for example via the in-app JSON export or your encrypted device backup). You use the app at your own risk and remain responsible for all decisions you make.

9Acceptable use

You agree not to: use the app for any unlawful purpose or in violation of any applicable law; interfere with, disrupt, or attempt to gain unauthorized access to the app, its data provider, or their systems; scrape, overload, or abuse the third-party API the app relies on; remove or obscure any proprietary notices; or use the app in any way that could harm, disable, or impair it or interfere with another party’s use.

10Your content & privacy

Content you create in the app — attacks, check-ins, notes, medications, factors, assessments — is yours and is stored only on your device (there is no iCloud sync). Zydeno does not collect, access, host, or back it up, and claims no ownership or rights over it. You are responsible for it and for any backups. Our handling of information is described in the Privacy Policy, which is incorporated into these Terms by reference.

11Intellectual property

The app, including its software, design, “Editorial Bold” visual identity, the Migrella name and logo, text, and other original content, is owned by Zydeno and protected by intellectual-property laws. Except for the license in §4, no rights are granted to you. Third-party data is provided under its own license — for example, Open-Meteo weather data under CC BY 4.0. Third-party names, brands, and trademarks belong to their respective owners and are used for identification only; their use does not imply any endorsement or affiliation.

12Third-party services & links

The app relies on and links to third-party services and websites (the Open-Meteo weather service; Apple services such as HealthKit, StoreKit and Maps geocoding; and cited health authorities such as ICHD/IHS, AMF, AHS). We do not control these third parties, do not endorse them, and are not responsible for their content, availability, accuracy, or practices. Your use of any third-party service is governed by that party’s own terms and privacy policy.

13Purchases, subscriptions & advertising

13.1 Free core & Migrella Premium

Migrella is free to download, and its core features are free to use — including unlimited attack logging, the diary and calendar, today’s pressure, medication reminders, MIDAS/HIT-6 scoring, the medication-overuse safety guard, custom factors, Apple Health metrics, basic PDF export, widgets, Live Activities, Siri Shortcuts and the Apple Watch app. An optional premium upgrade, Migrella Premium (“Premium”), unlocks additional features — for example the trigger & protector maps, the 7-day pressure forecast, pressure & weather alerts, advanced doctor-ready reports, MIDAS & HIT-6 trends, and the treatment-effectiveness tracker. The exact set of Premium features is shown in the app and may evolve over time. We may also change which features are free and which require Premium, and we do not promise that any particular feature will remain free. Premium is offered as:

• Migrella Premium — Monthly: an auto-renewable subscription with a 1-month billing period;
• Migrella Premium — Yearly: an auto-renewable subscription with a 1-year billing period;
• Migrella Premium — Lifetime: a one-time purchase (not a subscription; nothing renews) that unlocks Premium for the Apple Account that bought it (see §13.6).

The current price of each option, the billing period, and any free-trial length are always displayed in the app and on the App Store, in your local currency, before you confirm a purchase. Prices may vary by region and may include applicable taxes.

13.2 Billing & automatic renewal

• All purchases are made through Apple and are charged to your Apple Account at confirmation of purchase (or, where a free trial is offered, at the end of the trial period).
• Subscriptions renew automatically unless auto-renewal is turned off at least 24 hours before the end of the current period. Your Apple Account is charged for the renewal, at the then-current price, within 24 hours prior to the end of the current period.
• You can manage or cancel your subscription, and turn off auto-renewal, at any time in your App Store account settings (Settings → [your name] → Subscriptions on your device) or via the “Manage subscription” link in the app’s Settings. Deleting the app does not cancel a subscription.
• If you cancel, your subscription stays active until the end of the period you have already paid for; the remaining period is not refunded, except where required by law or granted by Apple (§13.5).

13.3 Free trial

A subscription may include an introductory free trial (for example, 7 days), as shown on the purchase screen. You are not charged during the trial; the trial converts automatically into a paid subscription at the price shown unless you cancel auto-renewal at least 24 hours before the trial ends. Any unused portion of a free trial is forfeited when you purchase a subscription or the Lifetime unlock. Eligibility for introductory offers (typically one per Apple Account) is determined by Apple.

13.4 Price changes

We may change prices for new purchases at any time. If the price of your existing subscription increases, Apple will notify you in advance and, where required, ask for your consent before the new price applies; if you do not agree, you can cancel before the next renewal and keep access until the paid period ends.

13.5 Refunds & restoring purchases

Purchases are processed by Apple, and refunds are handled by Apple under the Apple Media Services Terms — we cannot issue refunds ourselves. To request a refund, use reportaproblem.apple.com or your App Store purchase history. Your statutory consumer rights — for example, the 14-day withdrawal right for digital content in the EU/UK, and equivalent refund or cooling-off rights in other countries — are unaffected and are exercised through Apple. If you reinstall the app or switch devices, tap “Restore Purchases” in the app to re-activate Premium on the same Apple Account free of charge.

13.6 About the “Lifetime” purchase

The Lifetime option is a one-time, non-consumable purchase tied to your Apple Account. “Lifetime” means for the lifetime of the Migrella app and service as offered by the developer; it is not a promise that the app, any particular feature, or any third-party data source will remain available indefinitely. If the app is discontinued, or a feature is changed or removed, §17 (changes & termination) and §14–§15 apply. It does not include any separate or future paid app that we may publish.

13.7 Changes to Premium & availability

The specific features included in Premium may change as the app evolves, and §17 applies to paid features as well. We are under no obligation to provide updates, new features, or continued availability. If the app fails to conform to an applicable warranty, you may notify Apple for a refund of the purchase price, as described in §18.

13.8 Advertising

The app currently contains no advertising. We reserve the right to introduce advertising (which may involve third-party advertising or analytics providers) in future versions. If we do, any new data practices will be reflected in an updated Privacy Policy and App Store privacy label before they take effect.

14Disclaimer of warranties

To the maximum extent permitted by applicable law, the app and all information it provides are offered “AS IS” and “AS AVAILABLE”, without warranties of any kind, whether express, implied, or statutory, including any implied warranties of merchantability, fitness for a particular purpose, accuracy, non-infringement, and any warranty that the app will be uninterrupted, error-free, secure, or that data will be complete, accurate, or current. Some jurisdictions do not allow the exclusion of certain warranties, so some of the above may not apply to you; in that case, such warranties are limited to the minimum scope permitted by law.

Consumers keep their statutory rights. Nothing in these Terms excludes, restricts, or modifies any right or guarantee that mandatory consumer law gives you and that cannot lawfully be waived — for example, the legal guarantee of conformity for digital content and services in the EU and UK, the consumer guarantees under the Australian Consumer Law, and equivalent protections in other countries. Where such rights apply, they prevail over the disclaimers above to the extent of any conflict.

15Limitation of liability

To the maximum extent permitted by applicable law, in no event will Zydeno or its developers, officers, or affiliates be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, or for any loss of profits, data, goodwill, or for any personal injury, illness, allergic or adverse reaction, or health consequence, arising out of or related to your use of (or inability to use) the app or your reliance on its information — even if advised of the possibility of such damages, and regardless of the legal theory.

To the maximum extent permitted by law, Zydeno’s total aggregate liability for all claims relating to the app will not exceed the greater of (a) the amounts you paid (through Apple) for the app — including Migrella Premium subscriptions and purchases — in the 12 months before the claim, or (b) USD $10.

Nothing in these Terms excludes or limits liability that cannot lawfully be excluded or limited — including, where the law so provides, liability for death or personal injury caused by our negligence, for fraud or fraudulent misrepresentation, for willful misconduct or gross negligence, or under mandatory product-liability and consumer-protection laws. Some jurisdictions do not allow certain limitations, so some of the above may not apply to you, and you may have additional rights that vary by country.

16Indemnification

To the extent permitted by law, you agree to indemnify and hold harmless Zydeno and its developers and affiliates from any claims, damages, losses, liabilities, and expenses (including reasonable legal fees) arising out of your misuse of the app, your violation of these Terms, or your violation of any law or the rights of any third party.

17Changes to the app & termination

We may modify, suspend, or discontinue the app or any feature at any time, with or without notice. These Terms apply until terminated. Your license terminates automatically if you breach them; you may terminate at any time by deleting the app. Sections that by their nature should survive termination (including §§5–7, 10–12, 14–16, 18–20) will survive.

18Apple-specific terms

These Terms are between you and Zydeno only, not with Apple Inc. (“Apple”). Apple is not responsible for the app or its content. To the extent the app is downloaded from the Apple App Store, the following apply:

1. Scope of license. The license granted to you is limited to a non-transferable license to use the app on Apple-branded products you own or control, as permitted by the Usage Rules in the Apple Media Services Terms and Apple’s Standard EULA.
2. Maintenance & support. Zydeno is solely responsible for any maintenance and support for the app. Apple has no obligation to furnish any maintenance or support services.
3. Warranty. Zydeno is solely responsible for any product warranties, whether express or implied by law, to the extent not effectively disclaimed. If the app fails to conform to any applicable warranty, you may notify Apple, and Apple may refund the purchase price (if any); to the maximum extent permitted by law, Apple has no other warranty obligation with respect to the app.
4. Product claims. Zydeno, not Apple, is responsible for addressing any claims relating to the app or your use of it, including (i) product-liability claims; (ii) any claim that the app fails to conform to any applicable legal or regulatory requirement; and (iii) claims arising under consumer-protection, privacy, or similar legislation.
5. Intellectual-property claims. Zydeno, not Apple, is responsible for the investigation, defense, settlement, and discharge of any third-party claim that the app or your use of it infringes that third party’s intellectual-property rights.
6. Legal compliance. You represent that you are not located in a country subject to a U.S. Government embargo or designated as “terrorist-supporting,” and that you are not on any U.S. Government list of prohibited or restricted parties.
7. Developer contact. Questions, complaints, or claims about the app should be directed to Zydeno at [email protected].
8. Third-party beneficiary. You acknowledge and agree that Apple and its subsidiaries are third-party beneficiaries of these Terms, and that upon your acceptance Apple will have the right (and is deemed to have accepted the right) to enforce these Terms against you as a third-party beneficiary.

19Governing law & disputes

These Terms are governed by the laws of Ukraine, the jurisdiction in which the developer is established, without regard to its conflict-of-laws rules, and you and Zydeno agree to the exclusive jurisdiction of its competent courts, except where mandatory consumer-protection law in your country of residence provides otherwise. If you are a consumer, you retain the benefit of any mandatory provisions of the law of your country of residence, and nothing here deprives you of that protection; if that law gives you the right to bring or defend proceedings in the courts of your country of residence, that right is unaffected. You agree to first attempt to resolve any dispute informally by contacting [email protected].

20General provisions

• Entire agreement. These Terms, together with the Privacy Policy and Apple’s Standard EULA, are the entire agreement between you and Zydeno regarding the app.
• Severability. If any provision is held unenforceable, the rest remains in full force, and the unenforceable part is modified to the minimum extent necessary.
• No waiver. Our failure to enforce any provision is not a waiver of it.
• Assignment. You may not assign these Terms; we may assign them in connection with a merger, acquisition, or transfer of assets.
• Language. These Terms may be provided in translation; if there is a conflict, the English version controls to the extent permitted by law.

21Changes to these terms

We may update these Terms to reflect changes to the app or the law. When we do, we will revise the “Last updated” date above and, where appropriate, note the change in the app or on this page. Your continued use of the app after changes take effect constitutes acceptance of the revised Terms. If you do not agree, stop using the app.

22Contact us

Questions about these Terms?

• Email: [email protected]
• Website: zydeno.com
• Developer: Andrii Matiushev (publishing as Zydeno)