Terms of Service

Effective Date: August 1, 2026

Last Updated: August 26, 2026

These Terms of Service (“Terms”) are a legal agreement between you and xCoefficient Inc. (“Chronotype,” “we,” “us,” or “our”), governing your access to and use of the Chronotype mobile application, any related websites, and all features, content, and services offered through them (collectively, the “Services”).

1. Eligibility

You must be at least 18 years old to use the Services. By using the Services, you represent that you meet this requirement and that you have the legal capacity to enter into this agreement. The Services are currently offered only to residents of the United States.

2. Description of the Services

Chronotype provides AI-generated coaching content related to sleep, physical activity, nutrition, and circadian rhythm, personalized using data you provide and data read from Apple HealthKit. The Services may include:

• Automated coaching messages, insights, and recommendations generated using large language model (“LLM”) technology;
• A voice-based coaching interface;
• Nutrition lookup via barcode scanning or photo, using third-party nutrition databases (see Section 7);
• Access to a catalog of “Agents” — configurable AI assistants built on our Agent Platform and provided by us;
• Integration with Apple HealthKit to read and, where applicable, write health and fitness data;
• Paid premium features, available via an Annual Subscription — see Section 5.

Chronotype is a general wellness product. It is not a medical device and does not provide medical care. See Section 3.

3. Medical Disclaimer — Please Read Carefully

Chronotype is not a substitute for professional medical advice, diagnosis, or treatment. The coaching content, scores, and recommendations generated by the Services are wellness information only, generated in part by AI systems that can be incomplete, generic, or incorrect.

• Always consult a qualified physician or other healthcare provider before starting, changing, or stopping any exercise, sleep, or nutrition regimen, particularly if you have any pre-existing medical condition, are pregnant, or are taking medication.
• Do not disregard, delay, or discontinue medical treatment because of anything you read or are told through the Services.
• The Services are not intended to diagnose, treat, cure, or prevent any disease.
• If you are experiencing a medical emergency, call 911 (or your local emergency number) immediately. Do not use the Services in an emergency.
• Data derived from Apple Watch, HealthKit, or any other consumer sensor is not clinical-grade and may be inaccurate.

Source and accuracy of health metrics. Chronotype does not itself measure, generate, or validate any physiological data. All health and fitness metrics — including but not limited to sleep and sleep-stage estimates, heart rate, heart-rate variability, respiratory rate, blood oxygen, step count, and calorie estimates — are read from Apple HealthKit and originate from Apple Watch, iPhone, or other third-party devices, apps, and sensors that we do not manufacture, operate, or control. These metrics are algorithmic estimates produced by those third-party devices from indirect signals; they are not direct clinical measurements and are not produced using the equipment (such as polysomnography, scalp electrodes, or eye sensors) required for clinical-grade measurement of sleep stages or other physiological states. We make no representation, warranty, or guarantee as to the accuracy, precision, completeness, or reliability of any such metric, and we are not responsible for errors, gaps, or inaccuracies originating from Apple HealthKit or any third-party device or sensor. Any scores, tiers, insights, or recommendations the Services generate are derived from these third-party estimates and are themselves estimates for general wellness purposes only, not measurements or findings of fact about your body.

You assume all risk associated with your use of, and reliance on, any health metric displayed by, and any coaching content provided through, the Services.

4. Your Profile & Local Data

• The Services do not currently require you to create a login account. Information you enter to personalize your experience — such as your name, email, date of birth, and goals — is stored locally on your device rather than on our servers.
• You are responsible for the accuracy of the information you enter and for the security of your device, since this information is stored there.
• Because there is no login, we have no way to distinguish or authenticate individual users of a shared or transferred device; you are responsible for managing access to your device accordingly.

5. Subscriptions & Payment

Certain features require payment. Ongoing access to paid features is offered through an Annual Subscription, described below. All billing, refunds, and cancellations are subject to Apple’s App Store terms and policies. We do not process payments or issue refunds directly — refund requests must go through Apple.

5a. Annual Subscription

• Ongoing access to paid features is offered through an annual subscription (“Subscription”), billed once per year through Apple’s App Store in-app purchase system.
• Subscriptions automatically renew at the end of each annual period unless canceled at least 24 hours before the renewal date, through your Apple ID account settings.
• Payment is charged to your Apple ID account at confirmation of purchase, and renewal payment is charged within 24 hours prior to the end of the current period.
• We may change Subscription pricing prospectively, with notice as required by Apple’s guidelines and applicable law. Any such change applies to future renewals only.
• Free trials, if offered, convert to a paid Subscription automatically unless canceled before the trial ends.
• Because Subscriptions are managed entirely through your Apple ID, they are independent of any Chronotype-specific profile or login — reinstalling the app or using it on a new device does not affect your Subscription status, which Apple manages via “Restore Purchases.”

5b. Fair-Use Limits on Interactive AI Features

• Your Subscription includes the automated home-screen coaching experience without a usage cap.
• The interactive, on-demand AI features — including voice conversations, AI chat, and AI-assisted meal and workout analysis — are subject to fair-use limits (for example, daily and monthly allowances). These limits exist to keep the Services responsive, available, and affordable for all users, and to protect against abuse, automated access, and excessive consumption that would degrade the experience for others.
• When a limit is reached, the affected AI feature is temporarily unavailable until the applicable period resets; your other features, including automated coaching and access to your data, remain available. Unused allowances do not roll over.
• We may set, change, or remove these limits, and the specific allowances, at any time and at our sole discretion, including to reflect changes in our own costs or the terms, pricing, or availability of the third-party providers on which these features depend (see Section 7). Where practical, we will reflect current allowances in the app or our support materials. Fair-use limits are not a guarantee of any minimum level of AI usage, and adjusting them is not a breach of these Terms and does not entitle you to a refund.

6. HealthKit & Health Data

• The Services request permission to read data from Apple HealthKit, which may include sleep analysis, heart rate, heart rate variability, step count, workouts, and related metrics.
• You control this access through the iOS permission prompts and at any time via iOS Settings → Privacy & Security → Health → Chronotype. Revoking access may disable or degrade core features.
• Your health data is used to power the coaching, scoring, and tier logic described in the app, and is shared with third-party service providers (including AI/LLM providers) strictly as described in our Privacy Policy, which is incorporated into these Terms by reference.
• We do not sell your health data, and we do not use your health data for advertising purposes.

7. Third-Party Services

The Services rely on and integrate with the following third-party providers. We do not control these third parties and are not responsible for their availability, accuracy, or errors; your use of these integrations may also be subject to the applicable third party’s own terms.

• AI/LLM Provider(s). For generating coaching messages, meal-photo analysis, and voice coaching. Text and vision-based coaching is routed through our own backend infrastructure before reaching our AI provider; live voice coaching connects your device directly to our AI provider’s real-time service using a short-lived access token issued by our backend.
• Nutrition Data Providers. One or more nutrition database providers, for barcode and food-label lookups. Nutrition data from these sources is displayed with any attribution their terms require.
• Weather Data Provider. A weather data provider, for weather context in coaching.
• Cloud Infrastructure Providers. For backend processing and the Agents catalog.

Dependency on third-party providers. Features that rely on these providers — including AI coaching and voice, meal-photo and barcode nutrition lookup, and weather context — exist only for as long as the applicable provider continues to make its service available to us on commercially acceptable terms. We do not control whether these providers continue operating, change or deprecate their models or interfaces, alter their own terms or usage policies, restrict or suspend our access, or increase their prices. If a third-party provider becomes unavailable, changes materially, restricts access, or increases costs, we may — without liability to you and without it constituting a breach of these Terms — modify, degrade, suspend, substitute, limit, or discontinue any dependent feature, in whole or in part. Any such change is not, by itself, grounds for a refund; refunds, where available, are handled by Apple under Section 5.

8. Agent Platform

Chronotype lets you discover and add Agents — configurable AI assistants built on our Agent Platform and provided by Chronotype.

• Agents generate content using AI for general wellness purposes. Like all AI-generated content, an Agent’s output may be incomplete, generic, or incorrect, and is subject to the disclaimers in Sections 3 and 14.
• An Agent only accesses the categories of your data that are disclosed at the time you enable it, and only after you affirmatively add it.
• You may remove any Agent at any time.
• We may add, remove, disable, or decline to make available any Agent at our sole discretion, including where a feature it relies on changes or becomes unavailable (see Section 7) or as required to comply with applicable law.

9. Acceptable Use

You agree not to, and not to assist or permit any third party to:

• Use the Services for any unlawful purpose, or to harass, abuse, or harm another person;
• Submit false, misleading, or manipulated health data with intent to defraud or manipulate coaching outcomes for yourself or others;
• Reverse-engineer, decompile, disassemble, or otherwise attempt to derive the source code, underlying algorithms, scoring logic, or prompts used by the Services;
• Systematically scrape, crawl, or query the Services (including via automated or bot access) to extract, replicate, or build a competing product from our coaching content, scoring outputs, or data structures;
• Circumvent, disable, or interfere with any subscription paywall, rate limit, or security feature;
• Upload or transmit malicious code, malware, phishing content, or unauthorized data collection tools;
• Impersonate any person or entity, or misrepresent your affiliation with any person or entity;
• Access or attempt to access another user’s data without authorization;
• Harass, abuse, or threaten our employees, contractors, or support staff;
• Use the Services in any manner that could disable, overburden, damage, or impair them, or at a volume or frequency inconsistent with normal individual use.

We reserve the right to investigate suspected violations and to suspend or terminate access to the Services for anyone engaged in prohibited conduct, without notice, at our sole discretion.

10. User Content

If you submit content to the Services (chat messages, meal photos, voice input, feedback, etc.) (“User Content”), you retain ownership of it, but grant us a worldwide, royalty-free, non-exclusive license to use, reproduce, process, and transmit that User Content (including to third-party AI providers) solely to operate, provide, and improve the Services. You represent that you have the rights necessary to submit your User Content.

11. Intellectual Property

The Services, including the Chronotype name, logo, app design, coaching algorithms, tier and scoring models, and all associated software, are owned by xCoefficient Inc. or its licensors and are protected by intellectual property laws. Subject to your compliance with these Terms, we grant you a limited, non-exclusive, non-transferable, revocable license to use the Services for your personal, non-commercial use. No other rights are granted.

12. Feedback

If you send us feedback, suggestions, or ideas about the Services, you agree we may use them for any purpose without compensation or attribution to you.

13. Termination

You may stop using the Services at any time. To clear your locally-stored data, use the “Delete All My Data” control in Profile → Privacy and/or delete the App from your device — because the Services do not use a server-side account (see Section 4), we have no independent ability to access or clear data stored on your device on your behalf, so this is a self-service action only you can take. You may also contact us at support@xcoefficient.com with any other questions about ending your use of the Services. We may suspend or terminate your access to the Services at any time, with or without cause or notice, including for violation of these Terms. Sections that by their nature should survive termination (including Sections 3, 6, 10–17) will survive.

14. Disclaimers

THE SERVICES, INCLUDING ALL AI-GENERATED CONTENT, ARE PROVIDED “AS IS” AND “AS AVAILABLE,” WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, OR ACCURACY. We do not warrant that the Services will be uninterrupted, error-free, or that any AI-generated coaching content will be accurate, complete, or suitable for your particular health circumstances.

15. Limitation of Liability & Indemnification

To the maximum extent permitted by law:

• Chronotype, its officers, employees, and affiliates will not be liable for any indirect, incidental, special, consequential, or punitive damages, or any loss of data, health outcomes, or profits, arising from your use of the Services.
• Our total aggregate liability for any claim arising out of or relating to the Services will not exceed the greater of (a) the amount you paid us in the 12 months before the claim arose, or (b) $100.

You agree to indemnify, defend, and hold harmless Chronotype and its officers, employees, and affiliates from any claims, damages, liabilities, and expenses (including attorneys’ fees) arising from: your use of the Services, your violation of these Terms, or your User Content.

16. Changes to the Services or These Terms

We may modify the Services or these Terms at any time. If we make material changes, we will provide notice (e.g., in-app notification or email) before the changes take effect. Continued use of the Services after changes take effect constitutes acceptance.

We may also suspend or discontinue the Services, or any individual feature, in whole or in part, at any time, with or without notice — including where a feature depends on a third-party provider that becomes unavailable, changes its service or terms, restricts our access, or increases its costs (see Section 7). We will not be liable for any loss, damage, or inconvenience resulting from your inability to access or use the Services or any feature as a result. Discontinuing or changing a feature for these reasons is not a breach of these Terms and does not, by itself, entitle you to a refund; refunds, where available, are handled by Apple.

17. Dispute Resolution — Binding Arbitration & Class Action Waiver

PLEASE READ THIS SECTION CAREFULLY — IT AFFECTS YOUR LEGAL RIGHTS.

• Informal Resolution First. Before either party files for arbitration, you and Chronotype agree to try to resolve the dispute informally by contacting the other party (Chronotype at support@xcoefficient.com) and negotiating in good faith for at least 30 days.
• Agreement to Arbitrate. If a dispute isn’t resolved informally, you and Chronotype agree that any dispute, claim, or controversy arising out of or relating to these Terms or the Services will be resolved by binding, individual arbitration administered by the American Arbitration Association (“AAA”) under its Commercial Arbitration Rules, with the arbitration seated in Cook County, Illinois, rather than in court, except that either party may bring an individual claim in small claims court.
• Exceptions to Arbitration. Notwithstanding the above, either party may bring a claim in court, without first arbitrating: (a) to seek injunctive or other equitable relief; or (b) for intellectual property infringement, misappropriation, or theft.
• Class Action Waiver. You and Chronotype agree that any arbitration conducted under this Section 17 will proceed only on an individual basis and not as a class, consolidated, or representative action. This Class Action Waiver applies only for so long as, and to the extent that, you remain bound by the Agreement to Arbitrate above. If you validly opt out of arbitration as described below, this Class Action Waiver no longer applies to you, and any dispute may instead be brought in court, individually or (if otherwise legally available) as part of a class, consolidated, or representative action.
• Opt-Out. You may opt out of the Agreement to Arbitrate and the Class Action Waiver together by emailing support@xcoefficient.com within 30 days of first accepting these Terms, stating your intent to opt out. If we materially change this Section 17 in the future, you will get a new 30-day opt-out window — measured from the date the revised Terms take effect — to opt out of the changed provisions specifically, even if you did not opt out (or missed your window) the first time. Opting out is permanent once made; it applies to this Section 17 as it exists at the time of your opt-out and to any later version unless you separately choose otherwise. Changes to other parts of these Terms that don’t affect this Section 17 do not reopen the window.
• Limitations Period. Any claim arising out of or relating to these Terms or the Services must be filed within one year after the claim arose, or it is permanently barred, to the extent permitted by applicable law.
• Governing Law. These Terms are governed by the laws of Illinois, without regard to conflict-of-law principles.

18. Apple App Store Acknowledgment

You acknowledge that these Terms are between you and Chronotype, not Apple, and Apple has no obligation to furnish maintenance or support for the Services. Apple is not responsible for addressing any claims relating to the Services, including product liability claims, claims that the Services fail to conform to legal or regulatory requirements, and claims arising under consumer protection law. In the event of any failure of the Services to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price, if any, for the app to you; to the maximum extent permitted by applicable law, Apple has no other warranty obligation whatsoever with respect to the Services, and any other claims, losses, liabilities, damages, costs, or expenses attributable to a failure to conform to any warranty will be Chronotype’s sole responsibility.

In the event of any third-party claim that the Services, or your possession and use of the Services, infringes that third party’s intellectual property rights, Chronotype, not Apple, is solely responsible for the investigation, defense, settlement, and discharge of any such claim.

You represent and warrant that you are not located in a country subject to a U.S. Government embargo or that has been designated by the U.S. Government as a “terrorist supporting” country, and that you are not listed on any U.S. Government list of prohibited or restricted parties.

Apple is a third-party beneficiary of these Terms and, upon your acceptance, will have the right to enforce them against you.

19. General

• Severability. If any provision of these Terms is found unenforceable, the remaining provisions remain in effect.
• No Waiver. Our failure to enforce a provision is not a waiver of our right to do so later.
• Assignment. You may not assign these Terms. We may assign them in connection with a merger, acquisition, or sale of assets.
• Electronic Communications. You consent to receive communications from us electronically (e.g., in-app notice or email), and agree that such communications satisfy any legal requirement that they be in writing. Where these Terms require your agreement or signature, an electronic action (such as tapping “I agree” or checking a box) satisfies that requirement.
• Entire Agreement. These Terms, together with the Privacy Policy, constitute the entire agreement between you and Chronotype regarding the Services.

20. Contact

xCoefficient Inc.
support@xcoefficient.com