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Terms of Service

Effective Date: March 14, 2026

These Terms of Service ("Terms") constitute a legally binding agreement between you ("User," "you," or "your") and Felix Culpa Publishing, LLC ("Company," "we," "us," or "our"), governing your access to and use of the Fastara mobile application, version 1.0.0 and all subsequent updates ("App"), available on the iOS platform. By downloading, installing, accessing, or using the App, you acknowledge that you have read, understood, and agree to be bound by these Terms and our Privacy Policy, which is incorporated herein by reference.

If you do not agree to these Terms, you must immediately cease all use of the App and delete it from your device.

1. Company Information

The App is published and maintained by Felix Culpa Publishing, LLC. All references to "Fastara," "we," "us," or "our" in these Terms refer to Felix Culpa Publishing, LLC. For any questions or concerns regarding these Terms, you may contact us at support@fastara.app.

Governing legal documents for the App are published at the following URLs:

2. Eligibility and Age Restrictions

The App is rated 17+ on the Apple App Store and is intended exclusively for adult users. Given the health-related nature of the App — including intermittent fasting protocols, menstrual cycle tracking, and exercise recommendations — the App is not designed for, marketed to, or intended for use by individuals under the age of seventeen (17).

By using the App, you represent and warrant that you are at least seventeen (17) years of age. If you are under 17, you may not download, install, or use the App. We do not knowingly collect information from individuals under 17. If we learn that a user is under 17, we reserve the right to terminate access to the App immediately.

3. Description of the App and Services

3.1 App Overview

Fastara is a cycle-synced intermittent fasting application for iOS (iPhone) that provides personalized fasting guidance synchronized with the user's menstrual cycle. The App offers tools and information related to intermittent fasting, menstrual cycle tracking, symptom logging, exercise guidance, nutritional education, and wellness analytics.

3.2 Core Features

The App provides the following features:

  • Cycle Tracking: Users input their last period start date, cycle length (configurable between 21–40 days), and period length (configurable between 2–10 days). The App calculates the user's current cycle phase — Menstrual, Follicular, Ovulatory, or Luteal — based on this information.
  • Fasting Timer: Users can start and stop intermittent fasting sessions with recommended fasting windows based on their current cycle phase (e.g., 16:8 during the follicular phase, 12:12 during the luteal phase). The timer includes real-time progress tracking.
  • Symptom Tracking: Users may log daily symptoms — including energy, mood, cramps, bloating, headache, sleep quality, cravings, and focus — rated on a numeric scale with optional free-text notes. Each entry is associated with the user's cycle day and phase.
  • Exercise Recommendations: Phase-specific workout suggestions tailored to the user's current cycle phase and energy level.
  • Educational Content: A library of articles and a hormone guide covering hormonal physiology, fasting science, cycle biology, and wellness information.
  • Insights & Analytics: Symptom trend analysis and fasting statistics over time, including average duration, completion rate, and streak tracking.
  • Share Cards: Shareable cycle summary cards that users can generate for partners and loved ones.
  • Smart Notifications: Locally scheduled notifications including fasting reminders, period prediction alerts, and fasting completion notifications. These are generated entirely on the user's device.
  • Home Screen Widget: A widget displaying current cycle and fasting status, powered by data shared through Apple's App Groups framework (identifier: group.app.rork.fastara) — on-device only.
  • Data Export: Users may export all their data as a JSON file.
  • Data Deletion: Users may permanently and irreversibly delete all their data from within the App.

3.3 Local Data Storage

All personal health data entered into the App is stored locally on your device using Apple's UserDefaults framework. Specifically, the App stores:

  • Last period start date, cycle length, and period length;
  • Fasting session history (start/end times, target hours, associated cycle phase);
  • Symptom logs (symptom type, rating, notes, date, cycle day, and phase);
  • Notification preferences (reminder times and toggle states);
  • Onboarding completion status;
  • App review prompt tracking data (completed fasts count and last prompt date).

The App does not transmit, upload, or store your personal health data on any external server, cloud service, or remote database. There is no server-side account system or cloud database for user health data. You are solely responsible for maintaining the security of your device and backing up your data.

3.4 No Account Required

The App does not require account creation, login, email registration, or any form of user authentication. You may begin using the App immediately upon download without providing personally identifiable information.

3.5 Accuracy of Cycle Phase Calculations

Cycle phase calculations are estimates based on user-provided data. The App calculates your current cycle phase using the information you enter (last period start date, cycle length, and period length). These calculations are approximations and may not reflect your actual hormonal status at any given time. The App cannot guarantee the accuracy of phase predictions, period forecasts, or any related calculations. Variations in cycle length, irregular cycles, and other physiological factors may cause the App's estimates to differ from your actual experience.

4. Medical Disclaimer and Assumption of Risk

4.1 Not Medical Advice

THE APP IS A WELLNESS AND INFORMATIONAL TOOL ONLY. IT IS NOT A MEDICAL DEVICE, AND NOTHING CONTAINED IN THE APP CONSTITUTES MEDICAL ADVICE, DIAGNOSIS, OR TREATMENT. THE APP DOES NOT DIAGNOSE, TREAT, CURE, OR PREVENT ANY DISEASE OR MEDICAL CONDITION.

All content provided through the App — including but not limited to fasting schedules, cycle-phase recommendations, nutritional guidance, personalized meal plans, exercise suggestions, and educational articles — is intended for general informational and educational purposes only. The App does not replace the advice, diagnosis, or treatment of a licensed physician or qualified healthcare provider.

4.2 In-App Disclaimer

The following disclaimer is displayed within the App and is incorporated into these Terms:

"This app provides general wellness guidance based on hormonal physiology and current research. Recommendations are based on biological plausibility and expert guidance — cycle-synced fasting has not yet been validated in randomized clinical trials. Individual responses vary. This is not medical advice. Always consult a healthcare provider before making significant changes to your diet or fasting routine."

4.3 No Guarantee of Results

The App makes no representations, warranties, or guarantees — express or implied — regarding the effectiveness, safety, or suitability of any fasting protocol, exercise routine, meal plan, nutritional recommendation, or wellness suggestion provided through the App. Individual results may vary significantly. Your health outcomes depend on numerous factors beyond the scope of this App, including but not limited to your existing medical conditions, medications, genetics, lifestyle, and adherence to professional medical guidance.

4.4 Scientific References and Limitations

The App references published scientific studies to provide context for its recommendations. Key sources include, but are not limited to:

  • BioCycle Study (Yeung et al., Journal of Clinical Endocrinology & Metabolism): Research on estrogen and insulin sensitivity across the menstrual cycle;
  • Benton et al. 2020 (PLOS ONE): Meta-analysis of luteal phase metabolic rate;
  • Cienfuegos et al. 2022 (PMC9182756): Research on intermittent fasting and female reproductive hormones;
  • Webb 1986 and Solomon et al. 1982: Early resting metabolic rate studies across cycle phases.

These citations are provided for informational purposes only and do not constitute endorsement of any specific health outcome.

IMPORTANT: The concept of cycle-synced fasting as implemented in the App has not been validated through randomized controlled clinical trials. The App's cycle-phase fasting recommendations are based on biological plausibility derived from existing research on hormonal fluctuations and metabolic responses — not on direct clinical evidence establishing efficacy. Users should understand and accept this limitation before relying on the App's recommendations.

4.5 Contraindicated Populations

The App is not suitable for individuals who:

  • Have a current or past history of eating disorders (including but not limited to anorexia nervosa, bulimia nervosa, or binge eating disorder);
  • Are pregnant or breastfeeding;
  • Have been diagnosed with diabetes (Type 1 or Type 2) or other metabolic conditions;
  • Have been diagnosed with hormonal disorders, thyroid conditions, or adrenal insufficiency;
  • Are taking medications that require food intake at specific intervals;
  • Are managing any health condition that may be adversely affected by caloric restriction or fasting.

If you fall within any of the above categories, do not use the App without first obtaining express written approval from your physician. The Company disclaims all liability for any adverse health effects experienced by individuals in contraindicated populations who use the App without appropriate medical supervision.

4.6 Consult Your Healthcare Provider

You should always consult your physician or other qualified healthcare provider before beginning any fasting protocol, exercise program, or dietary change — particularly if you have any pre-existing medical condition. If you experience dizziness, fainting, chest pain, difficulty breathing, or any other adverse symptoms while using the App, discontinue use immediately and seek medical attention.

4.7 Assumption of Risk

By using the App, you expressly acknowledge and agree that you assume full responsibility for any risks associated with fasting, exercise, and dietary modification. You voluntarily use the App at your own risk and agree that the Company shall not be liable for any injury, illness, or adverse health outcome resulting from your use of the App or reliance on its content.

5. Subscription Terms and In-App Purchases

5.1 Free Tier

The App provides core functionality at no charge, including basic cycle tracking, the fasting timer, and limited access to the educational content library.

5.2 Fastara Premium

Fastara Premium is an optional auto-renewable subscription that unlocks additional features, including but not limited to:

  • Symptom trend analysis and detailed trend charts;
  • Full fasting analytics (average duration, completion rate, longest streak);
  • All-phase exercise recommendations and workouts;
  • Partner sharing cards;
  • Personalized meal plans;
  • Smart reminders (fasting alerts, period predictions, completion notifications);
  • Premium educational articles and full access to the article library.

Premium features require an active subscription. If your subscription expires or is canceled, access to Premium features will revert to the free tier at the end of the current billing period.

5.3 Subscription Plans

Fastara Premium is available in the following subscription tiers:

  • Monthly: Auto-renewing monthly subscription;
  • Annual: Auto-renewing annual subscription.

Pricing for each tier is set in Apple's App Store Connect and displayed to you in your local currency via Apple's StoreKit localized pricing at the time of purchase.

5.4 Subscription Management via Apple and RevenueCat

All subscription transactions are processed through the Apple App Store and managed by RevenueCat, Inc., our third-party subscription management platform (entitlement: "premium"). By subscribing to Fastara Premium, you agree to the following:

  • Payment: Payment is charged to your Apple ID account at confirmation of purchase.
  • Auto-Renewal: Subscriptions automatically renew unless auto-renewal is turned off at least twenty-four (24) hours before the end of the current billing period. Your Apple ID account will be charged for renewal within twenty-four (24) hours prior to the end of the current period at the then-current subscription rate.
  • Managing Subscriptions: You may manage or cancel your subscription at any time through your Apple ID account settings (Settings > [Your Name] > Subscriptions) on your Apple device. The Company cannot process cancellations, refunds, or billing adjustments directly.
  • Restore Purchases: The App provides a restore purchases feature that allows you to restore your active subscription on the same or a different device linked to the same Apple ID.
  • Free Trials: If a free trial is offered, any unused portion of the trial period will be forfeited upon purchase of a Premium subscription.
  • Price Changes: We reserve the right to modify subscription pricing at any time. Any price increase will take effect at the start of your next billing period following notice from Apple in accordance with App Store policies.
  • Refunds: All refund requests must be directed to Apple in accordance with the App Store's refund policies. The Company does not process refunds directly.

RevenueCat processes subscription data using an anonymous app user identifier and Apple purchase receipts. RevenueCat does not receive your name, email address, or any health data. For more information, see RevenueCat's Privacy Policy.

6. User Data, Export, and Deletion

6.1 Data Ownership

You own all personal health data you enter into the App. The Company does not claim any ownership interest in your data. Because all data is stored locally on your device, you maintain full control over your information at all times.

6.2 Data Export

The App provides a JSON data export feature that allows you to export all of your personal data stored within the App. Exported data is saved to your device in JSON format. The Company does not retain copies of exported data.

6.3 Permanent Data Deletion

The App provides a permanent data deletion feature that irrevocably erases all personal data stored locally on your device by the App. This action cannot be undone. Once you initiate permanent deletion, all cycle data, fasting history, symptom logs, preferences, and any other information stored by the App will be permanently destroyed. The Company cannot recover deleted data under any circumstances.

6.4 Data Loss

Because all data is stored locally on your device and there is no cloud backup or server-side storage, the Company is not responsible for any data loss resulting from device malfunction, loss, theft, damage, operating system updates, App deletion, App updates, or any other cause. You are solely responsible for backing up your data using the App's export feature or other means. Your data does not sync across devices.

7. Third-Party Services

The App integrates with or utilizes the following third-party services:

Service Purpose Data Shared
RevenueCat Subscription management Anonymous app user ID, purchase receipts
Apple StoreKit In-app purchases & review prompts Payment via Apple ID
Apple Notifications (APNs) Local push notifications None sent to servers (all scheduled locally)
Apple WidgetKit Home screen widgets Cycle/fasting data via on-device App Group (group.app.rork.fastara)

No analytics or tracking SDKs are included in the App. RevenueCat is the only third-party SDK integrated into the App, and it is used solely for subscription management.

The Company is not responsible for the practices, policies, content, or availability of any third-party services. Your use of third-party services is governed by their respective terms and privacy policies. The inclusion of any third-party integration does not constitute endorsement by the Company.

8. Notifications and Permissions

8.1 Local Notifications

The App may send local notifications to your device, including:

  • Fasting reminders (start and end of fasting windows);
  • Period prediction alerts;
  • Fasting completion notifications.

All notifications are generated and scheduled entirely on your device using Apple's local notification system. The App does not use any remote push notification server, and no notification data is transmitted externally. Notification permission is requested at runtime with your consent. You may disable notifications at any time through your device's system settings (Settings > Notifications > Fastara).

8.2 App Store Review Prompts

The App uses Apple's StoreKit framework to occasionally prompt you to rate and review the App in the App Store. These prompts are triggered based on usage milestones (e.g., number of completed fasts) and are governed by Apple's system-level rate-limiting policies. The App tracks completed fasts count and last prompt date locally for this purpose. No personal data is collected or transmitted through this feature.

8.3 Permissions Summary

The only runtime permission requested by the App is Notifications — for fasting reminders, period prediction alerts, and fasting completion notifications. This permission is requested with your consent and can be revoked at any time in your device settings.

9. User Conduct and Responsibilities

By using the App, you agree to the following:

  • You will use the App solely for its intended purpose as a personal health and wellness tool;
  • You will provide accurate information when logging cycle data, fasting periods, symptoms, and other health information, and you acknowledge that the accuracy of the App's recommendations depends on the accuracy of the data you provide;
  • You will not rely on the App as a substitute for professional medical advice, diagnosis, or treatment;
  • You should consult healthcare providers before changing your diet or fasting routine, especially if you are pregnant, breastfeeding, or managing any health condition;
  • You will not attempt to reverse engineer, decompile, disassemble, or otherwise derive the source code of the App;
  • You will not reproduce, distribute, sublicense, sell, or otherwise transfer the App or any of its content to any third party;
  • You will not use the App for any unlawful purpose or in violation of any applicable local, state, national, or international law or regulation;
  • You will not attempt to circumvent, disable, or interfere with any security features, access controls, subscription restrictions, or usage limitations of the App.

10. Intellectual Property

The App, including but not limited to its source code, object code, user interface, design, graphics, logos, icons, images, text, educational articles, hormone guides, algorithms, fasting protocols, meal plans, exercise recommendations, and all other content and materials ("App Content"), is the exclusive property of Felix Culpa Publishing, LLC and is protected by United States and international copyright, trademark, trade secret, and other intellectual property laws.

You are granted a limited, non-exclusive, non-transferable, revocable license to use the App for personal, non-commercial purposes in accordance with these Terms. This license does not grant you any right, title, or interest in the App Content beyond what is expressly stated herein. All rights not expressly granted are reserved by the Company.

The Fastara name, logo, and all related marks are trademarks of Felix Culpa Publishing, LLC. You may not use any Company trademarks without prior written consent.

11. Disclaimer of Warranties

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE APP IS PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE. THE COMPANY EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND ANY WARRANTIES ARISING FROM COURSE OF DEALING, USAGE, OR TRADE PRACTICE.

Without limiting the foregoing, the Company does not warrant that:

  • The App will meet your specific requirements or expectations;
  • The App will be uninterrupted, timely, secure, or error-free;
  • The results obtained from use of the App will be accurate, reliable, or complete;
  • Cycle phase predictions, period forecasts, or fasting window recommendations will be accurate for your individual physiology;
  • Any health, wellness, fasting, nutritional, or exercise information provided through the App will be suitable for your individual circumstances;
  • Any defects in the App will be corrected.

12. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL FELIX CULPA PUBLISHING, LLC, ITS MEMBERS, MANAGERS, OFFICERS, EMPLOYEES, AGENTS, AFFILIATES, OR LICENSORS BE LIABLE FOR ANY OF THE FOLLOWING ARISING OUT OF OR IN CONNECTION WITH YOUR USE OF, OR INABILITY TO USE, THE APP:

  • Any indirect, incidental, special, consequential, exemplary, or punitive damages;
  • Any loss of profits, revenue, data, goodwill, or other intangible losses;
  • Any personal injury or adverse health effects resulting from your reliance on information provided by the App, including fasting protocols, exercise recommendations, meal plans, or nutritional guidance;
  • Any loss of data resulting from device malfunction, App deletion, operating system updates, or use of the permanent data deletion feature;
  • Any damages resulting from inaccurate cycle phase calculations or period predictions;
  • Any damages resulting from unauthorized access to or alteration of your device or data;
  • Any damages resulting from the conduct of any third party in connection with the App.

THE COMPANY'S TOTAL AGGREGATE LIABILITY TO YOU FOR ALL CLAIMS ARISING UNDER OR IN CONNECTION WITH THESE TERMS OR YOUR USE OF THE APP SHALL NOT EXCEED THE GREATER OF: (A) THE TOTAL AMOUNT YOU HAVE PAID TO THE COMPANY FOR THE APP IN THE TWELVE (12) MONTHS IMMEDIATELY PRECEDING THE EVENT GIVING RISE TO THE CLAIM, OR (B) FIFTY UNITED STATES DOLLARS (USD $50.00).

The limitations set forth in this section shall apply regardless of the legal theory upon which the claim is based, whether in contract, tort (including negligence), strict liability, or otherwise, and regardless of whether the Company has been advised of the possibility of such damages.

13. Indemnification

You agree to indemnify, defend, and hold harmless Felix Culpa Publishing, LLC, its members, managers, officers, employees, agents, and affiliates from and against any and all claims, liabilities, damages, losses, costs, and expenses (including reasonable attorneys' fees and court costs) arising out of or related to:

  • Your use of or inability to use the App;
  • Your violation of these Terms;
  • Your violation of any applicable law, regulation, or third-party right;
  • Any health-related claim arising from your use of the App's fasting protocols, exercise recommendations, meal plans, or nutritional guidance;
  • Any claim by a third party related to your use of the App.

14. Modifications to the App and Terms

14.1 Modifications to the App

The Company reserves the right to modify, update, suspend, or discontinue the App (or any part thereof) at any time, with or without notice, and without liability to you. We may add, remove, or change features, functionality, content, or subscription offerings at our sole discretion. Continued use of the App following any modifications constitutes your acceptance of such changes.

14.2 Modifications to Terms

The Company reserves the right to modify these Terms at any time. Material changes will be communicated by updating the "Effective Date" at the top of this page and, where practicable, through notice within the App. Your continued use of the App after the effective date of any revised Terms constitutes your acceptance of and agreement to the revised Terms. If you do not agree to the revised Terms, you must cease using the App and delete it from your device.

15. Termination

The Company may terminate or suspend your access to the App at any time, with or without cause, and with or without notice, including for misuse of the App or violation of these Terms. Upon termination, your license to use the App is immediately revoked. Sections 4 (Medical Disclaimer), 6.4 (Data Loss), 10 (Intellectual Property), 11 (Disclaimer of Warranties), 12 (Limitation of Liability), 13 (Indemnification), and 17 (Governing Law) shall survive any termination of these Terms.

You may terminate these Terms at any time by deleting the App from your device and ceasing all use. If you hold an active Premium subscription, you must also cancel your subscription through your Apple ID account settings to prevent further charges. Deleting the App does not automatically cancel your subscription.

16. Apple App Store Terms

The following additional terms apply to your use of the App as downloaded from the Apple App Store:

  • These Terms are between you and Felix Culpa Publishing, LLC only — not with Apple Inc. ("Apple"). The Company, not Apple, is solely responsible for the App and its content.
  • Your use of the App must comply with the App Store Terms of Service.
  • The Company, not Apple, is responsible for addressing any claims relating to the App, including but not limited to product liability claims, claims that the App fails to conform to any applicable legal or regulatory requirement, and claims arising under consumer protection or similar legislation.
  • In the event of any third-party claim that the App or your possession and use of the App infringes a third party's intellectual property rights, the Company — not Apple — shall be solely responsible for the investigation, defense, settlement, and discharge of such claim.
  • Apple and its subsidiaries are third-party beneficiaries of these Terms. Upon your acceptance of these Terms, Apple will have the right (and will be deemed to have accepted the right) to enforce these Terms against you as a third-party beneficiary.

17. Governing Law and Dispute Resolution

These Terms shall be governed by and construed in accordance with the laws of the State in which Felix Culpa Publishing, LLC is organized, without regard to its conflict of law provisions.

Any dispute, claim, or controversy arising out of or relating to these Terms or the use of the App shall first be attempted to be resolved through good-faith informal negotiation. If informal negotiation does not resolve the dispute within thirty (30) days, either party may pursue resolution through binding arbitration administered in accordance with the rules of the American Arbitration Association, or through litigation in the state or federal courts of competent jurisdiction.

CLASS ACTION WAIVER: TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, YOU AGREE THAT ANY DISPUTE RESOLUTION PROCEEDING WILL BE CONDUCTED ONLY ON AN INDIVIDUAL BASIS AND NOT IN A CLASS, CONSOLIDATED, OR REPRESENTATIVE ACTION. IF FOR ANY REASON A CLAIM PROCEEDS IN COURT RATHER THAN IN ARBITRATION, YOU WAIVE ANY RIGHT TO A JURY TRIAL.

18. Severability

If any provision of these Terms is held to be invalid, illegal, or unenforceable by a court of competent jurisdiction, such provision shall be modified to the minimum extent necessary to make it valid and enforceable, or if modification is not possible, shall be severed from these Terms. The invalidity or unenforceability of any provision shall not affect the validity or enforceability of the remaining provisions, which shall continue in full force and effect.

19. Entire Agreement

These Terms, together with the Privacy Policy, constitute the entire agreement between you and Felix Culpa Publishing, LLC regarding your use of the App, and supersede all prior and contemporaneous agreements, proposals, representations, and understandings, whether written or oral, relating to the subject matter hereof.

20. Waiver

The failure of the Company to enforce any right or provision of these Terms shall not constitute a waiver of such right or provision. No waiver of any term or condition shall be deemed a further or continuing waiver of such term or condition or any other term or condition.

21. Assignment

You may not assign or transfer these Terms or your rights hereunder, in whole or in part, without the prior written consent of the Company. The Company may assign these Terms, in whole or in part, at any time without notice or consent. These Terms shall be binding upon and inure to the benefit of the parties and their respective successors and permitted assigns.

22. Contact Information

If you have any questions, concerns, or feedback regarding these Terms of Service, please contact us at:

Felix Culpa Publishing, LLC
Email: support@fastara.app
Website: https://fastara.app