Last Updated: February 8, 2026
Welcome to Lune Line (the “App”), a mobile application designed to help users track their menstrual cycle, approximate ovulation dates, and related information. These Terms and Conditions (the “Terms”) govern your access to and use of Lune Line, including any related websites, subdomains, online services, features, content, products, or applications offered by or through the App, including our online store accessible at shop.luneline.com (collectively, the “Services”). By downloading, installing, accessing, or using Lune Line, you agree to be bound by these Terms. If you do not agree with these Terms, you must not use the App or the Services.
These Terms form a legally binding agreement between you (“User,” “you,” or “your”) and Sexology Systems LLC (“Lune Line,” “we,” “us,” or “our”). Please read these Terms carefully before using our App or Services.
Important: Lune Line helps you track menstrual cycle information and provides estimates and reminders. It is not a medical device and does not provide medical advice, diagnosis, or treatment. Do not rely on Lune Line for contraception, pregnancy prevention, or medical decision-making.
You must be at least 18 years of age (or the age of majority in your jurisdiction) to create an account and use Lune Line. By using our App, you represent and warrant that you meet these eligibility requirements. If you do not meet these requirements, you must not use the App or our Services.
To access certain features of the App and Services, you may be required to register an account. You agree to provide accurate, current, and complete information during the registration process, and to update such information to keep it accurate, current, and complete. You are responsible for maintaining the confidentiality of your account credentials and for all activities that occur under your account.
You are solely responsible for maintaining the security of your account username and password. You agree to notify us immediately at support@luneline.com if you suspect or become aware of any unauthorized use of your account or any other breach of security.
Lune Line is designed to help you track your menstrual cycles, approximate ovulation dates, store personal data related to your cycle history, and share this data with partners of your choice. All predictions within the App are approximate and are not intended for diagnosis or to replace professional medical advice. The App’s features may include:
We may add features over time, such as optional sharing of selected cycle information with a partner or a healthcare professional, or optional account-based syncing. If we add features, your use of them may be subject to additional terms, disclosures, or settings. Sharing will be optional and initiated by you.
Some features within Lune Line are experimental and may contain bugs or errors. These experimental features are provided on an “as is” basis, and their functionality or reliability is not guaranteed. By using these features, you acknowledge the inherent risks associated with experimental tools and agree to report any issues to us so we can improve them.
Certain features or content in the App may be offered as in‑app purchases on a one‑time or subscription basis. Pricing, duration, and renewal terms (if applicable) will be disclosed prior to purchase. You are responsible for managing any subscriptions through your app store account settings. Unless otherwise stated, all fees paid for in‑app purchases are non‑refundable.
We may display advertisements within the App, including ads for third‑party products or services. Such advertisements help us maintain and improve the App. Your interactions with any third‑party advertisers found in the App are solely between you and the advertiser. We do not endorse or assume responsibility for any third‑party advertisements or content.
We may modify, suspend, or discontinue any part of the Services at any time (including adding, removing, or changing features). We do not guarantee that any feature will always be available.
Lune Line does not provide medical advice, diagnosis, or treatment. You acknowledge and agree that the App’s predictions cannot guarantee prevention of pregnancy or any other health‑related outcome. You should always consult with a qualified healthcare provider before making decisions related to birth control, pregnancy, or any other medical condition.
Some parts of the Services may be usable without creating an account. Where we offer account-based features (for example, syncing or sharing), you agree to provide accurate information and keep your account credentials secure.
If you enable PIN protection, you are responsible for maintaining control of your device and PIN. We do not receive or store your PIN and cannot recover it for you. If you forget your PIN, you may need to reset the App on your device, which may result in loss of locally stored data.
Notifications depend on your device settings, connectivity, and permissions. We do not guarantee delivery or timing of notifications, and we are not responsible for missed notifications or any actions you take (or do not take) based on notifications.
The Services provide informational tools and estimates only. Lune Line does not provide medical advice, diagnosis, or treatment and is not a substitute for a qualified healthcare professional.
Predictions and fertility-related estimates (if shown) are approximate and may be inaccurate. You agree not to rely on the Services for contraception, pregnancy prevention, or to determine fertility or ovulation.
The Services are not for emergency use. If you think you may have a medical emergency, contact emergency services immediately.
You agree to use Lune Line and the Services in compliance with all applicable laws, regulations, and these Terms. You must not use the App in a manner that violates the rights of any person or infringes any third‑party rights.
Where applicable, if you post or transmit any content through the App (including messages, images, or other materials), you represent and warrant that you own or have the necessary rights to share such content, and that your content does not violate any third‑party rights, is not illegal, obscene, offensive, or otherwise objectionable.
If you choose to share any information through the Services, you do so voluntarily and at your discretion. You are responsible for choosing trusted recipients and for what you share. We are not responsible for how recipients use information after you share it.
Purchases made through shop.luneline.com are subject to additional terms presented at checkout and the store’s posted policies (including shipping, returns, and refunds). In the event of a conflict between these Terms and store-specific terms, the store-specific terms will govern purchases.
Product descriptions and images are provided for convenience. We try to display accurate information, but we do not guarantee that all descriptions, images, specifications, pricing, or availability are error-free. We may correct errors and update information at any time.
All products listed in the online store are subject to availability, and we reserve the right to impose quantity limits on any order, reject all or part of an order, and discontinue products or Services without prior notice.
By purchasing any products from our online store, shop.luneline.com, you agree to the store terms of sale provided at the time of purchase (including payment, shipping, returns, or warranties applicable to such products).
Shipping fees, delivery timelines, and fulfillment details may vary by product and supplier. Items may ship separately. Estimated delivery times are estimates only and are not guarantees.
Returns and refunds are governed by the return policy displayed on the store. Certain items (especially hygiene-related products) may be non-returnable if opened or used, as described in the store’s policies.
We may use third‑party payment processors to facilitate transactions in our online store. You agree to review and abide by such third‑party payment processors’ terms and policies.
The App may offer paid features, subscriptions, or one-time purchases now or in the future. If you purchase any paid feature through an app store, your purchase is processed by the applicable platform (for example, Apple or Google) and is subject to that platform’s billing terms. Unless required by law or platform policy, payments are non-refundable.
The Services may link to or integrate with third-party services (for example, ecommerce platforms, payment processors, shipping services, or external websites). We do not control third parties and are not responsible for their content, policies, or practices. Your use of third-party services is at your own risk and subject to their terms and policies.
If you downloaded the App from Apple’s App Store, you acknowledge that Apple and its subsidiaries are third-party beneficiaries of these Terms with respect to your use of the iOS version of the App and may enforce these Terms against you. Apple is not responsible for the App or its content.
All content, features, functionality, and designs offered through the App and the Services (excluding User Content) are owned by or licensed to Sexology Systems LLC and are protected by intellectual property laws. No right, title, or interest in or to the App, Services, or any content is transferred to you.
Subject to your compliance with these Terms, Sexology Systems LLC grants you a limited, non‑exclusive, non‑transferable, and revocable license to use the App on your personal devices and to access and use the Services for your personal, non‑commercial use.
If you submit any feedback, suggestions, or ideas regarding the App or Services, you acknowledge that we are free to use such feedback for any purpose, without any compensation to you.
YOUR USE OF THE APP AND SERVICES IS AT YOUR SOLE RISK. THE APP AND SERVICES ARE PROVIDED ON AN “AS IS” AND “AS AVAILABLE” BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO:
CERTAIN FEATURES OF THE APP ARE EXPERIMENTAL IN NATURE AND MAY CONTAIN BUGS OR ERRORS. SEXOLOGY SYSTEMS LLC DOES NOT WARRANT THAT ANY EXPERIMENTAL FEATURES WILL OPERATE WITHOUT INTERRUPTION OR ERROR. YOUR USE OF ANY EXPERIMENTAL FEATURES IS AT YOUR OWN RISK.
LUNE LINE DOES NOT PROVIDE MEDICAL ADVICE OR DIAGNOSIS, AND THE INFORMATION PROVIDED THROUGH THE APP OR SERVICES IS NOT A SUBSTITUTE FOR THE ADVICE OF A QUALIFIED MEDICAL PROFESSIONAL. RELYING ON THE INFORMATION OR TOOLS PROVIDED BY LUNE LINE MAY NOT PREVENT PREGNANCY OR ANY OTHER HEALTH OUTCOME. YOU SHOULD SEEK THE ADVICE OF A QUALIFIED HEALTHCARE PROVIDER WITH ANY QUESTIONS YOU MAY HAVE REGARDING PREGNANCY, BIRTH CONTROL, OR ANY OTHER MEDICAL CONDITION.
The App and Services may contain links to or integrate with content provided by third parties. We do not endorse, warrant, or assume responsibility for any third‑party websites, materials, products, or services. Any use of third‑party content or links is at your own risk.
TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL SEXOLOGY SYSTEMS LLC OR ITS AFFILIATES, DIRECTORS, OFFICERS, EMPLOYEES, OR AGENTS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING WITHOUT LIMITATION LOSS OF PROFITS, DATA, USE, GOODWILL, OR OTHER INTANGIBLE LOSSES, ARISING OUT OF OR RELATED TO YOUR USE OF OR INABILITY TO USE THE APP OR SERVICES.
TO THE FULLEST EXTENT PERMITTED BY LAW, OUR TOTAL LIABILITY FOR ANY CLAIMS ARISING OUT OF OR RELATING TO THESE TERMS, THE APP, OR THE SERVICES SHALL NOT EXCEED THE AMOUNT YOU PAID TO SEXOLOGY SYSTEMS LLC IN THE SIX (6) MONTHS PRIOR TO THE EVENT GIVING RISE TO THE CLAIM, OR ONE HUNDRED DOLLARS (US $100), WHICHEVER IS GREATER.
YOU AGREE THAT THE DISCLAIMERS, EXCLUSIONS, AND LIMITATIONS OF LIABILITY SET FORTH IN THESE TERMS ARE FUNDAMENTAL ELEMENTS OF THE BASIS OF THE BARGAIN BETWEEN YOU AND SEXOLOGY SYSTEMS LLC.
You agree to indemnify, defend, and hold harmless Sexology Systems LLC, its affiliates, licensors, and service providers, and each of their respective officers, directors, employees, contractors, agents, licensors, suppliers, successors, and assigns (collectively, the “Indemnified Parties”) from and against any and all claims, liabilities, damages, judgments, awards, losses, costs, expenses, or fees (including reasonable attorneys’ fees) arising out of or relating to:
You agree that the Indemnified Parties will have no liability in connection with any such claim or action, and you agree to hold them harmless from any related losses, liabilities, judgments, or expenses. Sexology Systems LLC reserves the right, at its own cost, to assume the exclusive defense and control of any matter otherwise subject to indemnification by you, and in such case, you agree to cooperate with our defense of such claim.
Before filing a claim, you agree to try to resolve the dispute informally by contacting us at support@luneline.com and providing: your name, contact information, a description of the issue, and the relief you are seeking. We will try to resolve disputes in good faith.
Except as stated in Section 13.4, if a dispute cannot be resolved informally, you and we 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, not in court.
The arbitration will be administered by JAMS under its applicable rules. The arbitrator may award any relief that a court could award on an individual basis. The arbitrator may not consolidate claims or preside over any form of class or representative proceeding.
You and we agree that disputes will be brought only in an individual capacity and not as a plaintiff or class member in any purported class, collective, consolidated, or representative action.
Either party may bring: (i) an individual action in small claims court (if eligible) in the county of your residence or Travis County, Texas; and (ii) claims for injunctive or equitable relief relating to intellectual property infringement or unauthorized access to the Services in a court of competent jurisdiction.
You may opt out of arbitration and the class action waiver by sending an email to support@luneline.com within 30 days of first accepting these Terms. Your email must include your name, your city and state of residence, and a clear statement that you are opting out of arbitration.
If you live outside the United States, mandatory arbitration and class action waivers may not apply to you to the extent prohibited by applicable law.
Unless otherwise required by law in your jurisdiction, the place of arbitration shall be Austin, Texas, and the language of the arbitration shall be English. The arbitrator’s decision shall be final and binding, and judgment on the award rendered by the arbitrator may be entered in any court of competent jurisdiction.
Notwithstanding the above, you and Sexology Systems LLC each retain the right to seek injunctive or other equitable relief in a court of competent jurisdiction for any claim related to intellectual property rights or unauthorized use of the App or Services.
Except where prohibited by applicable law, these Terms and any dispute or claim arising out of or relating to these Terms, their subject matter, or their formation (including non‑contractual disputes or claims), shall be governed by and construed in accordance with the laws of the State of Texas and the federal laws of the United States, without giving effect to any conflict‑of‑law principles that may provide for the application of the law of another jurisdiction.
You may stop using the App and Services at any time and for any reason. You may also delete your account at your discretion by following the instructions provided in the App or contacting us at support@luneline.com.
We reserve the right to suspend, deactivate, or terminate your account or your access to the App or Services at any time, for any reason, including any violation of these Terms. We will make reasonable efforts to notify you if we do so.
Upon termination of your account, your right to use the App and the Services will immediately cease. The provisions of these Terms that by their nature should survive termination shall remain in full force and effect, including, without limitation, ownership provisions, warranty disclaimers, indemnities, and limitations of liability.
16.1 Modifications to the Services — We reserve the right to modify, suspend, or discontinue the App or any part of the Services at any time, with or without notice. This includes the addition or removal of experimental features, in‑app purchase options, or advertisements. We are not liable to you or any third party for any modification, suspension, or discontinuation of the App or Services.
16.2 Modifications to the Terms — We may amend these Terms from time to time. If we make material changes, we will provide notice (for example, by email or by posting a prominent notice within the App). By continuing to use the App or Services after the updated Terms become effective, you agree to be bound by the revised Terms.
Your use of the App and our Services is also governed by our Privacy Policy, which is hereby incorporated by reference. We collect, use, and share your personal data according to that policy. Please review it carefully before using the App or the Services. By using the App, you consent to the collection and use of your personal data in accordance with the Privacy Policy.
If any provision of these Terms is found by a court of competent jurisdiction or an arbitrator to be invalid, illegal, or unenforceable, such provision shall be severed and the remainder of these Terms shall remain in full force and effect. The invalid, illegal, or unenforceable provision shall be deemed modified so that it is valid and enforceable to the maximum extent permitted by law.
These Terms, together with any additional policies or documents expressly incorporated by reference, constitute the entire agreement and understanding between you and Sexology Systems LLC concerning the subject matter herein and supersede all prior and contemporaneous agreements, understandings, or representations, whether written or oral.
No waiver of any term or condition of these Terms by Sexology Systems LLC shall be deemed a further or continuing waiver of such term or condition or a waiver of any other term or condition. Any failure to assert a right or provision under these Terms shall not constitute a waiver of such right or provision.
You may not assign or transfer these Terms, in whole or in part, without our prior written consent. Sexology Systems LLC may assign or transfer these Terms, in whole or in part, at any time without notice or consent.
By creating an account, downloading, installing, or using the App or the Services, you acknowledge that you have read and understood these Terms, and you agree to be bound by them. If you do not agree, you must not use the App or the Services.
Thank you for choosing Lune Line!