Last Updated: October 3, 2026
Welcome to Lune Line (the "App"), a private cycle-tracking, calendar-sharing, and communication service operated by Sexology Systems LLC ("Lune Line," "we," "us," or "our"). These Terms and Conditions (the "Terms") govern your access to and use of the App, related websites and subdomains, the Lune Line online store at shop.luneline.com, and all related features, content, products, and services (collectively, the "Services").
These Terms form a legally binding agreement between you ("User," "you," or "your") and Sexology Systems LLC. By creating an account, affirmatively accepting these Terms where an acceptance control is presented, downloading, accessing, or using the Services, you agree to these Terms and acknowledge our Privacy Policy. If you do not agree, do not use the Services.
Important: Lune Line provides cycle-tracking tools, estimates, reminders, sharing features, and communication tools. It is not a medical device and does not provide medical advice, diagnosis, treatment, contraception, or pregnancy prevention.
You must be at least 18 years old and legally capable of entering into these Terms. By using the Services, you represent and warrant that you satisfy these requirements.
Certain features require an account. You agree to provide information that is accurate enough to operate your account and to keep your authentication method under your control. We do not verify the identity, relationship, or intentions of every person who creates an account.
You are responsible for protecting your account credentials, third-party sign-in accounts, device, and any optional App PIN. You are responsible for activity occurring through your account unless prohibited by applicable law. Notify us promptly at support@luneline.com if you believe your account or device has been compromised.
You may lose access to your account or data if you lose access to your email address or third-party login provider, forget a device-only PIN, delete or reset the App before local information is synchronized, lose your device, violate these Terms, or if a technical failure occurs. You are responsible for maintaining separate copies of information that you cannot afford to lose. Lune Line is not intended to be your only permanent archive.
The Services may allow users to log period dates and related cycle information, view cycle days and estimated cycle stages, receive predicted period dates, receive reminders, and edit calendar information. Predictions and reminders are estimates generated from available information and may be inaccurate, incomplete, delayed, or unavailable.
The Services may allow a user to share calendar or cycle information with another Lune Line user. A user may provide a connection or invitation code to another person. The recipient may use the code to send an access request. The calendar owner can approve or decline that request. Access is not granted merely because someone possesses a code unless the App expressly states otherwise.
Sharing is voluntary and directional. Depending on the controls available, one user may share a calendar without necessarily receiving access to the other user's calendar. You can use the Manage screen or other available controls to stop sharing, stop viewing another person's calendar, or remove a connection.
Connected users may be able to communicate through chat and exchange text, emojis, images, files, audio messages, and other supported attachments. Chat is a convenience feature for private interpersonal communication; it is not an emergency communication service, medical service, or guaranteed delivery system.
The App may provide a "My Notes" channel intended for personal notes. "My Notes" is not intended to be visible to connected partners through normal App functionality. It is nevertheless stored and technically processed using third-party chat infrastructure and should not be treated as an offline vault, end-to-end encrypted notebook, or guaranteed permanent archive unless the App expressly states otherwise.
The optional App PIN is intended to help restrict access to the App on a particular device. It is not a substitute for securing your device or account. We do not receive or store the PIN in our account systems and cannot recover it for you. Logging out, resetting, or reinstalling the App may reset device-level PIN settings and may result in loss of locally stored or unsynchronized information.
Notifications may include period reminders, prompts to update tracking, sharing requests, connection activity, and chat alerts. Delivery depends on device settings, operating-system behavior, connectivity, provider availability, and other factors. We do not guarantee notification delivery, timing, or confidentiality on a device lock screen.
The Services may provide access to the Lune Line online store. Store purchases are subject to these Terms and any additional checkout, shipping, returns, refund, or product policies presented through the store.
We may add, modify, restrict, suspend, or discontinue features at any time. We do not guarantee that a particular feature, integration, provider, prediction model, communication channel, or store product will remain available indefinitely.
Cycle and calendar information can be sensitive. Before sharing, you are responsible for deciding whether you trust the recipient and whether sharing is appropriate for you. Do not provide your invitation or connection code to a person you do not want to be able to request access.
A request for access does not itself create a right to view another person's calendar. If you receive a request, review the requesting account before approving it. We cannot guarantee that a display name, email address, profile, or other account information corresponds to the identity you expect.
When you stop sharing or remove a connection, Lune Line will use the available controls to stop or limit future in-App access to the relevant shared calendar. This does not undo prior disclosure. A recipient may already have seen, remembered, copied, photographed, screenshotted, downloaded, forwarded, or otherwise retained information. We cannot force a recipient to delete copies outside our control.
You acknowledge that information you intentionally disclose to another user can be misused by that person. To the fullest extent permitted by law, Sexology Systems LLC is not responsible for a recipient's independent conduct outside our control, including disclosure, copying, harassment, coercion, surveillance, or other misuse of information that you chose to share. This does not limit rights that cannot legally be waived.
If another user shares cycle or calendar information with you, you agree to use that information only for lawful, personal purposes consistent with the person's consent. You must not use shared information to harass, threaten, coerce, stalk, discriminate against, exploit, embarrass, or harm that person, or to violate their privacy or other legal rights.
"User Content" means information or material you create, upload, store, send, or otherwise make available through the Services, including messages, "My Notes," images, files, audio messages, reactions, emojis, and other attachments. You retain ownership of User Content to the extent you own it.
You grant Sexology Systems LLC and our service providers a worldwide, non-exclusive, royalty-free license to host, store, reproduce, transmit, format, display, deliver, back up, and otherwise technically process User Content only as reasonably necessary to provide, secure, maintain, troubleshoot, and comply with legal obligations relating to the Services. This license does not transfer ownership of your User Content to us.
When you send User Content to another user, you intentionally make it available to that recipient. Recipients may save, copy, screenshot, download, forward, record, or redistribute content. Deleting a connection or deleting content in the App, where deletion is available, cannot guarantee that copies held by another person will disappear.
Lune Line uses Stream.io, Inc. ("Stream" or "GetStream") to provide chat and related messaging infrastructure. By using chat or "My Notes," you understand that chat-related User Content and metadata may be transmitted to, stored by, and processed through Stream and its authorized subprocessors on our behalf. Your use of these features is also subject to the technical availability and limitations of that provider.
You are responsible for files and attachments you send or open. Do not upload malware, malicious code, unlawful material, or content you do not have the right to share. We do not guarantee that every attachment is safe, available forever, compatible with your device, or free from corruption. Use reasonable caution before opening files from another user.
"My Notes" is intended to separate personal notes from partner conversations. It is not a promise of absolute secrecy, end-to-end encryption, permanent storage, or immunity from account compromise, legal process, provider failure, or security incidents. Keep independent copies of information you need to preserve.
You must not use the Services to:
We may investigate suspected abuse, restrict features, remove or disable access to content, suspend or terminate accounts, preserve relevant information, or cooperate with lawful authorities when we reasonably believe action is necessary to enforce these Terms, protect users or the Services, or comply with law. We do not undertake a general obligation to monitor all private communications.
Our collection and use of personal information is described in the Privacy Policy, which is incorporated into these Terms by reference.
We use Amplitude for limited product analytics about onboarding and selected feature usage. We configure our implementation so that cycle and health information, calendar content, chat messages, "My Notes," images, files, and audio messages are not intentionally sent to Amplitude. Technical analytics information may still include pseudonymous identifiers and device or app information as described in the Privacy Policy.
The Services provide informational tools, personal records, communication features, and estimates only. Lune Line does not provide medical advice, diagnosis, treatment, or professional healthcare services.
Cycle stages, fertile-window information, ovulation estimates, predicted period dates, and other cycle information may be inaccurate for many reasons. You must not rely on the Services as a method of contraception, pregnancy prevention, fertility determination, or medical decision-making.
A partner's ability to view cycle information does not make that person a healthcare professional and does not make shared information medically reliable. Lune Line does not verify or interpret communications between users.
The Services and chat are not emergency services. Do not use Lune Line to request urgent medical, law-enforcement, crisis, or emergency assistance. Contact appropriate local emergency services if immediate help is needed.
Purchases made through shop.luneline.com are subject to store-specific terms and policies presented at checkout, including shipping, returns, refunds, and product-specific terms. If store-specific terms conflict with these Terms regarding a purchase, the store-specific terms control for that transaction.
We try to present accurate product descriptions, images, prices, and availability, but do not warrant that every listing is complete, current, or error-free. We may correct errors, limit quantities, cancel orders where permitted, or discontinue products.
Products may be fulfilled by third-party suppliers and may ship separately. Delivery dates are estimates unless applicable law requires otherwise.
Returns and refunds are governed by the policies displayed through the store. Certain hygiene-related goods may be non-returnable once opened or used, subject to applicable law.
Payments may be processed by Shopify, app stores, banks, payment processors, or other providers. Their terms and privacy practices may apply to their independent services.
The App may offer paid features, subscriptions, or one-time purchases. Pricing, duration, renewal terms, trials, and other material purchase terms will be presented before purchase as required by the applicable platform. Purchases made through Apple or Google are also subject to that platform's billing and cancellation rules. Except where required by law or platform policy, fees are non-refundable.
The Services rely on third parties, which may include app stores, authentication providers, Stream/GetStream, Amplitude, Shopify, payment processors, hosting providers, push-notification services, and other technical providers. We do not control third-party outages, changes, independent privacy practices, or acts outside our reasonable control. Your use of third-party services may also be subject to their terms.
If you downloaded the App from Apple's App Store, you acknowledge that these Terms are between you and Sexology Systems LLC, not Apple. Apple is not responsible for the App or its content. Apple and its subsidiaries are third-party beneficiaries of these Terms to the extent required by Apple's applicable terms and may enforce the relevant provisions against you.
The App, software, interfaces, designs, branding, graphics, text, databases, features, and other materials provided by Sexology Systems LLC, excluding User Content and third-party materials, are owned by or licensed to Sexology Systems LLC and protected by applicable intellectual-property laws.
Subject to these Terms, we grant you a limited, personal, non-exclusive, non-transferable, revocable license to use the App and Services for lawful, non-commercial personal use.
If you voluntarily provide suggestions or feedback about the Services, you grant us the right to use that feedback without restriction or compensation, provided we do not thereby acquire ownership of unrelated personal User Content.
We use commercially reasonable safeguards, but no system can be guaranteed secure or uninterrupted. By using the Services, you acknowledge risks including account takeover, compromised third-party login accounts, device theft, malware, unauthorized device access, recipient misuse, software bugs, infrastructure failure, network attacks, provider outages, and security incidents affecting us or our service providers.
To the fullest extent permitted by law, we do not guarantee that the Services will be error-free, uninterrupted, free of harmful components, immune from unauthorized access, or capable of preserving every item of data indefinitely. If a security incident occurs, our obligations will be governed by applicable law and our Privacy Policy.
TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE SERVICES ARE PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED. THIS INCLUDES IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, NON-INFRINGEMENT, ACCURACY, RELIABILITY, AVAILABILITY, SECURITY, OR RESULTS, EXCEPT TO THE EXTENT SUCH WARRANTIES CANNOT LEGALLY BE DISCLAIMED.
We do not warrant that predictions will be accurate; that messages, files, reminders, or sharing requests will always be delivered; that another user is who you believe them to be; that another user will keep shared information confidential; or that deleted or revoked information cannot exist in copies outside our control.
TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, SEXOLOGY SYSTEMS LLC AND ITS AFFILIATES, OFFICERS, DIRECTORS, EMPLOYEES, CONTRACTORS, AND AGENTS WILL NOT BE LIABLE FOR INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR FOR LOSS OF PROFITS, REVENUE, DATA, USE, GOODWILL, OR OTHER INTANGIBLE LOSSES, ARISING FROM OR RELATING TO THE SERVICES.
TO THE FULLEST EXTENT PERMITTED BY LAW, WE ARE NOT LIABLE FOR THE INDEPENDENT ACTS OR OMISSIONS OF OTHER USERS OR THIRD-PARTY PROVIDERS OUTSIDE OUR REASONABLE CONTROL, INCLUDING A RECIPIENT'S USE OR DISCLOSURE OF INFORMATION YOU CHOOSE TO SHARE, SUBJECT TO RIGHTS AND REMEDIES THAT CANNOT LEGALLY BE WAIVED.
TO THE FULLEST EXTENT PERMITTED BY LAW, OUR TOTAL AGGREGATE LIABILITY FOR CLAIMS ARISING OUT OF OR RELATING TO THESE TERMS OR THE SERVICES WILL NOT EXCEED THE GREATER OF (A) THE AMOUNT YOU PAID DIRECTLY TO SEXOLOGY SYSTEMS LLC FOR THE SERVICES DURING THE SIX (6) MONTHS BEFORE THE EVENT GIVING RISE TO THE CLAIM OR (B) US $100. THIS LIMIT DOES NOT APPLY WHERE APPLICABLE LAW PROHIBITS SUCH A LIMITATION.
To the extent permitted by applicable law, you agree to indemnify and hold harmless Sexology Systems LLC and its affiliates, officers, directors, employees, contractors, licensors, and service providers from third-party claims, liabilities, losses, and reasonable costs arising out of or relating to (a) your unlawful use of the Services; (b) User Content you submit or share; (c) your violation of these Terms; or (d) your violation of another person's rights. This obligation does not require you to indemnify us for our own unlawful conduct where such indemnification is prohibited.
You may stop using the Services at any time and may delete your account through available App controls or by contacting support@luneline.com.
We may suspend, restrict, or terminate access when reasonably necessary to protect users or the Services, respond to legal requirements, address fraud or abuse, enforce these Terms, or discontinue the Services. Where appropriate and legally permitted, we may provide notice.
Upon termination, your right to use the Services ends. Account deletion or termination may result in loss of access to data. Residual information may remain temporarily in backups, logs, provider systems, or records retained for legal, fraud-prevention, dispute-resolution, or security purposes as described in the Privacy Policy. Information previously sent to or saved by another user may remain outside our control.
Before filing a formal claim, you and Sexology Systems LLC agree to make a good-faith effort to resolve the dispute by contacting support@luneline.com with enough information to understand the issue and requested relief.
Except for claims described in Section 16.4 and to the extent permitted by applicable law, unresolved disputes, claims, or controversies arising out of or relating to these Terms or the Services will be resolved by binding individual arbitration administered by JAMS under its applicable consumer rules. The Federal Arbitration Act governs the interpretation and enforcement of this arbitration agreement.
TO THE EXTENT PERMITTED BY APPLICABLE LAW, YOU AND SEXOLOGY SYSTEMS LLC AGREE TO BRING CLAIMS ONLY IN AN INDIVIDUAL CAPACITY AND NOT AS A PLAINTIFF OR CLASS MEMBER IN A PURPORTED CLASS, COLLECTIVE, CONSOLIDATED, OR REPRESENTATIVE ACTION.
Either party may bring an eligible individual claim in small claims court. Either party may also seek injunctive or equitable relief in a court of competent jurisdiction for intellectual-property infringement, unauthorized access, misuse of credentials, or other circumstances where such relief is legally available and arbitration is not required.
You may opt out of Sections 16.2 and 16.3 by emailing support@luneline.com within 30 days after you first accept these Terms. Your notice must state your name, the email associated with your Lune Line account, your city and state or country of residence, and that you are opting out of arbitration.
If you live outside the United States, or if applicable consumer law provides non-waivable rights, the arbitration and class-action provisions apply only to the extent permitted by law. Nothing in these Terms deprives you of protections that cannot lawfully be waived.
Except where applicable law requires otherwise, these Terms and disputes relating to them are governed by the laws of the State of Texas and applicable federal law, without regard to conflict-of-law rules. Any court proceeding not subject to arbitration will be brought in a court of competent jurisdiction, subject to mandatory consumer-law venue rights.
We may modify the Services from time to time. We may also update these Terms. If we make material changes to the Terms, we may provide notice in the App, by email, or by another appropriate method. If applicable law requires renewed consent, we will request it. Continued use after an effective date may constitute acceptance where legally permitted.
If a provision of these Terms is held invalid or unenforceable, it will be enforced to the maximum extent permitted and the remaining provisions will remain in effect.
Failure to enforce a provision is not a waiver of that provision or any other right.
You may not assign these Terms without our prior written consent. We may assign these Terms in connection with a merger, acquisition, financing, reorganization, sale of assets, or by operation of law, subject to applicable law.
These Terms, the Privacy Policy, and any additional terms expressly presented for a particular feature or purchase constitute the agreement between you and Sexology Systems LLC concerning the Services and supersede prior agreements on the same subject matter.
By creating an account and accepting these Terms when prompted, or by continuing to use the Services after becoming bound by an applicable version of these Terms, you acknowledge that you have read and understood these Terms and agree to them. If you do not agree, do not create an account or use the Services.