OB Datum Terms of Use
Effective date: August 12, 2026
These Terms of Use ("Terms") are an agreement between you and VLR Software LLC ("VLR Software," "we," "us," or "our") governing your use of OB Datum: Pregnancy Dating (the "App"). By downloading or using the App, you agree to these Terms. If you do not agree, do not use the App.
These Terms supplement Apple's Standard Licensed Application End User License Agreement (the "Standard EULA"). If these Terms conflict with the Standard EULA, the Standard EULA controls to the extent of the conflict.
1. Intended use
OB Datum is a medical-reference and calculation aid for pregnancy dating. It performs deterministic date arithmetic from information you enter or explicitly import and presents calculation sources, equivalent dates, and comparisons for review.
The App does not diagnose, treat, prescribe, monitor a patient, select a delivery date, establish a standard of care, or replace professional judgment. Results are estimates, not guarantees of conception, gestational age, fetal development, or delivery date. You must verify inputs, results, and the applicable clinical methodology before relying on them.
OB Datum is not for emergencies. Contact local emergency services or an appropriate healthcare professional for urgent medical concerns.
2. Professional responsibility
Healthcare professionals remain solely responsible for clinical decisions, documentation, informed consent, regulatory compliance, and adherence to applicable institutional policies and current authoritative guidance. Patients and other consumers should review pregnancy-dating questions and results with a qualified healthcare professional.
Do not use the App as the sole basis for diagnosis, treatment, intervention timing, or a decision to change an established estimated due date. Reconciliation displays calendar-day differences but does not automatically apply redating thresholds or make a clinical decision.
3. Inputs, accuracy, and source material
The accuracy of a result depends on the accuracy and appropriateness of the information entered. Menstrual dates, conception or ovulation dates, ultrasound gestational age, embryo-transfer details, cycle assumptions, time zones, calendar conventions, and documentation errors can change a result.
We endeavor to test the calculation engine, but we do not warrant that every result, explanation, milestone, source link, or external publication is complete, current, or error-free. External methodology links are provided for review and convenience. Their publishers are not affiliated with or endorsed by VLR Software, and VLR Software does not control their content.
4. Not a patient record
OB Datum is not an electronic health record, medical record, clinical communication system, or HIPAA-compliant recordkeeping service. It intentionally provides no fields for patient names, record numbers, contact information, or clinical notes. You must not enter identifying patient information into shared content, support emails, calendar events, or any other part of the App.
You are responsible for determining whether using the App is permitted by your employer, institution, professional obligations, and applicable privacy and health-information laws.
5. Local storage and data loss
Saved cases are stored only on the device where they are created, are excluded from iCloud and device backups, and do not synchronize or automatically transfer to a replacement device. Deleting the App, erasing or losing the device, device failure, storage corruption, or certain system operations may permanently delete saved cases. VLR Software cannot recover them. Do not use saved cases as your sole or authoritative clinical record.
6. HealthKit and Calendar
HealthKit import is optional, read-only, and limited to a cycle-start sample you explicitly request to import. HealthKit data may be incomplete or inaccurate and must be independently verified. You may revoke access at any time through Apple Health or iOS Settings.
Calendar export opens Apple's event editor with a proposed estimated-due-date event. You are responsible for reviewing its date, title, notes, calendar, alerts, and privacy before saving it. VLR Software recommends that you do not add identifying patient information.
7. Lifetime Pro purchase
Lifetime Pro is a one-time, non-consumable in-app purchase that unlocks the Pro features associated with that product for the supported life of the App. It is not a subscription, does not transfer ownership of the App, and does not guarantee that every future feature, service, platform, or separately offered product will be included.
Apple processes payment, purchase approval, entitlement restoration, Family Sharing where available, and refunds under Apple's terms and regional policies. VLR Software does not receive your full payment details and cannot directly issue App Store refunds. Prices and availability are those displayed by Apple at the time of purchase. Pro access depends on valid App Store entitlement verification and compatible Apple services.
8. Privacy
Our handling of information is described in the OB Datum Privacy Policy, which is incorporated into these Terms. Use of HealthKit, iCloud, Calendar, StoreKit, and other Apple services is also subject to Apple's terms and privacy practices.
9. License and intellectual property
Subject to these Terms and the Standard EULA, VLR Software grants you a limited, personal, non-exclusive, non-transferable, revocable license to use the App on Apple-branded products you own or control as permitted by the App Store Usage Rules.
The App, including its software, design, name, graphics, original explanations, and other content, is owned by VLR Software or its licensors and is protected by applicable intellectual-property laws. Except where applicable law expressly permits otherwise, you may not copy, modify, distribute, sell, lease, sublicense, reverse engineer, defeat security controls, or attempt to derive the App's source code.
10. Acceptable use
You may not use the App to violate law, infringe another person's rights, expose confidential or identifying patient information, distribute malware, interfere with the App or Apple services, gain unauthorized access, misrepresent a calculation as a diagnosis or directive, or facilitate unsafe or unlawful conduct.
11. Availability, updates, and termination
We may update, add, modify, suspend, or discontinue features to improve the App or respond to clinical, security, platform, business, or legal requirements. Features may depend on a supported version of iOS or iPadOS, compatible hardware, HealthKit, iCloud, Calendar, StoreKit, network access, or regional availability and may not be available at all times.
You may stop using the App at any time. We may terminate the license if you materially violate these Terms. Provisions that by their nature should survive termination, including ownership, disclaimers, limitations of liability, and dispute provisions, will survive.
12. Disclaimers
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE APP IS PROVIDED "AS IS" AND "AS AVAILABLE," WITH ALL FAULTS AND WITHOUT WARRANTIES OF ANY KIND, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, QUIET ENJOYMENT, AND NON-INFRINGEMENT.
WE DO NOT WARRANT THAT CALCULATIONS, ESTIMATES, GESTATIONAL AGES, COMPARISONS, MILESTONES, SOURCE MATERIAL, SAVED CASES, HEALTH IMPORTS, CALENDAR EVENTS, PURCHASE ENTITLEMENTS, OR OTHER FEATURES WILL BE ACCURATE, COMPLETE, CURRENT, UNINTERRUPTED, SECURE, OR ERROR-FREE. YOUR NON-WAIVABLE CONSUMER RIGHTS REMAIN UNAFFECTED.
13. Limitation of liability
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, VLR SOFTWARE AND ITS MEMBERS, EMPLOYEES, LICENSORS, AND SERVICE PROVIDERS WILL NOT BE LIABLE FOR INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES; LOSS OF DATA, RECORDS, REVENUE, GOODWILL, OR OPPORTUNITY; CLINICAL, DOCUMENTATION, SCHEDULING, OR REGULATORY CONSEQUENCES; OR LOSSES ARISING FROM RELIANCE ON THE APP, ITS RESULTS, OR THIRD-PARTY OR APPLE SERVICES.
TO THE MAXIMUM EXTENT PERMITTED BY LAW, VLR SOFTWARE'S TOTAL LIABILITY FOR ALL CLAIMS RELATING TO THE APP WILL NOT EXCEED THE GREATER OF THE AMOUNT YOU PAID FOR THE APP DURING THE 12 MONTHS BEFORE THE EVENT GIVING RISE TO THE CLAIM OR US$10. Some jurisdictions do not allow certain exclusions or limitations, so some of the above may not apply to you.
14. Indemnification
To the extent permitted by applicable law, you agree to defend, indemnify, and hold VLR Software harmless from claims, losses, liabilities, and reasonable expenses arising from your unlawful use of the App, disclosure of information without authorization, infringement of another person's rights, or material violation of these Terms.
15. Governing law
These Terms are governed by the laws of the State of Wyoming, United States, without regard to conflict-of-laws principles, except that mandatory consumer protections in your place of residence continue to apply. The United Nations Convention on Contracts for the International Sale of Goods does not apply.
16. Apple
These Terms are between you and VLR Software, not Apple. Apple has no obligation to furnish maintenance or support for the App beyond obligations imposed by applicable law. To the extent permitted by law, Apple has no warranty obligation for the App. Apple is not responsible for addressing claims relating to the App or your possession and use of it, including product-liability, legal-compliance, or intellectual-property claims. Apple and its subsidiaries are third-party beneficiaries of these Terms and may enforce them against you upon your acceptance.
17. Changes to these Terms
We may revise these Terms. The updated version will be posted at this URL with a revised effective date. If a change is material, we will provide additional notice when reasonably appropriate. Continued use after revised Terms take effect constitutes acceptance where permitted by law.
18. Contact
VLR Software LLC<br /> support@vlrsoftware.com<br /> https://www.vlrsoftware.com