End User License Agreement (EULA) & Terms of Use

Effective Date: September 26, 2026 | Last Updated: September 26, 2026

CRITICAL NOTICE: NOT A CONTRACEPTIVE DEVICE OR METHOD

PLEASE READ THIS SECTION WITH UTMOST ATTENTION BEFORE DOWNLOADING, ACCESSING, OR USING CYCLECIPHER:

1. NOT FOR BIRTH CONTROL: CycleCipher is NEVER to be used as a contraceptive method, form of birth control, or tool for family planning to prevent pregnancy. CycleCipher is NOT a certified medical device, is NOT evaluated or approved by the European Medicines Agency (EMA), the U.S. Food and Drug Administration (FDA), or any other regulatory health authority for contraception.

2. STATISTICAL APPROXIMATIONS ONLY: All projected dates—including next cycle onset, predicted ovulation dates, and fertile window indicators—are mathematical estimates and statistical probabilities based solely on user-entered historical data. Human biology is inherently irregular: ovulation can vary unpredictably due to stress, illness, medication, travel, diet, hormonal fluctuations, and age. Viable sperm can survive inside the female reproductive tract for up to five (5) days or longer. Consequently, pregnancy can occur from sexual intercourse on any day of the menstrual cycle.

3. ABSOLUTE EXCLUSION OF LIABILITY FOR PREGNANCY: YOU EXPRESSLY AGREE AND ACKNOWLEDGE THAT THE DEVELOPER, AUTHOR, DISTRIBUTORS, OWNERS, AND AFFILIATES OF CYCLECIPHER SHALL BEAR ABSOLUTELY ZERO RESPONSIBILITY OR LIABILITY FOR ANY CONCEPTION, INTENDED OR UNINTENDED PREGNANCY, FAILED CONTRACEPTION, PREGNANCY COMPLICATIONS, CHILDBIRTH, MISCARRIAGE, ABORTION, PHYSICAL OR EMOTIONAL INJURY, MEDICAL EXPENSES, CHILD SUPPORT, OR ANY ASSOCIATED CONSEQUENTIAL DAMAGES WHATSOEVER. YOU ASSUME 100% EXCLUSIVE PERSONAL RISK AND FULL RESPONSIBILITY FOR YOUR REPRODUCTIVE CHOICES, CONTRACEPTIVE PRACTICES, AND SEXUAL CONDUCT.

1. Agreement to Terms

This End User License Agreement ("Agreement" or "EULA") is a binding legal contract entered into between you (the "User") and the developer and operator of CycleCipher ("Developer", "we", "us", or "our"). By downloading, installing, accessing, or using the CycleCipher mobile application on iOS, you acknowledge that you have read, understood, and agree to be bound by all the terms and conditions outlined in this Agreement, as well as our Privacy Policy.

If you do not agree to all terms of this Agreement, you must not download, install, or use CycleCipher, and must delete the application immediately from all your devices.

2. Nature of the Service & No Medical Advice

CycleCipher is strictly a personal self-tracking, lifestyle, and observational logging tool. The services, algorithmic predictions, statistics, correlation analyses, and phase overviews provided by the application are provided solely for personal informational and educational purposes.

No Professional Advice: The application does NOT provide medical, gynecological, obstetrical, pharmacological, psychiatric, or diagnostic advice.
No Doctor-Patient Relationship: Using CycleCipher does not create a doctor-patient, healthcare provider, or fiduciary relationship of any kind.
Consult Licensed Professionals: Never disregard, delay, or substitute professional medical advice or clinical evaluation from a qualified physician or gynecologist because of anything you have read, tracked, or calculated within CycleCipher. Always consult a healthcare provider for any questions regarding menstrual irregularities, severe pain, PCOS, endometriosis, abnormal bleeding, or birth control.

3. End User License Grant & Restrictions

Subject to your compliance with this Agreement, the Developer grants you a limited, non-exclusive, non-transferable, non-sublicensable, revocable license to download, install, and execute CycleCipher on Apple-branded iOS products that you own or control, strictly as permitted by the Usage Rules set forth in the Apple Media Services Terms and Conditions.

You agree that you shall NOT:

Decompile, reverse engineer, disassemble, decrypt, or attempt to derive the source code of the application (except to the extent permitted by applicable law).
Distribute, rent, lease, lend, sell, sublicense, or commercially exploit the application to any third party.
Use the application for any unlawful purpose or in violation of any applicable local, national, or international regulations.

4. Zero-Knowledge Cryptographic Architecture & User Responsibility

CycleCipher employs client-side Zero-Knowledge encryption. All sensitive reproductive health records and symptom logs are encrypted locally on your device with keys derived from your hardware credentials:

Your Key Responsibility: Because the Developer does not hold, manage, or know your cryptographic master keys, the Developer cannot recover, decrypt, or restore your data if you lose access to your device, delete your local database without backup, or fail to safeguard your Apple ID credentials.
Local Storage: If you use CycleCipher in Local Account Mode, your records exist solely in the local sandbox of your iPhone. Deleting the application or resetting your device will permanently erase all local records without possibility of remote recovery.

5. In-App Purchases, Lifetime Access & Billing

Certain premium features of CycleCipher may be offered as In-App Purchases, including a Lifetime Access Pass:

Apple StoreKit Billing: All financial transactions, renewals, payments, and refunds are processed exclusively by Apple Inc. via the App Store. The Developer does not store, process, or view your payment card details.
Refunds: All refund requests must be directed to Apple Inc. in accordance with Apple's standard App Store refund policies and guidelines. The Developer has no technical ability to issue refunds directly.

6. Disclaimer of Warranties ("AS IS" & "AS AVAILABLE")

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, CYCLECIPHER AND ALL ASSOCIATED SERVICES, FEATURES, AND CONTENT ARE PROVIDED STRICTLY ON AN "AS IS" AND "AS AVAILABLE" BASIS, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE.

THE DEVELOPER EXPRESSLY DISCLAIMS ALL WARRANTIES, INCLUDING BUT NOT LIMITED TO:

IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
ANY WARRANTY THAT THE OPERATION OF THE APPLICATION WILL BE UNINTERRUPTED, TIMELY, ERROR-FREE, SECURE, OR FREE FROM DATA LOSS OR DEFECTS.
ANY WARRANTY CONCERNING THE ACCURACY, RELIABILITY, BIOLOGICAL RELEVANCE, OR PREDICTIVE PRECISION OF ANY CYCLE ESTIMATE, OVULATION DATE, FERTILE WINDOW, OR CORRELATION METRIC.

7. Comprehensive Limitation of Liability

TO THE FULLEST EXTENT PERMISSIBLE UNDER APPLICABLE LAW, UNDER NO CIRCUMSTANCES SHALL THE DEVELOPER, ITS CREATORS, EMPLOYEES, CONTRACTORS, LICENSORS, OR SUPPLIERS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, SPECIAL, PUNITIVE, EXEMPLARY, OR STATUTORY DAMAGES, ARISING OUT OF OR IN CONNECTION WITH YOUR USE OR INABILITY TO USE CYCLECIPHER.

THIS EXCLUSION INCLUDES, WITHOUT LIMITATION, DAMAGES FOR:

CONCEPTION, UNPLANNED OR UNWANTED PREGNANCY, MISSED CYCLES, BIRTH DEFECTS, OR PREGNANCY COMPLICATIONS;
FAILURE OF NATURAL FAMILY PLANNING, TIMED INTERCOURSE, OR CONTRACEPTIVE STRATEGIES;
EMOTIONAL DISTRESS, PAIN AND SUFFERING, OR MENTAL ANGUISH;
HEALTHCARE COSTS, MEDICAL BILLS, OR EXPENSES RELATED TO CHILDCARE OR CHILDBIRTH;
LOSS OF DATA, DEVICE DAMAGE, HARDWARE FAILURE, SYSTEM CRASHES, OR RESTORATION COSTS.

IN ANY EVENT, THE DEVELOPER’S AGGREGATE MAXIMUM CUMULATIVE LIABILITY ARISING OUT OF OR RELATING TO THIS AGREEMENT OR YOUR USE OF THE APPLICATION SHALL NOT EXCEED THE TOTAL AMOUNT ACTUALLY PAID BY YOU FOR THE CYCLECIPHER APPLICATION IN THE TWELVE (12) MONTHS IMMEDIATELY PRECEDING THE CLAIM, OR TEN EUROS (€10.00 EUR), WHICHEVER IS LOWER.

8. Indemnification

You agree to defend, indemnify, and hold harmless the Developer, its owners, creators, and affiliates from and against any and all claims, liabilities, lawsuits, damages, losses, costs, expenses, and reasonable attorney's fees arising out of or related to:

Your use, misuse, or reliance on CycleCipher or any data, calculation, or prediction generated therein;
Your violation of any provision of this Agreement;
Any claim by a third party (including a sexual partner, dependent, or family member) regarding unintended pregnancy, conception, or medical injury related to your use of the application.

9. Apple-Specific Standard EULA Terms (Schedule 2)

As required by Apple Inc., the following additional terms apply to all users downloading CycleCipher via the Apple iOS App Store:

Acknowledgment: This Agreement is concluded solely between you and the Developer, not with Apple Inc. The Developer, and not Apple, is solely responsible for CycleCipher and the content thereof.
Scope of License: The license granted to you for CycleCipher is limited to a non-transferable license to use the app on any Apple-branded products running iOS that you own or control, in accordance with the Usage Rules set forth in the Apple Media Services Terms and Conditions.
Maintenance and Support: The Developer is solely responsible for providing any maintenance and support services for CycleCipher. You acknowledge that Apple has no obligation whatsoever to furnish any maintenance and support services with respect to the app.
Warranty: In the event of any failure of the app to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price for the app to you. To the maximum extent permitted by applicable law, Apple will have no other warranty obligation whatsoever with respect to the app.
Product Claims: The Developer, not Apple, is responsible for addressing any claims of the end-user or any third party relating to the app, including product liability claims, non-conformance claims, and claims arising under consumer protection or privacy legislation.
Intellectual Property Rights: In the event of any third-party claim that the app or your possession and use of the app infringes that third party’s intellectual property rights, the Developer, not Apple, will be solely responsible for the investigation, defense, settlement, and discharge of any such claim.
Third-Party Beneficiary: Apple and Apple's subsidiaries are third-party beneficiaries of this Agreement. Upon your acceptance of this Agreement, Apple will have the right (and will be deemed to have accepted the right) to enforce this Agreement against you as a third-party beneficiary thereof.

10. Dispute Resolution & Class Action Waiver

YOU AND THE DEVELOPER AGREE THAT ANY DISPUTE, CONTROVERSY, OR CLAIM ARISING OUT OF OR RELATING TO THIS AGREEMENT OR CYCLECIPHER SHALL BE RESOLVED EXCLUSIVELY ON AN INDIVIDUAL BASIS. YOU EXPRESSLY WAIVE ANY RIGHT TO COMMENCE, JOIN, OR PARTICIPATE IN ANY CLASS ACTION, COLLECTIVE ACTION, OR REPRESENTATIVE PROCEEDING AGAINST THE DEVELOPER.

11. Severability & Entire Agreement

If any provision of this Agreement is held to be invalid, illegal, or unenforceable under applicable law, such provision shall be modified to the minimum extent necessary to make it valid and enforceable, and the remaining provisions shall continue in full force and effect. This Agreement, together with the Privacy Policy, constitutes the complete and exclusive agreement between you and the Developer regarding CycleCipher.

12. Contact Information

For questions or notices regarding this End User License Agreement, please contact:

Email: driesdrs@gmail.com