End-User License Agreement (EULA)

Last updated: 5 June 2026 · Effective: 5 June 2026

Short version: We (Tunnxo) license you the CycleSync app under these terms. You can use it on your Apple- or Google-branded devices, you can't reverse-engineer or redistribute it, and we can revoke the license if you break the rules. The full text below mirrors Apple's standard EULA structure and is required by the App Store.

This End-User License Agreement ("Agreement," "EULA," or "License") is a legal contract between you ("you," "your," or "the Licensee") and Tunnxo ("we," "us," "our," or "the Licensor") for the CycleSync mobile application, including any updates, upgrades, or related services (collectively, the "Licensed Application" or "App").

By installing, accessing, or otherwise using the Licensed Application, you agree to be bound by the terms of this Agreement. If you do not agree, do not install or use the Licensed Application.

1. Acknowledgement

Both you and Tunnxo acknowledge that this EULA is concluded between you and Tunnxo only, and not with Apple Inc. ("Apple") or Google LLC ("Google"). Tunnxo, not Apple or Google, is solely responsible for the Licensed Application and the content thereof.

You and Tunnxo also acknowledge that, as between Tunnxo, Apple, and Google, Tunnxo (and not Apple or Google) is responsible for addressing any claims by you or any third party relating to the Licensed Application or your possession and/or use of the Licensed Application, including but not limited to: (i) product liability claims; (ii) any claim that the Licensed Application fails to conform to any applicable legal or regulatory requirement; and (iii) claims arising under consumer protection, privacy, or similar legislation.

2. License grant

Subject to your continued compliance with this Agreement, Tunnxo grants you a limited, non-exclusive, non-transferable, revocable license to download, install, and use the Licensed Application on devices you own or control, for personal, non-commercial purposes.

Where the Licensed Application is acquired through the Apple App Store, the license is further limited to use on an Apple-branded product that runs iOS or iPadOS. Where acquired through Google Play, the license is further limited to use on an Android device that meets the published compatibility requirements.

You may not distribute or make the Licensed Application available over a network where it could be used by multiple devices at the same time. You may not transfer, redistribute, or sublicense the Licensed Application.

3. License restrictions

You agree not to, and not to permit any other person to:

Modify, translate, adapt, or create derivative works of the Licensed Application, in whole or in part.
Reverse-engineer, decompile, disassemble, or otherwise attempt to derive the source code of the Licensed Application, except to the extent expressly permitted by applicable law (and only after providing Tunnxo with reasonable prior written notice and an opportunity to provide the requested information through other means).
Remove, alter, or obscure any copyright, trademark, or other proprietary notices contained in the Licensed Application.
Use the Licensed Application in connection with any unlawful activity or to violate any applicable laws, regulations, or third-party rights.
Use the Licensed Application to develop, train, or improve any product or service that competes with the Licensed Application.
Rent, lease, sell, sublicense, or otherwise transfer rights in the Licensed Application.
Use any automated or manual process to extract data from the Licensed Application (scraping) except as expressly permitted by us.

4. Ownership

All right, title, and interest in and to the Licensed Application, including all intellectual-property rights therein (including source code, object code, design, graphics, illustrations, copy, and trademarks), are and shall remain the exclusive property of Tunnxo and its licensors. The License granted under this Agreement does not constitute a sale of any such rights.

CycleSync, the CycleSync logo, and the seasonal cycle metaphor as expressed in the Licensed Application are trademarks of Tunnxo.

5. Third-party materials

The Licensed Application may display, include, or make available third-party content, data, information, applications, or materials ("Third-Party Materials") or provide links to third-party websites or services. You acknowledge and agree that Tunnxo is not responsible for any Third-Party Materials, including their accuracy, completeness, timeliness, validity, copyright compliance, legality, decency, quality, or any other aspect thereof. Tunnxo does not assume and will not have any liability or responsibility to you or any other person or entity for any Third-Party Materials.

6. User content & data

The Licensed Application processes data you enter or import (cycle logs, calendar events, focus preferences) on your device. As between you and Tunnxo, you retain all rights in your User Content. Tunnxo does not upload your User Content to any server operated by us, does not access it remotely, and does not use it for any purpose other than providing the Licensed Application's features on your device.

Tunnxo's broader data practices are described in the Privacy Policy, which is incorporated by reference into this Agreement. In the event of any conflict between this Agreement and the Privacy Policy regarding data handling, the Privacy Policy controls.

7. In-app subscriptions

The Licensed Application offers optional paid subscriptions ("Pro") that unlock additional features. Subscriptions are purchased through the Apple App Store or Google Play, are subject to the terms of those stores, and are governed in addition by our Terms of Service §6 (Subscriptions & billing). In the event of conflict between this section and the Terms of Service, the Terms of Service control for subscription-specific matters.

Subscriptions renew automatically until canceled. You can manage or cancel your subscription through your store account at any time.

8. Health-related features

The Licensed Application offers optional integrations with Apple Health (iOS) and Google Health Connect (Android). These integrations are read-only and operate only with your explicit, granular consent at the platform level. You may revoke this consent at any time in your device's health settings.

The Licensed Application is a wellness and productivity tool, not a medical device. It does not provide medical advice, diagnosis, or treatment. Cycle phase predictions and energy forecasts are general indicators, not medical assessments. Always consult a qualified healthcare provider for any health-related decisions.

9. Maintenance & support

Tunnxo is solely responsible for providing any maintenance and support services with respect to the Licensed Application, as specified in this Agreement or as required under applicable law. You and Tunnxo acknowledge that Apple and Google have no obligation whatsoever to furnish any maintenance and support services with respect to the Licensed Application.

10. Warranty disclaimer

THE LICENSED APPLICATION IS PROVIDED "AS IS" AND "AS AVAILABLE," WITH ALL FAULTS AND WITHOUT WARRANTY OF ANY KIND. TUNNXO HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS WITH RESPECT TO THE LICENSED APPLICATION, EITHER EXPRESS, IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES AND/OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, QUIET ENJOYMENT, AND NON-INFRINGEMENT OF THIRD-PARTY RIGHTS.

TUNNXO DOES NOT WARRANT AGAINST INTERFERENCE WITH YOUR ENJOYMENT OF THE LICENSED APPLICATION, THAT THE FUNCTIONS CONTAINED IN OR SERVICES PERFORMED OR PROVIDED BY THE LICENSED APPLICATION WILL MEET YOUR REQUIREMENTS, THAT THE OPERATION OF THE LICENSED APPLICATION WILL BE UNINTERRUPTED OR ERROR-FREE, OR THAT DEFECTS IN THE LICENSED APPLICATION WILL BE CORRECTED.

NO ORAL OR WRITTEN INFORMATION OR ADVICE GIVEN BY TUNNXO OR AN AUTHORIZED REPRESENTATIVE SHALL CREATE A WARRANTY. SHOULD THE LICENSED APPLICATION PROVE DEFECTIVE, YOU ASSUME THE ENTIRE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

11. Limitation of liability

TO THE MAXIMUM EXTENT NOT PROHIBITED BY APPLICABLE LAW, IN NO EVENT SHALL TUNNXO, ITS AFFILIATES, OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, SUPPLIERS, OR LICENSORS BE LIABLE FOR PERSONAL INJURY, OR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS OF PROFITS, LOSS OF DATA, BUSINESS INTERRUPTION, OR ANY OTHER COMMERCIAL DAMAGES OR LOSSES, ARISING OUT OF OR RELATED TO YOUR USE OF OR INABILITY TO USE THE LICENSED APPLICATION, HOWEVER CAUSED, REGARDLESS OF THE THEORY OF LIABILITY (CONTRACT, TORT, OR OTHERWISE) AND EVEN IF TUNNXO HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

In no event shall Tunnxo's total cumulative liability to you for all damages exceed the greater of (a) the amount you paid for the Licensed Application in the 12 months preceding the claim or (b) USD $50.

The foregoing limitations will apply even if the above stated remedy fails of its essential purpose.

12. Indemnification

You agree to indemnify, defend, and hold harmless Tunnxo, its affiliates, officers, directors, employees, agents, suppliers, and licensors from and against any and all claims, losses, liabilities, damages, costs, and expenses (including reasonable attorneys' fees) arising from (a) your use of the Licensed Application; (b) your violation of this Agreement; (c) your violation of any third-party right, including any intellectual-property or privacy right; or (d) any claim that your User Content caused damage to a third party.

13. Export controls

You may not use, export, re-export, import, or transfer the Licensed Application except as authorized by United States law, the laws of the jurisdiction in which you obtained the Licensed Application, and any other applicable laws and regulations. In particular, but without limitation, the Licensed Application may not be exported or re-exported (a) into any US-embargoed countries or (b) to anyone on the US Treasury Department's list of Specially Designated Nationals or the US Department of Commerce Denied Persons List or Entity List.

14. Termination

This Agreement is effective until terminated. Your rights under this Agreement terminate automatically without notice from Tunnxo if you fail to comply with any of its terms. Upon termination, you must cease all use of the Licensed Application and destroy all copies, full or partial, of the Licensed Application in your possession.

Sections 4 (Ownership), 10 (Warranty disclaimer), 11 (Limitation of liability), 12 (Indemnification), 16 (Governing law), and 17 (Miscellaneous) shall survive any termination.

Where the Licensed Application was acquired through the Apple App Store, you acknowledge that Apple and its subsidiaries are third-party beneficiaries of this Agreement and that, upon your acceptance of the terms and conditions 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. The same applies to Google and its affiliates for the Google Play distribution channel.

15. Changes to this EULA

Tunnxo may modify this EULA at any time. We will provide notice of material changes by updating the "Last updated" date at the top of this page and surfacing a notice in the Licensed Application on the next launch. Your continued use of the Licensed Application after a material change indicates acceptance of the updated EULA. If you do not agree to the updated EULA, you must stop using the Licensed Application and uninstall it.

16. Governing law

This Agreement shall be governed by and construed in accordance with the laws of the jurisdiction in which Tunnxo is established, without regard to its conflict-of-law principles. The United Nations Convention on Contracts for the International Sale of Goods does not apply to this Agreement.

To the extent permitted by applicable law, any dispute arising out of or relating to this Agreement shall be resolved through the dispute resolution process described in §17 of our Terms of Service.

17. Miscellaneous

Entire agreement. This Agreement (together with the Privacy Policy and Terms of Service) constitutes the entire agreement between you and Tunnxo regarding the Licensed Application and supersedes all prior or contemporaneous understandings.

Severability. If any provision of this Agreement is held to be unenforceable, that provision shall be modified to the minimum extent necessary to make it enforceable, and the remaining provisions shall remain in full force and effect.

No waiver. Tunnxo's failure to enforce any right or provision of this Agreement will not be deemed a waiver of such right or provision.

Assignment. You may not assign or transfer this Agreement or your rights hereunder without Tunnxo's prior written consent. Tunnxo may assign this Agreement without restriction.

Headings. Section headings are for convenience only and have no legal effect.

Third-party beneficiaries. As noted in §14, Apple and Google (as applicable) are third-party beneficiaries of this Agreement.

18. Contact

Questions about this EULA? Reach out at:

Email: legal@cyclesync.app
Support: cyclesync.app/support