Ester

Terms of Use

Ester: Dose & Lab Tracker · Effective June 10, 2026

1. Agreement to these terms

By downloading or using Ester: Dose & Lab Tracker (the “App”), published by Castaneda Networks LLC of West Covina, California (“we,” “us”), you agree to these Terms of Use. If you do not agree, do not use the App.

The App is licensed, not sold, to you. Apple's standard Licensed Application End User License Agreement applies to your use of the App except where these terms supersede it. Apple is not a party to these terms and has no responsibility for the App or its content.

Medical disclaimer — please read

Ester is a tracking and visualization tool. It does not provide medical advice, diagnosis, or treatment recommendations.

Estimated-level charts shown in the App are simplified mathematical models based on the data you enter. They are informational only — they are not laboratory values, they do not measure anything in your body, and the App is not a medical device.

Never start, stop, or change a medication or treatment based on anything shown in the App. Always consult your physician or another qualified healthcare provider about your treatment, your lab results, and any health concerns.

2. Your responsibilities

3. Subscriptions

Some features require an auto-renewing subscription, billed to your Apple ID through the App Store. Prices are shown in the App at the point of purchase. Your subscription renews automatically unless you cancel at least 24 hours before the end of the current period. You can manage or cancel your subscription at any time in your App Store account settings. Refunds are handled by Apple under its policies.

4. Intellectual property

The App, including its design, code, charts, and content (but not the data you enter, which is yours), is owned by Castaneda Networks LLC and protected by intellectual-property laws. You may not copy, modify, reverse-engineer, or redistribute the App except as permitted by law or by Apple's EULA.

5. No warranty

The App is provided “as is” and “as available,” without warranties of any kind, express or implied, including warranties of merchantability, fitness for a particular purpose, accuracy, and non-infringement. We do not warrant that the App will be error-free or uninterrupted, or that its estimates or calculations are suitable for any particular purpose.

6. Limitation of liability

To the maximum extent permitted by law, Castaneda Networks LLC will not be liable for any indirect, incidental, special, consequential, or exemplary damages — including health outcomes, lost data, or lost profits — arising from or related to your use of the App. Our total liability for any claim relating to the App will not exceed the amount you paid us for the App in the twelve months before the claim arose.

7. Indemnification

You agree to indemnify and hold harmless Castaneda Networks LLC from claims, damages, and expenses (including reasonable attorneys' fees) arising from your misuse of the App or your violation of these terms.

8. Termination

You may stop using the App at any time; deleting it removes your data from your device. We may terminate or suspend this license if you breach these terms. Sections 4 through 10 survive termination.

9. Governing law

These terms are governed by the laws of the State of California, without regard to its conflict-of-law rules. Any dispute will be resolved in the state or federal courts located in Los Angeles County, California, unless applicable law requires otherwise.

10. Severability

If any provision of these terms is found unenforceable, the remaining provisions remain in full effect.

11. Changes to these terms

We may update these terms from time to time. The effective date above reflects the latest revision, and material changes will be noted in the App or on this page. Continued use of the App after changes take effect constitutes acceptance of the revised terms.

12. Contact

Questions about these terms? Email us at admin@castanedanetworks.com.

Castaneda Networks LLC, West Covina, California, United States.