Terms of Service

Last updated: October 25, 2026

These Terms govern your use of Bruce’s Annuity Calculator, called Seraph: Life Expectancy before version 2.0 (the “App”), made by Hailcat LLC (“Hailcat,” “we,” “us,” or “our”), and of the website at hailcat.app (the “Site”). By using the App or the Site, you agree to them.

1. The service

The App values a stream of payments, for a fixed length of time or for life, and solves for the value today, the payment, the interest rate or the length. For payments for life, it asks a short set of questions about health and background and shows a life expectancy, the range around it, and a survival curve. We grant you a non-exclusive, non-transferable, revocable license to use the App for any lawful purpose, personal or professional, subject to these Terms and the App Store terms.

The App is intended for adults aged 18 or over and for use in the United States. It is built on United States mortality data and is not calibrated for other countries.

2. Educational purpose, not financial or medical advice

The App is provided for general educational and informational purposes only. Its values follow from the numbers you enter: the payments, the interest rate, the raises and when the payments start and stop. It does not model taxes, fees, inflation you have not entered, or whether whoever owes the payments can make them, and it does not tell you whether any offer is a good one. A different rate gives a different value.

Its life expectancies are statistical illustrations, not forecasts of anyone’s actual lifespan, and a value for payments for life is an average over the lifespans the model expects, not the amount anyone will receive. In particular:

• the estimate describes averages across large groups of people who answered as you did, and says nothing certain about any individual, including you;
• it is built from published population mortality data and from your self-reported answers, which we cannot verify and do not check for accuracy;
• it uses a small number of questions. It knows nothing about your family history in detail, your genetics, your medical records, your test results, your medications, your occupation, or where you live, all of which matter;
• the personal adjustment is measured on adults aged 40 and older. Below that age the App says so on screen, and the figure is an extrapolation rather than a measurement;
• it projects future improvements in mortality that are themselves uncertain, and medicine, public health and your own circumstances can change in ways no model captures;
• different tools, including those built by other actuaries and by doctors, will give different answers for the same person. That is a real feature of this problem, not a defect in one of them.

Nothing in the App is medical, health, insurance, investment, tax, or legal advice, and no doctor-patient, fiduciary, or advisory relationship is created by your use of it. Do not use the App to diagnose or treat any condition, to decide whether to seek care, or to stop or change any treatment. If you are worried about your health, speak to a qualified professional. If you are in crisis, contact your local emergency services; in the United States you can call or text 988 for the Suicide and Crisis Lifeline.

3. Your data

Your answers and calculations are used on your device. Starting with version 2.0, the App keeps your most recent answers and your last 100 calculations on your device until you erase them in Settings. We collect a small amount of anonymous usage data, which carries no identifier and does not include your date of birth. All of it is described in our Privacy Policy, which forms part of these Terms.

4. Acceptable use

You agree not to misuse the App, for example by reverse engineering it (except as permitted by law), interfering with its operation, sending automated or forged traffic to our systems, or using it in violation of applicable law.

You may use the App for any lawful purpose, personal or professional, including work for clients or an employer. You are responsible for checking its results before relying on them, and for any decision you make with them.

5. Intellectual property

The App and Site, including their design, text, graphics, and the underlying model and its calibration, are owned by Hailcat LLC and protected by intellectual-property laws. These Terms do not grant you any rights in our trademarks or content except the limited license to use the App described above. The underlying government and actuarial data sources are published by their respective bodies and are not ours.

6. No warranty

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

7. Limitation of liability

To the fullest extent permitted by law, Hailcat LLC will not be liable for any indirect, incidental, special, consequential, or punitive damages, or for any health, medical, financial, or other decisions or losses arising out of or related to your use of the App, the Site, or the estimates they produce. Our total liability for any claim relating to the App will not exceed the amount you paid us for the App (which may be zero).

8. Changes

We may update the App and these Terms from time to time. This includes adding, changing, removing, or beginning to charge for features; a feature being free today does not guarantee it will remain free. We also expect to improve the underlying model, which means the same answers may produce a different estimate in a later version. Material changes to these Terms will be reflected by updating the “Last updated” date above. Your continued use of the App after changes take effect means you accept the updated Terms.

9. Governing law

These Terms are governed by the laws of the United States and the state in which Hailcat LLC is organized, without regard to conflict-of-laws rules.

10. Contact

Questions about these Terms? Reach us through our contact form.