Terms of Service — SIS (Symptom Insight System)
Effective date: 6 June 2026 · Last updated: 6 June 2026
These terms explain the agreement between you and SIS when you use it. We've kept them as plain as our privacy policy. By using SIS, you're agreeing to them — so if anything here doesn't sit right, please don't use SIS.
1. What SIS is
SIS is a pattern-tracking and summary tool that helps you record symptoms, appointments, medications, and health-related information in a calm, non-diagnostic way — and, when you choose, pull it together into a summary you can share with a clinician. It's a record-keeping and pattern-noticing tool, nothing more and nothing less.
2. SIS is not medical advice or a diagnosis
This is the most important thing on this page: SIS is not a medical device, and it does not give medical advice.
SIS does not diagnose, treat, monitor, or make clinical decisions. It does not provide medical advice, diagnosis, or treatment, and it is not a substitute for advice from a qualified healthcare professional. It is there to help you keep a record and notice patterns — the kind of thing you can take to a professional, not in place of one.
Always speak to your doctor or another suitably qualified professional about any health concern. If you are in crisis or may be in danger, please contact your local emergency services straight away.
3. Who can use SIS
SIS is intended for adults and is not directed at children. The minimum age for digital consent differs by country (commonly between 13 and 16). If you are under the age of digital consent where you live, please use SIS only with the involvement of a parent or guardian.
4. Your information stays on your device
Everything you record in SIS is stored only on the device and browser you use it on. We do not transmit, copy, back up, or have any access to it — as our Privacy Policy explains in full. In other words, what you put into SIS is yours, completely and immediately. By using SIS you also agree to that Privacy Policy.
5. No account, and looking after your device
SIS has no accounts and no sign-in. Because your information lives on your own device, looking after that device is what looks after your information: keep it locked, keep your browser up to date, and be careful using SIS on shared or public devices. If you clear your browser or app storage, your SIS information is deleted — including from us, because we never held a copy.
6. Using SIS fairly
SIS is here for your own personal record-keeping. Please don't:
- use it for any unlawful purpose, or to harm yourself or others;
- try to disrupt, break, copy, scrape, or reverse-engineer it, or work around its limits;
- resell it or use it commercially without our permission.
7. Exports and external links
SIS lets you export or share a summary — for example, to give to a clinician. Once it leaves your device it is under your control, so please handle it as you would any other personal medical document. Any links SIS points you to are run by other people; we don't control them and aren't responsible for their content.
8. Our content
SIS — its software, design, and words — belongs to us and is protected by intellectual-property law. You're given a personal, limited, non-transferable permission to use it for yourself. Everything you record in SIS, and anything you export from it, remains entirely yours.
9. No warranties, and our liability
SIS is provided "as is" and "as available", without warranties of any kind, to the fullest extent the law allows. We don't promise it will be accurate, uninterrupted, or fit for any particular purpose. To the fullest extent permitted by law, we won't be liable for any loss or damage arising from your use of, or inability to use, SIS. Nothing in these terms removes or limits any rights you have as a consumer that cannot be removed or limited by law.
10. Changes to these terms
We may update these terms as SIS develops. If we make a significant change, we'll update the date at the top of this page and surface a notice in the app. Continuing to use SIS after a change means you accept the updated terms.
11. Stopping
You can stop using SIS at any time, and clearing your storage removes your information completely. We may update, change, or withdraw SIS, or parts of it, as it develops.
12. Governing law
These terms are governed by the laws of the Republic of Cyprus, and any disputes will be dealt with by the courts there. This does not affect your statutory rights as a consumer.
13. Contact
If you have any questions about these terms, email us at hello@bigsis.health.
SIS is built on the belief that your story belongs to you. These terms are written to protect that, not to claw any of it back.