Terms of Use
By using fjt you accept the terms below. Please read them carefully. Last updated: 29 September 2026.
1. Scope of Service
fjt is a lifestyle and mindfulness app that produces a "biological age" estimate from the daily habit and lifestyle data you enter (sleep, energy, stress, activity, etc.). The app is intended for informational and motivational purposes only.
2. Not Medical Advice
fjt is not a medical device, diagnostic tool, or health service. No content in the app may be interpreted as a diagnosis, treatment, medication, supplement, or diet recommendation. You should make every decision concerning your health only under the guidance of a qualified physician.
3. We Do Not Give Recommendations
The in-app activities are merely a tool for you to keep records; fjt does not recommend doing them and does not provide a personalized program or prescription. All decisions and responsibility about which activity to perform are yours.
4. Disclaimer of Liability
All responsibility arising from your use of the app rests with the user. fjt does not guarantee the accuracy of the estimated age value shown and cannot be held liable for any damage resulting from decisions made based on that value.
5. User Obligations
You agree to enter accurate and up-to-date data, keep your account secure, and use the app in compliance with the law. It is recommended that people under 18 use the app under the supervision of a guardian.
6. fjt Features
fjt offers fjt-powered features such as the "fjt Coach" and meal photo analysis. These features are for informational and motivational purposes only; they do not replace medical diagnosis, treatment, dietetics, or health services. Responses and analyses produced by fjt may be inaccurate or incomplete; you should make health decisions only with the approval of a physician or qualified expert.
Messages you send in the coach chat and meal photos you upload are not stored permanently in our app; they are temporarily transmitted to and processed by fjt.ai's preferred model providers for analysis. All responsibility arising from the use of fjt outputs rests with you.
7. Changes
We may update these terms from time to time. Significant changes will be communicated within the app. Continuing to use the app after updates means you accept the new terms.