Privacy Policy

Last updated: July 15, 2026

KronixAI ("KronixAI," "we," "us," or "our") is an AI-powered personal health and fitness app for iOS. This Privacy Policy explains what information the app collects, how we use it, who we share it with, and the choices and rights you have. By using KronixAI you agree to this policy.

KronixAI provides general wellness information and is not a medical device and does not provide medical advice, diagnosis, or treatment. Always consult a qualified professional for medical decisions.

1. Who we are

KronixAI is operated by Wesley Huang ("the developer"). For any privacy question or request, contact us at wesleyh93@gmail.com.

2. Information we collect

We only collect what the app needs to work. We do not run third-party advertising or sell your data.

a) Account information. When you sign in with Sign in with Apple, we receive an identifier and, if you choose to share it, your name and an email address (which may be an Apple private-relay address). We store a Firebase authentication user ID to associate your data with your account.

b) Health and fitness information you provide. The core of the app: data you log or that the AI logs on your behalf — sleep, workouts and exercises, nutrition/meals and estimated macros, physical activities, injuries and pain check-ins, body composition, supplements, and free-text notes about your lifestyle, stress, travel, or illness.

c) Apple Health (HealthKit) data. With your explicit permission, KronixAI reads health metrics from Apple Health — such as sleep, heart rate, heart-rate variability, resting heart rate, and workouts/active energy — to populate your records and insights. This data is read on your device; you can grant or revoke access at any time in iOS Settings → Health. KronixAI does not read Health data you have not authorized.

d) Photos. If you attach a meal photo for AI food logging, the image is uploaded to our storage and associated with that entry. We access your camera and photo library only when you choose to add a photo.

e) Limited operational data. We keep minimal records needed to run and maintain the service (for example, AI token-usage counts for cost monitoring). We do not use third-party advertising or cross-app tracking SDKs.

f) Feedback you submit. When you send feedback from within the app, we collect the message you write, the category you choose (for example, idea or bug), and basic technical context (app version, release channel, and platform) so we can understand and act on it.

3. How we use your information

To provide the app's features: logging, tracking, and displaying your data.
To generate AI insights, health scores, coaching, and chat responses by analyzing your data (see Section 4).
To maintain, secure, debug, and improve the service.
To communicate with you about your account or support requests.
To review, respond to, and act on feedback you submit, and to improve the app.

We do not use your health information for advertising, marketing, or data-mining, and we do not sell it.

4. AI processing and service providers

To power insights and chat, KronixAI sends the relevant portions of your data to Anthropic PBC ("Anthropic"), the provider of the Claude AI models, which processes it to generate responses and returns them to the app. Under Anthropic's commercial API terms, your inputs and the outputs are not used to train Anthropic's models. Requests are routed through our own secure backend so that credentials are never stored on your device.

We send your data to Anthropic only after you have given explicit, in-app consent to AI processing. You can withdraw that consent at any time by deleting your account (Profile → Delete Account), which stops any further AI processing and removes your data as described in Section 8.

We also use Google Firebase (Google LLC) for authentication, database (Firestore), file storage, and cloud functions. Your data is stored on Google Cloud infrastructure.

These providers act as our processors/sub-processors and may only use the data to provide their services to us. We do not authorize them to use your health data for their own purposes.

5. Apple Health (HealthKit) commitments

Consistent with Apple's requirements, we will not:

use HealthKit data for advertising, marketing, or use-based data mining;
disclose HealthKit data to third parties for advertising or similar services, or sell it to data brokers or information resellers;
use HealthKit data for any purpose other than providing you health and fitness features within KronixAI.

HealthKit data is used only to power the app's insights and records for you, is tied to your account, and is never stored in iCloud on our behalf.

6. How your data is stored and secured

Your data is stored in Google Firebase and is scoped to your account by server-side security rules, so one user cannot access another user's data. Traffic between the app, our backend, and our providers is encrypted in transit (HTTPS/TLS). No method of transmission or storage is 100% secure, but we take reasonable measures to protect your information.

7. Sharing

We share your information only:

with the service providers in Section 4, to operate the app;
if required by law, or to protect rights, safety, or property;
in connection with a business transfer (e.g. merger or acquisition), subject to this policy.

We do not sell your personal or health information.

8. Data retention and deletion

We keep your data while your account is active. You can delete your account and all associated data at any time from within the app: open Profile → Delete Account. This permanently removes your profile, all logged data, your uploaded photos, and your login. Deletion is immediate and cannot be undone. You may also email wesleyh93@gmail.com to request deletion.

Revoking Apple Health permission (iOS Settings → Health) stops further reads but does not by itself delete data already saved in KronixAI — use Delete Account or remove individual entries in the app for that.

9. Your rights

Depending on where you live, you may have rights to access, correct, export, or delete your personal information, and to object to or restrict certain processing. You can exercise most of these directly in the app (view, edit, and delete entries; delete your account) or by contacting us at wesleyh93@gmail.com. We will respond within the time required by applicable law.

10. Children

KronixAI is not directed to children under 16 (or the minimum age required in your country), and we do not knowingly collect their information. If you believe a child has provided us data, contact us and we will delete it.

11. International users

Your information may be processed in the United States and other countries where we or our providers operate, which may have different data-protection laws than your own. By using the app you consent to this processing.

12. Changes to this policy

We may update this policy from time to time. We will revise the "Last updated" date above and, for material changes, provide notice in the app. Continued use after changes means you accept the updated policy.

13. Contact

Questions or requests: wesleyh93@gmail.com.