Privacy Policy
Effective date: September 2, 2025
Body Fat Calculator (‘we’, ‘our’, ‘us’) helps you estimate and track body fat and related metrics. This policy explains what we collect, why, and how you can control your data. It applies to all public pages (like the <a class="link" href="/en/calculator">Calculator</a>) and to signed-in features.
What we collect
- Account & authentication: when you sign in, we rely on Stytch to create a session. We set session cookies to keep you signed in (e.g. stytch_session_jwt and stytch_session). These identify your session and are required for protected pages.
- Profile (optional): details you provide to personalize calculations (e.g., sex, units).
- Measurements (optional): entries you explicitly save, like weight, height, neck, waist, and hips (for women). You can add, edit, and delete these at any time.
- Usage data: basic diagnostics and page views to understand app performance and improve UX. See ‘Analytics’ below.
Results are estimates for personal tracking only and are not a medical diagnosis. Always consult a qualified professional for health decisions.
Cookies
We use essential cookies to maintain your session after you authenticate. These include Stytch session cookies that let protected routes verify who you are. If you block essential cookies, sign-in and protected features may not work.
Analytics
We use Google Analytics 4 (GA4) in a privacy-minded way:
- IP anonymization enabled for page views.
- No automatic page_view: page views are sent manually on navigation to reduce noise.
- No PII in analytics — we avoid sending personally identifiable information to GA.
You can block analytics via your browser or extensions and the app will still function. Analytics help us find bugs and improve UX.
How we use your data
- To run core features (auth, saving and showing your measurements, charts)
- To improve reliability, performance, and UX
- To detect abuse and maintain security
How we store your data
Measurement and account data are stored in our database; serverless functions handle read/write under your authenticated session. Access is restricted to the app and minimal operational tooling. We retain data while your account exists or until you delete it.
Your choices
- Use without an account: you can try the public calculator with no sign-in (no measurements stored).
- Delete measurements: remove entries you no longer want to keep in your tracker.
- Sign out: clears your session on the device.
- Analytics opt-out: block GA via your browser or privacy tools.
Data deletion & account removal
If you’d like your account and stored data deleted, please reach out using the contact below from the same email you used to sign in.
Children’s privacy
This app is not directed to children under 13. If you believe a child has provided us data, contact us and we’ll delete it.
Changes to this policy
We may update this policy as the app evolves. Material changes will be reflected on this page with an updated effective date.
Contact
Email: <a class="link" href="mailto:support@microsaaslabs.com">support@microsaaslabs.com</a>