SeasonFit stays on your device

Inputs and calculations run in your browser. Sharing encodes only the necessary values into the URL fragment so nothing is stored on our servers.

What data is processed

Birthdate, sex, measurement date, height in centimetres, and the derived projections shown on screen. These stay in the browser unless you choose to share a link.

Purpose of processing

To calculate and display growth forecasts for ages 0–5, let you print or share them with caregivers, and improve the product experience.

Legal basis

Legitimate interest in providing the calculator and helping caregivers plan. Analytics only runs with your consent.

Data retention

Inputs are stored locally in the browser and are cleared when you close or reset the app. Shared links embed encoded inputs in the URL hash (#share=...) until you remove or stop sharing them. No personal data is stored server-side by default.

Third parties

Google Analytics 4 collects aggregate usage metrics (page views, device type, language) to improve the app. Personal profile data is not sent.

Cookies & analytics

Only essential storage is used to remember language and consent. Analytics cookies are set only after acceptance, and you can decline at any time.

User rights & contact

You can request access or deletion of any data you provided, withdraw analytics consent, or ask questions at privacy@felthaus-engineering.dk.