Privacy
AndThenHow Fever is designed around local browser storage, with optional verified-email backups. This page explains what stays local and what is processed when you use email features.
Local-first storage
AndThenHow Fever currently saves tracking data in your browser profile on your device.
This may include child profiles, dates of birth, weights, temperature readings, medication logs, symptoms, sleep, hydration, and notes that you enter.
No account required
You can use the tracker without providing an email address or creating a cloud account.
Optional email verification creates a Supabase authentication identity so we can confirm where to send a requested backup. It does not upload your local tracker records or create a password.
What we collect
The app does not currently send your fever tracking records to our server as part of normal local tracking.
If you verify an email, Supabase stores the email address and authentication details. We also store your optional update-subscription preference and limited timestamps and counts used to prevent backup-email abuse.
Standard hosting logs may still be created by infrastructure providers when your browser visits the site, such as request time, URL, IP address, browser details, and basic security logs.
Email backups
When you request a backup, your browser creates the CSV and sends it to our server. The server verifies your email identity and sends the attachment only to that verified address through Resend.
AndThenHow does not save the CSV in its application database. Vercel and Resend process the request to deliver it, and the attachment may remain in your email account after delivery.
Optional updates
Product updates are optional and disabled by default. If you subscribe, we will send no more than one update email a month.
You can unsubscribe from the verified-email page at any time. Update emails will also include an unsubscribe option once sending begins.
Public page analytics
We use Google Analytics on public pages such as the homepage, fever guides, terms, and privacy pages to understand which content is useful.
Google Analytics is not loaded on the private tracker routes, and fever tracking records such as child profiles, temperatures, medicines, symptoms, and notes are not sent to analytics.
Data loss and shared devices
Clearing browser data, clearing site data, changing browsers, or uninstalling your browser may delete locally saved records.
Anyone with access to the same unlocked browser profile or device may be able to view local tracker data.
Retention and deletion
Local tracker records remain until you remove them or clear this browser profile. Verified email and preference records are kept until they are no longer needed or you request deletion.
To request access, correction, or deletion of stored email information, contact fever@andthenhow.com. Future sync or caregiver-sharing features will explain what is uploaded and ask for confirmation before moving local tracker data to cloud storage.