Privacy, in plain language

Privacy policy

Linea keeps your health logs so they're never stuck on one phone, and does nothing else with them. This page explains exactly what we store, where, and how to delete it.

Effective October 1, 2026

The short version

  • You sign in with Apple. You can hide your email from us.
  • Your logs sync to your private Linea account, encrypted at rest and locked to you.
  • Meal photos and AI chats are analyzed and discarded. We keep only usage counts.
  • No ads, no analytics SDKs, no tracking. We never sell or share your data.
  • Delete your account in the app and everything goes with it.

Linea is an iOS app operated by Master Software (“we”, “us”). This policy covers the app and this website, uselinea.app.

Your account

Linea uses Sign in with Apple. Apple gives us a private account identifier and, if you choose to share them, your first name and email address. If you pick “Hide my email”, we only see an Apple relay address. We use these to run your account, restore your data when you sign in, and reply if you contact us. There is no password to create or leak.

Where your data lives

Everything you enter in Linea, including medications, doses, injection sites, vials, weight, symptoms, protein, water, meals and notes, is stored on your iPhone and synced to your account in Linea's database, hosted by our infrastructure provider Supabase in the United States. It is encrypted in transit and at rest, and access rules in the database only let your signed-in account read or change your rows.

We use your logs only to show them back to you on your devices. Our team can see that an account exists and how many entries it has, never what they say. Shot reminders are scheduled on your iPhone as local notifications, and your profile photo stays on your iPhone.

Linea AI and meal scan

AI features are optional, part of Linea Pro, and ask for your permission before their first use. You can withdraw it any time in Settings.

  • Meal scan: the photo you take (and any note you add) is sent through our server to a third-party AI provider, which returns an estimate of the food and its nutrition. The photo is not stored by us. The resulting meal entry is saved to your logs like anything else you enter.
  • Linea AI chat: your messages, and only if you turn on “Let Linea use my logs”, a summary of your recent logs, are sent the same way. Your conversations are kept on your iPhone only and are not synced to your account.
  • The AI provider processes this data only to answer the request, does not use it to train its models, and may keep it for up to 30 days for abuse monitoring before deleting it.
  • We keep usage counts per day (number of requests and their cost) to enforce daily limits, never the content.

Progress photos

Progress photos are stored in your account's private photo storage so they come back on a new phone. Only your signed-in account can open them. They are never added to your camera roll unless you export one, and they are never sent to the AI provider.

What we don't do

  • We don't include analytics, crash-reporting or advertising SDKs in the app.
  • We don't show ads, track you across apps or websites, or build an advertising profile.
  • We don't sell, rent or share personal data, and we don't use your health data for marketing.
  • This website sets no tracking cookies and runs no analytics.

Payments

Linea Pro is sold through the App Store. Apple processes the payment and manages your subscription; we never receive your card or billing details. The app sends us Apple's signed purchase record (product, expiry and transaction ID) so Pro unlocks on your account.

Support and bug reports

If you contact us or send a bug report from the app, we store your email address, what you write, basic app and device details (app version, iOS version, device model, language) and any screenshots you attach, and use them only to help you. Reports never include your health logs. We don't add you to a mailing list.

Your choices: export and delete

  • Export: Settings › Export all data saves everything to a CSV file, free, any time.
  • Delete your account: Settings › Delete account permanently removes your account and every log, photo, AI permission and usage count from our servers, and clears your iPhone.
  • Sign out: syncs anything pending, then removes your data from that iPhone. Sign in again to restore it.
  • AI permission: withdraw it in Settings and no AI request is sent again until you agree.
  • Reminders: turn on discreet reminders, or switch them off, in Settings.

You can also ask us to access, correct or delete your data at support@uselinea.app.

How long we keep it

We keep your account data until you delete your account. Deletion removes it from our live database straight away; encrypted backups roll off within 30 days. Support conversations are deleted when they're no longer needed to help you.

Children

Linea is not directed to anyone under 18, and we do not knowingly collect information from children.

Changes to this policy

If this policy changes, we will update it here and move the effective date. If a change ever affected what we store or who processes it, we would tell you in the app before it took effect.

Contact

Questions about privacy go to support@uselinea.app.