Privacy Policy

Last updated: October 4, 2026

Overview

Terrain Health (“we,” “our,” or “us”) makes Terrain, a daily rituals app for iPhone, and this website (together, the “Service”). This policy explains what the Service collects, where it is kept, who else receives something, and how to delete it. In the app, You → What Terrain knows lists the same things.

In short: Terrain works on your iPhone first. Without an account, what you tell Terrain stays on your device. An account, location for the weather and notifications are optional. Your daily read is worked out on your iPhone, and nothing you tell Terrain is sent to an AI service. We do not sell your data, show ads, or track you across other companies' apps.

What Terrain Keeps

Your Check-ins and Reads

  • How you feel each day (Drained, Steady, Can't settle or Foggy) and, if you add them, last night's sleep and your mood, each on a scale of 1 to 5
  • Each day's read, the option you chose and whether it sounded right
  • The rituals you begin and mark done, how many minutes they took, and your evening answer
  • The day's weather condition and temperature, if you allowed location (never the location itself)

Your Profile

  • Your quiz answers and the terrain type and modifier they produce, and your seasonal re-check answers
  • Your goals, and your lifestyle answers (how often you drink alcohol, and smoke or vape)
  • Your age (18 and over) and gender, only if you give them; both are optional
  • The ingredients in your cabinet, and whether reminders are on and at what times

Your Account (Optional)

  • With email sign-up: your email address
  • With Sign in with Apple: the identifier Apple gives us and the email Apple shares, which may be Apple's private relay address; we never receive your Apple Account password
  • A first name, if you give one or Apple shares one
  • An account ID that ties your synced data to you

Who Else Receives Something

We share data only with the services that run Terrain, and only what is listed here.

  • Supabase (our backend) stores your account and, when you are signed in, a copy of everything listed above, so it can sync across your devices. Each account can read only its own data. See Supabase's privacy policy.
  • Amplitude (analytics) receives which parts of Terrain you use: the screens and items you open, the read option you choose and whether it sounded right, your evening answer, whether a re-check or re-quiz changed your terrain, and purchases. With them go your terrain type and modifier, whether reminders are on, basic app and device details, a device identifier and, when you are signed in, your account ID. Amplitude's SDK also sends Amplitude notes on how the SDK itself is running, such as errors it hit, and can send crash reports, which carry basic app and device details and no account ID. Amplitude never receives your check-in, quiz or goal answers, your age or your gender. Terrain does not record your screen, and it asks Amplitude not to keep your IP address or look up where you are.
  • Superwall (subscription status) receives your terrain type, nickname and modifier, whether onboarding is done, whether Terrain Pro is active, the app opens and sessions it records itself, and notes on errors its SDK hits. With them go basic app and device details, your IP address and the approximate area it points to (city, region and country) and, when you are signed in, your account ID.
  • Apple handles purchases and subscriptions (StoreKit); Terrain learns whether Terrain Pro is active, never your payment details. If you allow location, your approximate location goes to Apple Weather (WeatherKit) each time Terrain looks up the day's weather. Apple also provides Sign in with Apple and notifications. See Apple's privacy policy.
  • Vercel hosts this website and records standard website analytics (pages visited, browser and device type, referring page).

What Terrain Does Not Collect

Terrain does not read health measurements from other apps or devices, does not use the camera or the microphone, does not keep your location, and does not send what you tell it to any AI service. Nothing is used for advertising, and nothing is sold.

How We Use It

  • To choose your read, recipes, movement and ingredient picks for your terrain, the season and the time of day
  • To sync your data across your devices when you are signed in
  • To unlock Terrain Pro when you subscribe
  • To understand which parts of Terrain are used, and to keep it reliable
  • To answer you when you write to us

Where It Is Kept, and for How Long

  • On your iPhone, in the app's private storage, for as long as the app is installed
  • In Terrain's cloud (Supabase), only when you are signed in, until you delete your account; it is encrypted in transit
  • Signing out clears Terrain's data from that iPhone; it stays in your account, and signing back in brings it back
  • Analytics events are kept under Amplitude's and Superwall's retention settings

Your Choices

  • Use Terrain without an account
  • Decline location and notifications, or turn them off later in iOS Settings
  • Delete your account in the app (You → Settings → Delete account). It deletes your account and everything synced to it from Terrain's cloud. If you use Sign in with Apple, you can also remove Terrain from your Apple ID in iOS Settings, under your name, then Sign in with Apple
  • Email us to ask for a copy of your data, or for the analytics records tied to your account to be deleted

Website Waitlist

If you join the waitlist on this website, we keep your email address in our Supabase database to tell you when Terrain launches. Write to us to be removed.

Children's Privacy

Terrain is not directed to children under 13, and we do not knowingly collect personal information from them. The app's optional age field starts at 18.

Changes to This Policy

When we change this policy, we update the date at the top of this page.

Contact

Questions about this policy: support@terrainhealth.app.