Katori

Katori privacy policy

For wellmosphere.com/katori/privacy. Last updated: 12 October 2026.

Katori is made by Wellmosphere. This page says plainly what happens to your information.

The short version

  • Your meal log, body details, targets, weight and saved foods stay on your phone.
  • There’s no account, no ads, no tracking across apps, and we never sell anything.
  • Photos, and words the app can’t match on your phone, are sent to identify the food. We don’t keep them, and the AI service deletes them within 30 days.

What stays on your phone

Everything you enter lives on your device. The few things that leave it are listed in the next section.

  • age, sex, height, weight, activity, diet and goal;
  • your daily targets;
  • meals, weigh-ins, saved dishes and your own foods;
  • reminder times.

We can’t see this information. Deleting the app, or using Settings › Privacy and your data › Delete everything, removes it.

What leaves your phone, and why

Food identification. When you log by photo, or type something the app can’t match on the phone:

  • the photo (shrunk to 768 pixels, with location and camera details removed), any note, the text and your diet setting (say, vegetarian, so suggestions fit what you eat) go to our server, which runs on Cloudflare, along with the app’s random install ID and version;
  • the server passes them to Anthropic’s Claude to name the dishes and estimate portions;
  • the answer comes back to you to check;
  • we don’t store photos or text, and we don’t log them. Anthropic processes them under its commercial terms, doesn’t use them to train its models, and deletes them automatically within 30 days (it can keep content flagged for misuse for up to two years).

Keeping the service fair. Each install has a random ID, made on your phone and not linked to your name, email or device identifiers. It’s used to count free photos and daily AI help, and the count of free photos used is kept with it for good, so it can’t be reset. On iPhone, Apple’s App Attest confirms requests come from the real Katori app (our server keeps each install’s App Attest key so it can check later requests), and Apple’s DeviceCheck lets us mark a phone that has used its free photos, so reinstalling the app doesn’t reset them. DeviceCheck stores two yes-or-no values with Apple for this app and phone; it doesn’t identify you, and we can’t see any other device information. Our server keeps a scrambled (hashed) form of your IP address for up to two days, to stop abuse. It also keeps a fingerprint of each photo (not the photo itself) for a day, so sending the same photo again with a note isn’t counted twice. Daily counts of AI help are kept for two days. We log only technical facts per request: which feature, how long it took, and the cost. We never log your food, photos or IP address.

Subscriptions. If you subscribe to Katori Pro, Apple (or Google) handles payment. RevenueCat tells the app whether Pro is active, using an anonymous ID. RevenueCat receives your purchase history and basic app and device details (such as the iOS version, device model, language and app version) to manage the subscription; see revenuecat.com/privacy. Our server checks that same anonymous ID with RevenueCat so Pro’s photo limits apply, and remembers which app installs it was used from (no more than three at a time; an install unused for 30 days drops off) so it can’t be borrowed. We never see your card or store account details.

Reminders are scheduled on your phone by your phone. Nothing is sent.

Export (Katori Pro) makes spreadsheets of your meals and weigh-ins on your phone and hands them to the share sheet. Nothing goes to us; you choose where they go.

Your choices

  • Delete: Settings › Privacy and your data › Delete everything clears your log and settings from the phone. Nothing about your meals is held anywhere else. The app keeps its random install ID, and our server keeps the free-photo count and App Attest key tied to it, so deleting doesn’t reset the free photos.
  • Photos: typing always works, and you never have to use the camera.

Children

Katori is for adults aged 18 and over.

Health information

Katori gives estimates to guide you, not medical advice.

Changes and contact

If this policy changes, the new version will be posted here with a new date. Questions: hello@wellmosphere.com.

See also: Katori support