Privacy Policy

What stays on your phone

Your meals, scanned products, photos you save to your record, the workouts you log, your weight, your age and sex if you turn on the daily reference, your answers from setup, your sleep check-ins, and your settings live on your device, and in your phone's own backup if that's on. We have no copy. Choosing Erase my record in the app removes your meals, products, photos, workouts, weight, daily reference answers and sleep check-ins. With Add meals to Apple Health on, it removes the meals Haku added there too.

Deleting the app removes what's on your phone, including your setup answers and settings, but it can't reach iCloud. If you use Friends, choose Erase my record or remove your friends in Haku first. Plates left behind stay in the shared space until its owner's Haku clears them, a month on. Anything left in your own iCloud can be cleared in Settings, under your name, then iCloud. A small key for sharing sleep and activity can stay in your phone's keychain after the app is gone. It holds no sleep or activity numbers.

Friends, if you use it. When you invite a friend, Haku opens a shared space in your iCloud, and the people you invite join it from their own iCloud. Each person in it shares their meals from the last 14 days there: the name Haku calls them, each meal's name, the meal of the day and the time, its score and what it was made of, and a small copy of the photo if Plate photos is on. Friends can leave a cheer on a plate. All of this goes between your iCloud and theirs through Apple's CloudKit. We run no server for it and cannot see it. Plates older than 14 days come off when your app next syncs, and the shared space clears anything a month old. Products you scan are never shared, and your sleep and activity numbers never go through iCloud. You can pause sharing, turn off plate photos, or remove a friend at any time in Haku.

Widgets and Apple Watch. Widgets and the Apple Watch app show today's score, calories, protein, carbs and fat, your meal names, and your daily reference if you turned it on. These stay on your own devices and pass between them through Apple's system, never through our servers.

Apple Health. If you connect Apple Health, Haku reads your sleep, heart rate variability, resting heart rate, breathing rate and wrist temperature, only to show how your body is today, and your workouts, active energy, steps and weight, only to show what each day burned, your weight trend, and what moves your sleep. If you turn on Add meals to Apple Health, Haku writes each meal's name, calories, protein, carbs, fat, fiber and sodium there, and nothing else. Removing a meal in Haku removes it from Health too, once the switch is on, and turning the switch off leaves what's already there. Haku never sends Health data to iCloud itself, never keeps it on our servers in a form we can read, never uses it for advertising, and never sells it. One number stays in your record: your current weight, which can come from Health. It stays on your phone, and if iCloud Backup is on, your phone's backup carries it with the rest of your record. Health numbers can leave your phone in three ways, all your choice: the AI morning note and sharing with friends, each described below, and Export for your doctor, a PDF and a CSV made on your phone that go only where you send them. You can change what Haku reads and writes at any time in Settings, then Health, then Data Access.

What leaves your phone, and why

• Photos you choose to read. When you scan a meal or a label with the camera or pick one from your photos, the app sends that single photo, and any note you type with it, to our reading service, which asks Claude, an AI model made by Anthropic, to identify the food, translate the label, and read the nutrition panel. For packaged products, the reader may use Anthropic's web search to look up the product's published ingredients and nutrition. Our service keeps no copy of your photo and returns only the reading. Anthropic does not train its models on your photos. It deletes them within 30 days, unless a photo is flagged for a safety review, in which case it may keep that photo longer. The app asks your permission before it sends the first photo.
• Meals you type. When AI reading is on and you type a meal, or add a food while fixing one, the app sends those words to the same reading service, which asks Claude to estimate the foods, portions and nutrition. Our service keeps no copy of the words and returns only the estimate. Anthropic treats them as it treats photos. With AI reading off, typed meals are worked out on your phone, and your words leave it only if you tap Search packaged foods.
• Recipes from a link. When you paste a link to a recipe, your phone opens that page itself, the way a browser does, so the site sees a normal visit. When the page gives no nutrition numbers and AI reading is on, the app sends the recipe's words, or the page's text, to the same reading service, which asks Claude to estimate one serving. The link itself isn't sent. Our service keeps no copy and returns only the estimate. Anthropic treats them as it treats photos.
• Sleep and activity you share with friends. Only if you turn on Share my sleep or Share my activity. Your phone seals those numbers with a key, then passes them through our service, which never gets the key, can't read them and deletes them after three days. The key travels in the iCloud table you share with those friends. The numbers themselves are never stored in iCloud. Turn the switch off and they're deleted from our service.
• Angles on a meal. When AI reading is on and you open an angle on a meal (biohacking, Ayurveda, washoku or gut health), the app sends that meal's name, its foods with their portions and nutrition numbers, the time of day and the season to the same reading service, which asks Claude to write that view. No photo is sent. Our service keeps no copy and returns only the view. Anthropic treats it as it treats photos.
• Cooking from your fridge. When AI reading is on and you ask Haku what to cook, the app sends the foods you list, your messages in that chat, the names and food groups of today's meals, which meal is next, your cooking time and the foods you avoid to the same reading service, which asks Claude to suggest three meals. Only if you turned on the AI morning note does it also send today's workout and how long you slept last night. Our service keeps no copy and returns only the meals. Anthropic treats them as it treats photos. With AI reading off, the meals come from Haku's own recipes, worked out on your phone.
• A morning sleep summary. Only when you turn on the AI morning note. Each morning, and again after a new check-in, up to four times a day, the app sends a short summary of numbers to the same reading service, which asks Claude to write your note for the day: hours asleep, time in each sleep stage, your bedtime and wake time, your averages for the week, the latest HRV, resting heart rate, breathing rate and wrist temperature with your usual values, the day's body score and any caution, how you felt on waking, how much sleep you need, and your answers about how you sleep. It carries the weekday and the time. No name, no calendar date and no raw Health records are sent. Our service keeps no copy and returns only the note. Anthropic treats it as it treats photos. With the AI morning note off, the note is written on your phone, and nothing goes to the reading service for it. The morning note has its own switch, separate from AI reading for meals.
• Barcodes. When the camera reads a barcode, or you type one, the number is sent from your phone to Open Food Facts, a free public food database, to look up the product.
• Packaged food searches. When you tap Search packaged foods, the words you typed go from your phone to Open Food Facts to find the product. This has nothing to do with AI reading, and happens only when you tap.
• A random install number and your time zone. The app creates a random number when you first use the reader and sends it with each reading, so we can keep daily reading limits fair. It is tied to nothing about you. Our service keeps a count against it for 48 hours, then the count is deleted. The app also sends your phone's time zone offset, so those limits turn over at your midnight.
• Your IP address. Our reading service runs on Cloudflare. Cloudflare processes your IP address to deliver each request and to limit abuse, such as one address sending too many photos. Cloudflare keeps logs of some requests for up to 7 days so we can fix problems, then deletes them. These logs can include your IP address and install number. They never include your photo. Barcode lookups and packaged food searches go straight from your phone to Open Food Facts, which sees your IP address and what you looked up.

Anthropic and Cloudflare process this data only to provide the service, under terms that protect it at least as well as this policy. Open Food Facts is an open public database, not a company working for us: we have no agreement with it, and what you send it falls under its own privacy policy.

Your choices

To stop sending photos, typed meals, recipes, angles and what's in your fridge, turn off AI reading in Profile. To stop sending sleep summaries, turn off AI morning note in Profile. The app will ask again before it sends another photo. Barcodes and packaged food searches go only when you use them, so to send nothing to Open Food Facts, leave them unused. To ask us to delete anything we hold about you, write to support@hakuhealth.com. Everything we hold is deleted on its own within 7 days.

Purchases

Memberships and free trials are handled entirely by Apple through the App Store. We never see your name, email, or payment details. You can manage or cancel your membership in your App Store account settings.

What we never do

We store nothing about you beyond the short-lived read count, the sealed numbers you share with friends, and the request logs described above. We sell nothing about you, share nothing for advertising, and track you across no apps or websites.

Health information

Scores and notes in haku health are general information on food, movement and sleep. Most draw on public guidance, and our sources page says where they don't. Meal scores describe food, never people. Sleep readings are a reference for the day, never a diagnosis, and they are no substitute for advice from a doctor or dietitian.

Children

haku health is meant for adults and is not directed at children under 13.

Changes

If this policy changes, the new version will appear on this page with a new date.

haku health is published by startup ui.

Contact

Questions about privacy: support@hakuhealth.com