Privacy Policy
Last updated 6 November 2026
This policy explains what Fatlow collects, why, who helps us run it, and what you can do about it.
- No ads, no tracking across apps, and we never sell your data.
- Apple Health is read only. We never write to it and never use it for advertising.
- AI features use Anthropic's Claude models, and only after you give permission.
- You can delete your account and all linked data in the app at any time.
Who we are
Fatlow is an iOS app made by Ivan Anishchanka, an independent developer. In this policy, "we" and "us" mean Ivan Anishchanka, who is responsible for your personal data in Fatlow.
Contact: ollo.manage@gmail.com
Fatlow is for adults
Fatlow is for people aged 18 and over, and the app has an age check before you start. We do not knowingly collect data from anyone under 18. If you think someone under 18 is using Fatlow, email us and we will delete the account.
What we collect
Everything in this section is linked to your account.
Account
When you sign in with Apple or Google, we receive your name and email address. If you choose Apple's option to hide your email, we receive a private relay address from Apple instead of your real one.
Guest preview lets you look around the app before you sign in.
Profile and body
Your sex, date of birth, height, weight, goal weight, activity level and goal, plus the weigh-ins you log, and a profile photo if you add one.
Safety answers
The answers you give about allergies, your diet (including religious diets such as halal or kosher) and health conditions such as pregnancy, diabetes, kidney disease, high blood pressure or an eating disorder. This is sensitive information. We use it so the coach can take it into account when it makes suggestions for you.
Meals, photos and chats
The meals you log, your food photos, and your chat messages with the coach.
Notifications
If you allow notifications, we keep a push token for your device and its time zone with your account, so we can send the reminders and workout messages you chose. You can turn them off in Profile > Notifications or in iOS Settings.
Feedback
Feedback messages you send from the app, together with a random device id.
Subscription status
We receive whether your subscription is active from Apple and RevenueCat. Apple handles payment, so we never see your card details.
Apple Health
With your permission, Fatlow reads the following from Apple Health (HealthKit):
- steps
- active energy
- resting (basal) energy
- workouts
- sleep
- weight
- height
- date of birth
- biological sex
Fatlow only reads this data. It never writes anything to Apple Health.
We use it to estimate how much energy you burn each day and how your body fat changes, and we show it to the in-app coach.
iOS can also wake Fatlow in the background when new data, such as a workout, reaches Apple Health, so your day stays up to date and we can tell you about the workout.
The figures read from Apple Health are stored on our servers with your account, so your history and the coach work on any phone you sign in on. They are kept until you delete your account.
Apple Health data is never used for advertising or marketing, never sold, never shared with data brokers, and never stored in iCloud by us.
You can turn access off at any time in iOS Settings > Health > Data Access & Devices.
AI features
Fatlow's coach and food reading run on Claude models from Anthropic. To read your food and write the coach's replies, we send Anthropic:
- your messages to the coach
- your food photos
- your body figures and goal: age, sex, height, weight, weigh-ins and your plan
- your safety answers
- figures derived from your Apple Health data: burn, steps, workouts and sleep
The app asks for your explicit permission before the first time it uses AI. You can withdraw it at any time in the Profile, and AI features then stop.
We do not use your data to train AI models ourselves. Anthropic processes it to provide the service, under its own terms.
How we use your data
- To run your account and keep your profile, logs and history.
- To estimate your daily energy burn, your intake and your fat change.
- To power the coach and food reading, once you allow AI.
- To read and answer your feedback and emails.
- To manage your subscription.
We do not show ads, we do not track you across other apps or websites, and we do not sell your data.
Who helps us run Fatlow
These companies provide parts of the service:
- Vercel: hosts the app server
- Supabase: database and file storage
- Railway: infrastructure
- Anthropic: AI (Claude models)
- Apple: Sign in with Apple, App Store payments and push notifications
- Google: Google sign-in
- Expo: delivers app updates and push notifications
- RevenueCat: subscription management, and Apple's AdServices attribution token, so we can see which Apple Ads campaign led to an install. It does not identify you and is not used to track you across other companies' apps or websites.
These providers process data in the United States and other countries. Where data leaves your country, the transfer relies on the providers' standard contractual clauses or an equivalent safeguard.
Why we are allowed to use it
- To provide the service you signed up for: your account, profile, logs and subscription.
- Your explicit consent: Apple Health data, your safety answers about health and diet, and sending data to the AI. You give it in the app and can take it back at any time.
- Our legitimate interest: keeping the service secure and answering your support messages.
How long we keep it
We keep your account data until you delete your account.
To delete it, go to Profile > Account > Delete account in the app. This erases your account and all linked data from our database immediately. Copies in our backups roll off within 30 days.
You can also email ollo.manage@gmail.com to ask for deletion or for a copy of your data.
Your rights
You can ask us to:
- Access: tell you what data we hold about you.
- Correction: fix anything that is wrong.
- Deletion: delete your data.
- Export: give you a copy of your data.
- Withdraw consent: stop a use you agreed to. You can switch off AI features in the Profile and Apple Health access in iOS Settings yourself.
Email ollo.manage@gmail.com to use any of these.
EU and UK: these are your rights under the GDPR and UK GDPR. You can also object to some uses of your data or ask us to limit them.
California: you have the right to know what we collect, to delete it and to correct it. We do not sell or share your personal information, and we will not treat you differently for using your rights.
Complaints: if you are unhappy with how we handle your data, please tell us first so we can put it right. You also have the right to complain to the data protection authority where you live, for example the ICO in the UK.
Changes to this policy
If we change this policy, we will post the new version on this page and update the date at the top.
Contact
Ivan Anishchanka, ollo.manage@gmail.com