Privacy Policy

Sinter is run by SBApplications LLC, a limited liability company in Florida, United States ("we", "us"). We decide why and how the data described here is used.

SBApplications LLC7901 4th St N, Ste 300St. Petersburg, FL 33702, United Statessupport@sinter.fit

We collect what the app needs to work, and nothing to sell or advertise.

Your account. Your email address, and a password that we keep only in hashed form (never the password itself). If you sign in with Google or Apple, it confirms your email address to us; the name and photo it may also send are not stored on our server. If you choose to share your first name with Apple, the app offers it as the name on your profile during setup, where you can keep or change it. We keep the sessions of your signed-in devices, without their IP addresses. We use this to let you in and keep your account safe.

Your profile and body figures. The name you give (a nickname is fine), sex, date of birth, height, activity level, units and language. Your weight, body fat, target weight and body measurements (waist, hips, chest, arm, thigh and neck) when you log them. We use these to work out your calorie and macro targets and your plans, and to show your progress. This is sensitive information, and we treat it that way: it is used to run the product and for nothing else.

Your training and food. Workouts, sets, notes and personal records; your plans, your own exercises, your goals and your answers to the plan builder; food and meal logs, saved meals, your own foods, your macro targets and the diet you follow. We use these to run the app for you.

Photos. There are two kinds, and they are treated very differently.

• Food photos. When you take a photo of a meal for a calorie estimate, the photo (and any description you add) is sent through our server to an AI service to produce the estimate. We do not keep it. Nothing is added to your log until you confirm it.
• Progress photos (front, side and back). They are kept on your phone only. They are never uploaded, never synced, and not in your data export. Deleting a profile deletes its photos from the phone; so does uninstalling the app.

Plan files. If you import a plan from a PDF, a photo or pasted text, the file or text is sent to an AI service to read it. We do not keep it. What you confirm after the preview becomes ordinary workout or food data.

Your subscription. Whether you are subscribed, which plan, and when it renews or ends. Your card number never reaches us: web payments are taken by Stripe, and store payments by the App Store or Google Play. In the iPhone and Android apps a subscription service also confirms store purchases for us; it receives your account identifier and the purchase details, never your email or any training, food or body data.

Apple Health and Health Connect. Off until you turn them on in the app, under your profile. When connected, Sinter reads workouts from your watch or other apps, weigh-ins and sleep (and, on iPhone, resting heart rate, heart rate variability, steps and body fat), and saves your workouts, meals, weight and body fat to them. What Sinter reads stays on your phone: it is not synced to our server, not sent to an AI service, and never used for advertising or marketing. Disconnect in the same place and Sinter stops and forgets what it read. Sinter's use of information received from Health Connect follows the Health Connect Permissions policy, including its Limited Use requirements.

Feedback and support. If you send feedback in the app, we keep the note with the screen it came from, the app version and the kind of device. If you write to support, we keep the email. If you delete your account, a feedback note stays, no longer linked to you.

Error reports and counts. When the app or our server hits an error, an error report is sent to a service that helps us fix bugs: what went wrong, where in the code, the screen you were on, the app version and the kind of device. It never includes your email, your name, or anything you logged or typed. We also count, as plain numbers with nothing that identifies you, how many people reach each step of sign-up and first setup. We count how much you use the AI features, per account, to apply the fair-use limit in the Terms.

Notifications. Off until you turn them on, in the iPhone and Android apps. If you turn them on, we hold your phone's push token. Rest alerts and reminders are worked out and shown on your phone from the logs on the phone; nothing about them is sent to us.

Our website. If you join the waitlist on sinter.fit, we keep your email address, when you joined, your invite code, how many friends joined with it, and a random mark your browser keeps (stored only as a hash). Our hosting provider keeps standard server logs, which include IP addresses, for a limited time. The website sets no advertising cookies.

Your workouts, food, weight, plans and profile are saved on your phone first, and the app works fully offline. While you are signed in, Sinter syncs a copy to our server so that your devices agree and a lost phone loses nothing. Sync runs whenever you are signed in, and there is no setting to turn it off. Your data is encrypted in transit and at rest, but sync is not end-to-end encrypted, which means we can read it. We read it only to run the service, to fix a problem you report, or if the law requires it.

Our servers and our database are in the United States. If you use Sinter from another country, your data is sent to and stored in the United States.

When AI builds a plan, your answers on the build form and anything you type in the note are sent to an AI service, with the profile details the plan needs: age (not your date of birth), sex, height, weight, training answers and your one-rep maxes. Your name, email and account identifier are not part of it. For a diet plan it also gets your target weight, latest body fat, activity level and training days. Food photos and plan files go the same way (section 2). A request goes to one AI service, and if that one cannot answer, the same request may go to a second. Plans can also be built on your phone with no AI, which is what happens when you are offline.

We do not use your data to train AI models. The AI services act on our instructions under their commercial terms for developers.

We share data only with providers who run parts of Sinter on our instructions and for no purpose of their own, and with the stores you buy through:

• payment providers: Stripe (web), and Apple or Google (the apps), plus the subscription service described in section 2;
• AI services, for the plans, photos and files described above;
• food databases, which receive only a barcode or the text of a food search, never anything that identifies you;
• providers that run our email, database, hosting, error reports and push notifications;
• when the law requires it, to respond to a valid legal request, or to protect the safety of people or our service;
• a buyer or successor, if Sinter or our company is ever sold or merged, on terms that keep this policy.

We do not sell or rent personal data. We do not share it for advertising. We do not combine it with other companies' data, and nothing in Sinter tracks you across other companies' apps or websites.

Synced data is kept while your account exists. Delete the account and your data is deleted immediately, with no waiting period.

What stays after a deletion, and why: a closed-account marker with your account identifier and nothing else, so that a sign-in token issued before the deletion cannot be used afterwards; feedback notes, no longer linked to you; and payment and tax records that Stripe, Apple or Google keep for their own legal duties. Subscription records held by the subscription service are removed when you ask us by email.

Export. In the app: You, tap Your data, Export my data. It is a file with your profile, workouts, food, weight, plans, goals and measurements. It is free, always available, and still works after a subscription ends. Progress photos are not in it, because they are not on our server: they stay on your phone.

Delete. In the app: You, tap Account, Delete account (at the bottom), then Delete permanently. Or open https://sinter.fit/delete-account, or email support@sinter.fit from the address you signed up with and we do it within 30 days and reply when it is done. Deletion removes everything you logged and everything derived from it, your plans, profile, subscription status, usage counts, push tokens, and your email and sign-in record. It cannot be undone. Export first if you want a copy.

A subscription bought on the web is cancelled before the deletion. One bought in the App Store or Google Play is not: cancel it there, or it keeps renewing.

You can see and correct most of your data in the app, export it, and delete it. You can also write to us at support@sinter.fit to ask for a copy, a correction or a deletion, and we answer within 30 days. We may need to confirm it is you.

Depending on where you live, the law may give you more, for example the right to know what we collect, to access, correct, delete or move your data, to withdraw consent, and to complain to an authority. In California and other US states with privacy laws: we do not sell personal information, we do not share it for cross-context behavioral advertising, and we use health information only to provide Sinter, and we do not discriminate against anyone who uses these rights. In the European Economic Area and the United Kingdom: we process your data to provide the service you asked for, with your consent for the health information you choose to enter, and for our legitimate interests in security, fixing bugs and the anonymous counts.

Sinter is for people 13 and older. The app asks for your date of birth and does not let anyone under 13 create a profile. Do not create an account for a child. If we learn that we hold data from a child under 13, we delete it.

We protect your data with encryption in transit and at rest, access controls, and by keeping what we collect small. No system is perfectly secure, and we cannot promise it. If we learn of a breach that affects you, we tell you and the authorities as the law requires.

If this policy changes in a way that affects what we collect or who sees it, we will say so in the app before it takes effect, and change the date at the top.

Questions, requests and complaints: support@sinter.fit, or SBApplications LLC, 7901 4th St N, Ste 300, St. Petersburg, FL 33702, United States.