Your data is yours.

The short version

weyt.ai keeps what you give it to run the app: your account, your answers at sign-up, the workouts you build and the sessions you log. The coach is an AI made by Anthropic. Once you agree in the app, your profile, your training and what you write to the coach are sent to Anthropic so it can write the coach's words. Photos and screenshots you ask it to read are sent there too, and thrown away after reading. There are no ads, no tracking across apps or websites, and nothing is sold. You can delete your account, and everything in it, from Settings at any time. weyt.ai is for adults, 18 and older.

What is collected

• Your account: your email address, the name you give, and the date you joined. With an email sign-up, a scrambled (hashed) version of your passphrase, never the passphrase itself. With Google or Apple, the email address and the first name they share with us, and which of them you used. Their photo of you is not kept. With Apple, also the sign-in token Apple gives us, stored encrypted, so that deleting your account can tell Apple to end weyt.ai's access. A public @name, if you pick one.
• Your answers at sign-up and in Settings: your goal, how long you have lifted, the standards you chose (men's, women's or combined), your age (stored as a birth year), what you train with, your units and days a week, your time zone (read from your device), and, if you give them, your bodyweight and a bench or squat set.
• Your training: the workouts you build and the sessions you log (exercises, sets, reps, weights, times, distances, a heart rate when you typed one or a screenshot showed one, calories when a screenshot showed them, an estimate of calories, notes, dates and the time you logged them), and everything worked out from them: your numbers, PRs, plaques, the weights for next time and the coach's reads.
• Photos and screenshots you choose: when you ask weyt.ai to read a workout from a photo, or a run from a screenshot, the picture is sent to be read and then thrown away. It is never stored. Only the lifts or the run figures read from it are kept, and only if you save them.
• The coach: your conversation is kept on your device only while the app is open. Each message sends the conversation so far to our server to be answered. The messages you type are also saved in our logs, so problems can be fixed, and deleted after 48 hours. When you ask the coach to build or change a workout or log a session, that change is stored like anything you enter yourself.
• Your agreement to AI data sharing: that you agreed, and when.
• Shared workouts: when you share a workout, its name, your note, its lifts with their sets and reps (or times), how hard each set is as a share of your best, any lifts you named yourself, your @name, and how many people added and trained it are public. Your weights are not shown. Reports you file are stored so they can be reviewed.
• In the iPhone app: if you allow notifications, your phone's notification token and when it was last used. It is removed when you log out (if the phone is online) and always when you delete your account. If you subscribe, the app passes Apple's signed receipt to weyt.ai, which keeps your plan, the date the current period ends, Apple's transaction number, and when it was last checked. So that one subscription gives Pro to one weyt.ai account, the app gives Apple a random account code with the purchase, and weyt.ai keeps which account each subscription belongs to and when it last moved between accounts, until you delete your account. Apple also tells weyt.ai directly when the subscription renews, fails to renew, is turned off, ends, is refunded or is cancelled by Apple; weyt.ai keeps the latest of these (what happened and when) with your account, and a short record of each one in its logs. Your card details stay with Apple and are never seen by weyt.ai. weyt.ai does not read or write Apple Health.
• Crash reports from the iPhone app: when the app crashes or freezes, it sends a short summary the next time it opens: the app's version, the iOS version, the iPhone model, the kind of crash and where in the app's code it happened (code positions only). It holds nothing you typed or saw on the screen and no file names, and it is tied to your account because it is sent while you are signed in. It is used only to find and fix the problem, never to track you. Apple's own crash reports, if you choose to share them with developers in iPhone Settings, are separate and come from Apple.
• Logs: which features are used, how much AI text was written and what it cost, timings and errors, to keep the app working and its costs in check. To limit repeated tries, an internet (IP) address is kept for a short time when someone signs in (failed tries only), signs up, asks for a login or reset link, uses the public tools, loads the home page, or when the browser reports a part of a page it would have refused; for newer (IPv6) addresses only the first half is kept. Visits to the public home page are recorded with the visitor's IP address and the page they came from, not tied to any account. Your browser also keeps a random number, with no name or IP address in it, that ties together the steps from the home page to signing up or logging in.

What is sent to Anthropic

The coach is an AI made by Anthropic. The app asks you to agree before anything is sent, and sends nothing until you do. Agreeing is required to use weyt.ai; to stop, delete your account. This is what each feature sends:

• The coach's replies, when you message it: your first name, age, the standards you chose, bodyweight, goal, experience, equipment, units and days a week; your workouts and the sessions you logged (lifts, sets, reps, weights, runs, dates, the time of day you logged them, an estimate of calories, and a run's average heart rate when you typed one or a run screenshot gave one); the notes you wrote on workouts and sessions; your numbers (your standing, lifting age and PRs); and the conversation itself.
• The coach's reads: the same summary of your profile, training and notes, plus the previous read. These are written on their own, without you asking: after a workout, when you open Today and a read is due, and on Sundays.
• The monthly read: your first name, the days you trained that month, your lifts and PRs, your standing, and when in the day and the week you train. It is written on its own on the 1st.
• Design with coach: your age, standards, bodyweight, goal, experience and equipment, your recent lifts, the names and notes of your workouts, and what you asked for.
• Your first workout at sign-up: your sign-up answers and any lifts you gave.
• Reading a photo or a screenshot: the picture itself. The app redraws it before sending, which drops hidden details such as where it was taken. It is never stored.
• Sharing a workout: its name, note and lift names, checked for abuse before it goes up.

Your email address and your passphrase are never sent. The reference numbers weyt.ai gives your workouts and sessions are included, so the coach can change the right one.

Anthropic handles this under its commercial terms. It does not use it to train its AI models. It deletes it within 30 days, unless it is flagged for breaking Anthropic's usage rules, which can be kept for up to two years, or the law requires keeping it.

Who else handles your data

weyt.ai runs on a few providers. Each one gets only what its job needs.

• Vercel runs the website and the app's server in the United States and keeps short request logs. It also counts page views, on the website and in the app, without cookies and without anything after the “?” in an address (Vercel Web Analytics). On the website it also checks, without showing you anything, that a sign-up or a request for an emailed link comes from a person and not a program (Vercel BotID).
• Supabase hosts the database, in the United States, where your account and training live. Only weyt.ai's own server can read it.
• Anthropic writes the coach's words, as above.
• Resend sends the login links and passphrase resets you ask for, so it receives your email address. It also delivers a daily usage summary to weyt.ai's owner, which names new members (name and email) and lists the workouts members logged that day by first name.
• Google signs you in when you choose Continue with Google.
• Have I Been Pwned checks that a new passphrase has not appeared in a public data leak, when you sign up or reset it. Only the first five characters of a scrambled form of the passphrase are sent, never the passphrase itself or your email.
• Apple signs you in when you choose Continue with Apple, delivers notifications to your iPhone, and handles subscriptions, payments and refunds in the iPhone app. When you sign up or ask for an emailed link in the iPhone app, Apple also confirms that the request comes from the real weyt.ai app on a real iPhone (App Attest). Nothing about you is in that check, and weyt.ai keeps nothing from it.

No ads, no tracking, no selling

weyt.ai shows no ads, uses no advertising or tracking tools, does not track you across other apps or websites, and does not sell, rent or trade personal data.

Cookies and storage on your device

A few cookies from the sign-in system keep you signed in (for up to 30 days) and protect the sign-in form. There are no advertising or tracking cookies. The app keeps a few things in your browser's storage so it opens fast and nothing is lost: the screens you last saw, a workout in progress (so a reload does not lose your sets), your set-up answers until set-up is done, your appearance setting, and in the iPhone app your notification token. Logging out clears them. Separately, the random visit number described under Logs stays until you clear your browser's storage.

How long it is kept

A cleanup job runs every night to keep these true.

• Your account, answers and training: until you delete your account.
• The Apple sign-in token (only if you continue with Apple): until you delete your account, when it is sent back to Apple to be cancelled and then deleted.
• The messages you type to the coach, in our logs: deleted after 48 hours.
• Login links and passphrase reset links: they work once, for 15 minutes, and are deleted within a day of expiring or being used.
• Limit records (an IP address, or your account's number for the coach's limits): deleted once their time window has passed, from 5 minutes to 30 days depending on the action.
• Home page visits and sign-up step records: after 90 days the IP address and any browser details are removed and the page the visitor came from is cut to the site's name, so only counts remain.
• Records that stop a workout being saved twice: deleted after 7 days.
• Reports from your browser when it would have refused part of a page (which kind of part, the site it came from and the page, nothing about you): deleted after 30 days.
• Crash reports from the iPhone app: deleted after 30 days, and sooner if you delete your account.
• Apple's messages about your subscription (what happened and when): with your account until you delete it. A message about a subscription no weyt.ai account holds keeps only what happened, not who.
• Feature, cost and error logs tied to your account: until you delete your account. Records left behind by an account that no longer exists are deleted after 30 days.
• What is sent to Anthropic: deleted by Anthropic within 30 days, as described above.
• The daily usage summary: kept in the owner's inbox.
• After a deletion, copies can remain in the database provider's backups for about a week, until those backups are replaced.

Deleting your account

Settings → Account → Delete account. You type DELETE and confirm with your passphrase. If you logged in with Google, Apple or an emailed link, you confirm by having logged in within the last ten minutes (the app asks you to log in again if not). Deletion is permanent: your workouts, sessions, numbers, coach reads, settings, notification tokens, the logs tied to your account and your account are removed, which frees your email address and @name. If you signed in with Apple, weyt.ai first asks Apple to cancel its sign-in for weyt.ai. From the moment you confirm, the account is signed out everywhere and cannot be logged in to again. If a part of the deletion fails, the app says so and the rest finishes on its own within a day.

Workouts you shared stay public at their links, with their name, note and lifts, shown as from a “Former member”. Unlist a share first if you want it gone. Deleting your account does not cancel an Apple subscription; cancel that in iPhone Settings. What was already sent to Anthropic is deleted by Anthropic within 30 days.

You can download your training log yourself: on the website, open Settings, then Account, then Download my data. For a copy of anything else in your account, or to have your account deleted if you cannot log in, email support@weyt.ai from the address on the account.

If you use weyt.ai without an account

The Weyt Age calculator, the public API and the tool for AI assistants work out your number from what you enter (sex, age, bodyweight, a bench or squat set) and do not store it. Your IP address is kept for a short time to limit repeated use.

Age

You must be 18 or older to use weyt.ai. It is not meant for anyone under 18 and does not knowingly collect their data. If you believe someone under 18 has an account, email support@weyt.ai and it will be deleted.

Security

Passphrases are stored only scrambled (hashed) and must be at least 10 characters. Sign-in and sign-up attempts are limited to stop guessing. Reset and login links are single-use. All traffic is encrypted (HTTPS). weyt.ai is built by one person; it is not certified to a formal security standard, and there is no email verification or two-step sign-in yet. Changing your passphrase does not yet sign out your other devices; to do that, email us.

Changes

When this policy changes, the date at the top changes with it. If what is sent to Anthropic changes, the app asks you to agree again before sending anything more. For other important changes, we will email the address on your account.

Who runs weyt.ai

weyt.ai is run by one person, Daniel Rhinehart, in the United States. The iPhone app is offered in the United States only. Your data is stored and processed in the United States.

Contact

Questions about this policy, or a request about your data: email support@weyt.ai. See also the terms of use and the about page.