Delete Your JST Fitness Account

Last updated: 17 October 2026

What changed on 17 October 2026. This page now also says that deleting your account cannot recall words our AI tools have already read, that our host's server logs outlast a deletion, and that email you sent us stays in our support inbox.

This page explains how to permanently delete your JST Fitness account and the data that goes with it. It applies to your account whichever version of the app you use — every version shares one account.

This document names the app's buttons and settings as they read in English.

Delete from inside the app (fastest)

1. Open JST Fitness and sign in.
2. Go to Profile → scroll to the bottom → Delete Account.
3. Type DELETE to confirm.

Deletion happens immediately. There is no grace period, and a deleted account cannot be restored. If you want to keep your data, use Profile → Backup & Restore → Back Up Data first; the backup file stays on your device and belongs to you, and it includes your saved routes.

If you can't sign in

Email privacy@jstfitness.com from the email address on the account, with the subject line "Delete my account". Anyone can put someone else's address on an email, so we never delete an account on the strength of the email that asks: we write a new email to the address the account is registered with, and delete the account once you answer it. We write within 30 days of your request, and a request sent with the app's Send Feedback is checked the same way. If the account's address was never checked as yours (by a confirmation email or a Google sign-in), or you can no longer get into that inbox, we cannot tell that the request is yours, so we tell you that rather than delete the account.

What gets deleted

• Your account and sign-in credentials.
• All synced data on our servers: weights, workouts, routines, custom exercises, measurements, meals, goals, achievements, streaks and profile details.
• Any feedback you sent with your email address attached, including that address.
• Crash diagnostics linked to the devices that feedback came from.
• The app's local copy of your data on the device you delete from.

What is not deleted, stated plainly

• Some feedback you sent without your email address. Every feedback message carries the device's diagnostic id even when your email doesn't, so if any other message from the same device did carry your email, the deletion sweep follows that link and removes the email-less ones too. What genuinely survives is narrower: a message from a device that never sent identified feedback. Nothing in the message ties it to your account; while our host keeps its request logs, the request that sent it carries your account's id if you were signed in, and we never use them to connect messages to people. Email us a description if you want a specific one removed.
• Copies in our encrypted backups, for up to 14 days. We keep a daily encrypted copy of account records — your sign-in email address, name, profile-photo link and details, your plan record, and our support tickets, which can hold a copy of a feedback message you sent and our notes about it — so that a server failure cannot lose everyone's account. Each copy is deleted once it is 14 days old, so anything deleted with your account is gone from them within 14 days, and a restore is never used to bring back a deleted account. Nothing you logged or synced is ever in them, except a food you chose to share, which is part of the shared list.
• Words our AI tools have already read. If we worked on a message or crash report you sent with Anthropic's tools, deleting your account cannot recall what was sent; Anthropic's own terms decide how long it keeps it.
• Your requests in our host's server logs. Every request the app makes, a sign-in included, passes through our hosting provider's routine server logs, which record your IP address and, once you are signed in, your account's id; a sign-in also records your email address. Deleting your account cannot remove them; Supabase deletes them on its own schedule, not ours.
• Copies already on your other devices. We have no way to reach out to a phone or laptop and erase it. Once the account is gone those devices stop syncing, but whatever was already downloaded stays until a different account signs in there, you uninstall the app, or you clear its data. Signing out alone does not remove it. A route you recorded with Track route was never downloaded anywhere: it lives only on the phone that recorded it, and on any phone you restore your backup file onto, which deleting by email cannot reach, so delete your account from inside the app on that phone, or uninstall the app there, to remove it.
• Crash diagnostics that were never linked to feedback of yours. They carry no name and no email address, and nothing in them ties them to your account; while our host keeps its request logs, the request that sent one carries your account's id if you were signed in, and we never use them to connect reports to people. They do carry the same per-device diagnostic id described above — so they are pseudonymous rather than anonymous, and we describe them that way. Reports age out and are deleted after 30 days regardless.
• A record that your email address has already had its free trial. Not the address itself — a one-way keyed hash of it that cannot be turned back into an email, holds no name and no fitness data, and answers only "has this address had a trial before?" It exists so that deleting an account and signing up again cannot be used to start the free trial over. It is deleted after 400 days.
• A food you chose to share. If you added a food to the food list and switched sharing on for it, the entry — the product's name, brand, serving, barcode and its calorie, macro, fibre and sugar figures — stays in every user's food list, because other people's logs may already use it and because sharing dedicated it to the public (Terms, section 9). What deletion removes is the private link between the entry and your account: afterwards nothing on our servers connects that food to you. It never carried your name, your email or anything from your log in the first place, and never the food's sodium or a drink's alcohol, which stay in your own list and go with your account.
• A report you made about a shared food. If you reported an entry in the food list, the report — the entry it was about, the reason you picked, any note you typed, the email address you typed for a reply, the app version and your phone's diagnostic id — stays after your account is deleted. Any private link from it to your account is cut, and every report is deleted 180 days after it was made. Email us if you want one removed sooner.
• A block, if one was ever placed. If an account, a device or a network was blocked for attacking or abusing the service, the blocked identifier and a short note about why are kept after the account is deleted, so that deleting it cannot lift the block. It holds no name, no email and nothing you recorded; if you were never blocked there is nothing of yours in it.
• A date of birth under 18, if one was confirmed on this phone. The app keeps it on the phone, never on our servers, so the age question cannot simply be answered again there. Deleting an account does not remove it, because it belongs to the phone rather than to an account; the app deletes it once that date is 18 years ago, and uninstalling the app removes it.
• Your address on our website's waiting list, if you joined it. The list on jstfitness.com is separate from the app and is not linked to your account, so deleting your account does not remove it. It is deleted within 30 days after the one launch email, 12 months after you joined in any case, or at once if you email privacy@jstfitness.com.
• Email you sent us, an email asking us to delete your account included. It is kept in our support inbox while we need it to answer you; a rights request and our answer are kept for 24 months as the record that we answered.

The full picture of what the app collects and why is in the Privacy Policy. Questions: privacy@jstfitness.com.