Legal
Privacy policy
Stial is a fitness app from Dialytics LLC, a Minnesota company doing business as Stial ("Stial", "we"). This policy explains what we collect, why, who we share it with, and the choices you have. Questions: support@stialfitness.com.
What we collect
| Data | Examples | Why |
|---|---|---|
| Account | Email address, sign-in method | To sign you in and reach you about your account |
| Profile | First name, age, sex, height, weight, goals, experience, injuries or limits you tell us about, food preferences | To build your plan and targets |
| Logs | Lifts, cardio, meals, weigh-ins, waist, mobility, daily check-ins, races | To adjust your plan and show your progress |
| Food descriptions and photos | Text or a photo of a meal you choose to send for an estimate | To estimate calories and macros (see AI below) |
| Health and device data, only if you connect it | Workouts, heart rate, sleep and weight from Apple Health, Health Connect or Garmin | To log sessions for you and improve recovery guidance |
| Purchases | Subscription status and renewal date | To unlock Pro. We never see your card number. |
| Diagnostics | Crash reports, device type, app version | To fix bugs |
We do not collect your precise location, your contacts, or data from other apps beyond what you connect.
How Stial uses AI
Some features are powered by Claude, an AI model made by Anthropic. This section is our AI transparency statement.
Which features use AI
- Food estimates: the text or photo you submit, with your calorie and protein targets.
- Meal ideas and meal prep: your targets, food preferences and what you have eaten that day.
- Weekly coach review: your profile and about two weeks of your logs, including any connected health or device data that appears in those logs.
What happens to that data
- It is sent from our server to Anthropic to generate the answer, then the answer is returned to you. Your name and email are not included.
- Meal photos are used for the estimate and are not stored by Stial afterwards.
- We do not use your data to train AI models. We use Anthropic's commercial API, and Anthropic's commercial terms state that it does not train its models on data sent through that API.
- AI answers are estimates and can be wrong. You can edit any number before it is saved.
Your choice
AI features are optional. Stial asks for your consent before the first time your data is sent to the AI, and again before any connected health or device data is included. You can withdraw consent at any time in Me › Privacy. Without it, everything else in Stial still works: you can enter food by hand and your plan still adjusts from your logs.
Health and device data
- Connecting Apple Health, Health Connect or Garmin is optional, and you choose which data types to share. You can disconnect at any time in the app or in the source's own settings.
- We use this data only to provide Stial's features to you. We never sell it, never use it for advertising or marketing, and never share it with data brokers.
- Data from Garmin devices is shown with Garmin attribution and handled under the Garmin Connect Developer Program terms.
- Stial is not a medical device and is not covered by HIPAA.
Who we share data with
Only the service providers that run Stial, each under contract and only for the purpose listed:
| Provider | Purpose |
|---|---|
| Supabase | Database, sign-in and server hosting (United States) |
| Anthropic | AI features described above |
| Apple, Google, RevenueCat, Stripe | Subscriptions and payments |
| Garmin | Only if you connect a Garmin account |
We may also disclose data if the law requires it, or as part of a sale or merger of the business, in which case this policy continues to apply to your data.
Keeping and deleting your data
- We keep your data while your account is open.
- Export: Me › Export my data gives you a file with everything you have logged.
- Delete: Me › Delete my account permanently removes your account and all of your data from our database. Backups are overwritten within 30 days.
- You can also email support@stialfitness.com and we will delete your account for you.
Security
Data is encrypted in transit and at rest. Database rules allow each account to read and change only its own rows. No system is perfectly secure, and we will notify you if a breach affects your data.
Your rights
Depending on where you live, you may have the right to access, correct, delete or get a copy of your personal data, and to opt out of certain processing. You can do most of this in the app. For anything else, email us and we will respond within 45 days.
Age
Stial is for adults aged 18 and over. We do not knowingly collect data from anyone under 18. If you believe a minor has created an account, email us and we will delete it.
Changes
If we change this policy in a way that matters, we will tell you in the app before the change takes effect.
Contact
Dialytics LLC (Stial), Minnesota, USA · support@stialfitness.com