Privacy Policy
One Good Day ยท Last updated July 8, 2026
The short version: your data exists to coach you and for nothing else. We never sell it, never share it for advertising, and you can delete any of it, or all of it, from inside the app at any time.
What we collect
- Account: your email address (or Apple sign-in identifier) and password hash.
- What you log: your goal and its settings, daily check-ins (mood, stress, sleep, energy, daily counts), days you mark as good or mixed, slips you log (time, triggers, intensity, notes), and your conversations with the coach.
- What the coach learns: short summaries the app derives from your logs and conversations to personalize coaching. You can view and delete each one in Settings under Manage my data.
- Usage analytics: which screens and features are used, so we can improve the app. Analytics events describe actions, not the content of your conversations or notes.
- What we deliberately do not collect: if you connect your calendar, Apple Health, or location, those are read on your phone to inform what the app shows you, and never stored by us or sent anywhere. Location in particular stays on your device: places are remembered only in the app's local storage, we never sell location data, and we never use it for anything other than coaching you.
Where it lives and who processes it
Your data is stored in the United States. We use a small number of service providers to run the app, each receiving only what its job requires:
- Supabase hosts the database and handles sign-in.
- OpenAI processes coach conversations and generates coaching text. Per OpenAI's API policy, this data is not used to train their models.
- PostHog receives usage analytics.
- Resend sends account emails, like the address confirmation.
- Apple handles Sign in with Apple and app distribution.
- Google handles Sign in with Google, only if you choose to sign in that way.
- LangSmith receives coach conversation traces during the beta, so we can review and improve the coach's quality. US-hosted. We will revisit this before public release and update this policy either way.
What we never do
- We never sell your data.
- We never share it with advertisers or data brokers.
- We never post anything on your behalf or contact anyone about you.
Your controls
- Export: Settings offers a full export of everything we hold about you, as JSON.
- Partial deletion: individual coach memories, slips, check-ins, and logged days can each be deleted in the app.
- Full deletion: deleting your account in Settings removes your account and all associated data immediately. There is no retention period and no backup we quietly keep.
What this app is not
One Good Day is a self-guided behavior change tool. It is not medical care, therapy, or a substitute for professional treatment, and it does not diagnose or treat any condition. If you are in crisis, call or text 988 (Suicide and Crisis Lifeline) or contact emergency services.
Age
One Good Day is intended for adults 18 and older.
Changes
If this policy changes in a way that matters, we will say so plainly in the app before the change takes effect, not bury it here.
Contact
Questions about your data: hello@onegood.day