Privacy Policy

Last updated: July 2026

Drift is a private sleep journal. Your sleep data is some of the most personal data you have. This page tells you exactly what Drift does and does not do with it.

What Drift collects

• Account. Sign in with Apple gives us an opaque identifier (Apple's "sub" claim) and, optionally, your email. We never receive your Apple ID password. After sign-in, the app holds a Drift session token — your Apple credential is verified once and not stored on our servers.
• Sleep diary entries. The times, quality scores, and notes you log each morning. Stored against your account so you can see history across devices.
• Sleep metrics from Apple Health. If you grant HealthKit permission, Drift reads sleep stages, heart rate variability, resting heart rate, and respiratory rate to pre-fill your morning diary. Drift is read-only: it never writes anything to Apple Health.
• Sound-event labels. If you use on-device snore/cough detection, only the event labels (kind, time, duration, confidence) sync to your account — never audio.
• Protocol state. Which sleep-window week you're on, your weekly review numbers, and your screening responses (ISI, safety screener).
• Coach conversations. If you use the optional coach, your messages and the diary summary sent with them are stored so you can see your history. Apple Health-derived numbers are included in a coach request only if you switch that on when you first use the coach.
• Subscription state. Apple sends us a transaction identifier so we can confirm Pro status. We never see your card details.

What Drift does not do

• Audio never leaves your device. The snore/cough/sleep-talk classifier runs entirely on your iPhone using Apple's on-device Sound Analysis. We only sync the event labels (e.g. "snore at 02:14, 12 seconds, confidence 0.81"), never the raw audio.
• Nothing is written to Apple Health. Drift cannot alter, overwrite, or corrupt your existing Apple Health data.
• We don't sell your data. Not to advertisers, not to data brokers, not to anyone.
• We don't use your sleep diary to train public models.
• We don't ship third-party tracking SDKs.
• We don't share your data with insurers, employers, or wellness programs.

Service providers

Drift uses Apple (App Store, notifications, Sign in with Apple, HealthKit) and an inference service that runs the optional sleep-coach chat. Coach requests are processed to answer the immediate message and conversations are not used to train models. Avoid putting personal medical details in coach messages — the app reminds you of this before your first message.

Retention and deletion

Your data is kept while your account exists. "Delete account & data" in Settings permanently erases your account, diary, metrics, protocol state, sound-event labels, coach history, and session tokens from our servers, immediately. Email nora@halehearth.com if you'd prefer to make the request by email; we respond within 30 days.

Children

Drift is intended for adults 18 and over. We don't knowingly collect data from minors. If you believe a child has signed up, contact us and we'll remove the account.

Contact

nora@halehearth.com