Privacy Policy

Effective July 26, 2026 · Applies to the 28 Hour Day iOS app and this website.

28 Hour Day is local-first: app blocking happens on your phone, while the account you create keeps a backup of the profile and progress data described below. This policy explains what we handle, why, and what never leaves your device.

What stays on your device

• Your blocked-app choices. App blocking uses Apple's Screen Time (Family Controls) technology. Apple designs it so that which apps you select is represented by opaque tokens that are unreadable outside your device — we cannot see which apps you block, and this information is never transmitted anywhere.
• Your raw Screen Time activity. We do not receive your browsing history, device-wide app-usage history, or the identity of an app you temporarily unlock. The app only records that an unlock occurred so it can calculate your nightly result.

What we collect, and why

• Account information — your email address, Supabase account identifier, and optional first name are used to sign you in and identify your backup. Authentication is provided by Supabase. If you sign in with Apple or Google, we receive the email address (or Apple's private relay address) those services share.
• Profile and progress backup — your bedtime schedule, goals, personal setup statements (including your vision, anti-vision, identity statement, and promises), appearance preference, night history, streaks, aggregate unlock count, and morning check-ins are backed up to your account so they survive a reinstall. This backup is stored with Supabase and protected by row-level security so only your account can access it. Your blocked-app choices are not part of this backup and cannot leave the device.
• Purchase and product-interaction data — subscriptions are processed by Apple. We use RevenueCat to validate purchases; RevenueCat receives purchase receipt information, an anonymous app-user identifier, and the onboarding version shown to the device so we can compare onboarding performance. We never see your payment details.

What we don't do

• No advertising, and no advertising SDKs.
• No tracking across other companies' apps or websites, and no sale of data.
• No reading of your Screen Time activity — the app schedules blocking; it does not receive your browsing or app-usage history.

Subscriptions

28 Hour Day Pro is offered as an auto-renewing subscription ($29.99/year with a 7-day free trial, or $5.99/month; prices may vary by region). Payment is charged to your Apple ID. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period, and can be managed or cancelled in your device's Settings → Apple ID → Subscriptions. Terms of use: Apple's standard EULA.

Deleting your data

• Delete your account from inside the app (Settings → Account → Delete Account). This permanently deletes your sign-in and your cloud backup. Account deletion does not cancel an Apple subscription; manage or cancel it separately through Apple.
• Delete the app to remove all on-device data.

Children

28 Hour Day is designed for adults managing their own sleep and is not directed at children. It is not a parental-control product and provides no monitoring of anyone else's device.

Changes

If this policy changes materially, we'll update this page and its effective date. Significant changes will be noted in the app's release notes.

Contact

Questions about privacy or your data: charles1999.gao@gmail.com