Inner Day: Circadian Drift Log
Sleep & body clock for Non-24
Only for iPhone
$0.99 · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Inner Day is a rhythm companion for people with Non-24-hour sleep-wake rhythm disorder and other circadian drift. When your body clock drifts later every day and ordinary alarms never line up, Inner Day helps you live by your "body day" instead of the calendar day.
BODY-DAY CLOCKING — Automatically analyze your free-running period from long-term sleep observations (with confidence intervals), or set an 18–36 hour day length and a body-midnight anchor manually.
APPLE HEALTH (READ-ONLY) — Reads sleep (including REM / core / deep stages), daylight time, steps, and active energy. Read-only: your health data is never modified.
SLEEP DETAILS & TRENDS — Browse daily sleep-stage timelines and weekly / monthly / 6-month composition with average total sleep. On nights without a watch, log sleep manually to keep records continuous.
RHYTHM FORECAST — See how your predicted sleep window overlaps typical daytime hours (aligned / partially misaligned / inverted) before planning your day, plus a multi-day drift preview.
GOLDEN AWAKE WINDOW — Dual 24-hour timelines compare predicted sleep with your target awake hours, revealing conflicts at a glance so you can pick the best dates for outings, appointments, or shift changes (3 / 14 / 30 days ahead).
BODY-TIME ALARMS — AlarmKit system alarms ring at your body time, even in silent and focus modes. Quick Presets by Body Phase and Wind-Down / Wake Light phase reminders deliver by local or body time, as a notification or system alarm.
SCHEDULE CONVERSION — Reads calendar events and converts them to body time (read-only; never writes to your calendar). Sleep projections extend 30+ days ahead, with completed and past sleep on the timeline.
WIDGETS — Lock Screen widgets (circular / rectangular / inline) and a large Home Screen widget show body time, phase, and multi-day sleep windows; the Body Time & Schedule widget pairs body time with your day's events. Widgets follow your in-app language.
EVIDENCE-BASED REPORTS — Generate 28 / 60-day and custom (up to 90-day) observation reports with key metrics and data-quality notes. Export as full PDF, chart PDF, or CSV data packages; clinical terms are redacted automatically. Copy a one-page Visit Summary for doctor visits, or share your current rhythm as a Rhythm Status Card image. Evidence pages link to PubMed / PMC.
DATA & BACKUP — Full JSON backup and restore anytime (free). Members can turn on iCloud sync or upload a restore point to iCloud Drive. See last sync time and status, preview local-vs-cloud differences before restoring, and switch accounts safely.
PRIVACY — No account, no ads, no analytics or tracking. Health data stays on your device and in your own iCloud; the developer has no access.
DEMO MODE — Try every feature without any observation data first.
MEMBERSHIP — Recording, observing, and local backup are free forever.
Free: 28-day report viewing and export in every format (PDF with a light footer watermark), 1 body alarm, 3 manual schedule events, 3-day Golden Awake Window search, 2-day drift preview, and notification reminders.
Membership: unlimited alarms and events, 14 / 30-day search, full drift preview, 60 / 90-day and custom watermark-free exports, system-alarm reminders, calendar sync, home card customization, Rhythm Status Card sharing, and iCloud sync / Drive backup. Monthly, yearly, and one-time lifetime options available.
Subscriptions auto-renew within 24 hours before the period ends; cancel anytime in system settings. Prices shown in the app apply.
This app is for personal health observation and recording only. All materials are for observation reference and do not constitute medical advice, diagnosis, or treatment. Please consult a physician for any health concerns.
End-User License Agreement (EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Terms of Service:
https://icancan.cc/apps/inner-day/terms/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Onboarding is now a 4-screen interactive walkthrough; in Step 2 of Body Day Timing, drag the sleep and wake handles on the body clock ring to set your sleep zone and duration
• The home Body Time card gets a refreshed ring dial, optional side-by-side real-time comparison, and customizable content in Settings
• New Golden Awake Window finder and multi-day sleep drift preview: dual 24-hour timelines compare predicted sleep against your target awake hours so you can lock in dates for outings and appointments (Free covers the next 3 days)
• Alarms add Quick Presets by Body Phase, plus Wind-Down and Wake Light phase transition reminders, delivered by local or body time as a notification or system alarm
• Reports add a copyable one-page Visit Summary and a shareable Rhythm Status Card image; PDF layout and charts are fully upgraded; Free now exports 28-day reports in every format
• Widgets expand: new Lock Screen widgets, a large widget showing multi-day sleep windows and dual dials, and a new Body Time & Schedule medium widget; widget language follows your in-app setting
• Log sleep manually on nights without a watch, edit or delete daily check-ins, and plan further ahead with schedule sleep projections now extending 30+ days
• iCloud settings show last sync time and status, restore previews compare local and cloud data, and account changes are handled safely to avoid mixing data
• Completed all five language localizations, unified delete and destructive confirmations, and fixed reminder alarms being cleared in the background
The developer, 灿灿 李, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 灿灿 李
- Size
- 11.2 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 4 more
- English, Japanese, Korean, Simplified Chinese, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro Lifetime $0.00
- Pro Yearly $7.99
- Pro Monthly $0.99
- Copyright
- © Leon Lee
