# Inner Day: Circadian Drift Log — Sleep & body clock for Non-24

> Sleep & body clock for Non-24 (iPhone/iPad app by 灿灿 李.)

- Source: https://appshunter.io/ios/app/inner-day-circadian-drift-log/id6816689330 (this page in markdown: same URL + `.md`)
- Developer: [灿灿 李](https://appshunter.io/developer/1868240824)
- Category: Lifestyle
- Price: $0.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 11 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-10-20
- Data updated: 2026-10-31

## What is Inner Day?

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/

## Pricing and in-app purchases

Base price: $0.99.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Yearly | $7.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Lifetime | Free | one-time |


## Is Inner Day safe?

Not enough ratings yet to assess Inner Day.

## Is Inner Day legit?

Inner Day: Circadian Drift Log appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Inner Day is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 26.10.25 — 2026-10-26

• 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

### 26.10.23 — 2026-10-22

• Refreshed UI across the rhythm home, report, schedule and alarm pages
• Schedule page now shows local time and body time side by side, with entry in either
• Simpler body clock setup: confirm your cycle length first, then align the start with dual dials
• Improved sleep analysis: refined timezone handling and validity checks

### 26.10.22 — 2026-10-22

• Fixed a crash when paging through the onboarding guide
• Improved first-run onboarding: continue after granting Apple Health access, and finish body clock setup right in the guide
• Refined membership page content

### 1.0.0 — 2026-10-20

No release notes.

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All apps by 灿灿 李: https://appshunter.io/developer/1868240824

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-31.*