# Shift - Jet Lag Sleep — Land aligned.

> Land aligned. (iPhone/iPad app by Hashing LLC.)

- Source: https://appshunter.io/ios/app/shift-jet-lag-sleep/id6771602766 (this page in markdown: same URL + `.md`)
- Developer: [Hashing LLC](https://appshunter.io/developer/1867362639)
- Category: Health & Fitness, Travel
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-06-22
- Data updated: 2026-07-18
- User reviews in markdown: https://appshunter.io/ios/app/shift-jet-lag-sleep/id6771602766/reviews.md

## What is Shift?

Most jet lag apps prescribe a plan on day zero and then forget about you. Shift is different. It uses your Apple Watch wrist temperature — the data your watch already collects every night — to estimate where your body clock actually is, and adapts the protocol every morning as your body responds.

A sleep copilot for people who fly often
• Plan a trip, get a day-by-day light, sleep, caffeine, and meal protocol before, during, and after the flight.
• Each morning, Shift re-fits its model against last night's wrist temperature, heart rate, HRV, and sleep midpoint, and rewrites the next three days of cues.
• See your current body time alongside local time, with an honest confidence interval — "estimated ± 42 min" beats a fake-precise readout.
• A predicted alignment timeline shows when your body is expected to catch up.
• Between trips, Everyday mode keeps your rhythm steady and shrinks the social jet lag that builds up at home.

The science
• Wrist temperature is a clinically supported proxy for core body temperature minimum (CBTmin) — a gold-standard circadian phase marker.
• Light cues follow the published Phase Response Curve: morning bright light to advance eastward, evening light to delay westward.
• Adaptation rate is learned per user with a Bayesian update after every trip. Eastward and westward speeds are tracked separately — most people adapt 30–50% slower eastward, and the protocol reflects that.

For frequent flyers
• Designed for people crossing 4+ time zones at least 6 times a year — international consultants, investment bankers, salespeople, expat executives, crew, touring musicians.
• Works best with Apple Watch Series 8 or newer (the first model that records wrist temperature). Without one, Shift uses population estimates and wider confidence intervals.
• iPhone 12 or newer for the on-device model.

Privacy
• Everything runs on your phone. No accounts. No servers. No analytics SDKs.
• HealthKit data stays local. Shift only reads — never writes back to Health.
• Trip data is yours to export as PDF for medical records, expense reimbursement, or your own files.

Access
• Starter access includes a single-trip protocol preview.
• Trip Pass unlocks a 14-day full protocol, reminders, and cue logging for a single trip.
• Shift+ adds unlimited trips, real-time phase tracking, Everyday mode between trips, your weekly report and adaptation profile, PDF export, the Watch app, and Family Sharing where available.
• Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
• Privacy Policy: https://w3h9uf.github.io/shift/privacy.html

Wellness, not medical. Shift does not diagnose or treat any condition and is not a substitute for medical advice.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Shift+ Monthly | $4.99 | per month |
| Shift+ Yearly | $39.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Trip Pass | $6.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-06-22

No release notes.

## More apps by Hashing LLC

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- [Diety Dinner Planner](https://appshunter.io/ios/app/diety-dinner-planner/id6762238614)

All apps by Hashing LLC: https://appshunter.io/developer/1867362639

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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 2026-07-18.*