# Circadian Sync

> Circadian Sync (iPhone/iPad app by Jeffrey Yambao.)

- Source: https://appshunter.io/ios/app/circadian-sync/id6755707654 (this page in markdown: same URL + `.md`)
- Developer: [Jeffrey Yambao](https://appshunter.io/developer/995147216)
- Category: Health & Fitness, Lifestyle
- Price: $4.99 (on sale, was $9.99)
- Age rating: 4+
- Requires: iOS 18.2 · 11 MB
- Languages: American English
- Released: 2025-11-25
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/circadian-sync/id6755707654/reviews.md

## What is Circadian Sync?

Stop forcing productivity when your body needs rest. Circadian Sync is the intelligent chronobiology optimizer that aligns your daily habits with your internal rhythms. By tracking your Cortisol Awakening Response (CAR), the app identifies your precise biological windows for peak focus, creative recovery, and deep rest.

Traveling across time zones? Activate Jet Lag Mode to receive scientific light-exposure protocols—telling you exactly when to seek bright light or wear sunglasses—to shift your body clock and eliminate jet lag before you even land. Work smarter, sleep better, and live in sync.


## Version history (last 1 release)

### 1.0 — 2025-11-25

No release notes.

## More apps by Jeffrey Yambao

- [WorldLeaders101](https://appshunter.io/ios/app/worldleaders101/id6736560584)
- [Knocked it Off! Bible Edition](https://appshunter.io/ios/app/knocked-it-off-bible-edition/id6736583549)
- [AmeriTest](https://appshunter.io/ios/app/ameritest/id6736819128)
- [Knocked it Off! Song Quiz App](https://appshunter.io/ios/app/knocked-it-off-song-quiz-app/id6736872640)
- [My Third Grade math](https://appshunter.io/ios/app/my-third-grade-math/id6736880097)
- [3rd Grade Math Masters](https://appshunter.io/ios/app/3rd-grade-math-masters/id6736880854)

All apps by Jeffrey Yambao: https://appshunter.io/developer/995147216

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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 2026-05-17.*