# Circadian: Your Natural Rhythm

> Natural cycles, biorhythm & bedtime calculator for better sleep, energy & health

Canonical page: [https://chrome-stats.com/d/com.crestcoder.circadian](https://chrome-stats.com/d/com.crestcoder.circadian)

## Overview

- **ID:** `com.crestcoder.circadian`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Natural Cycles
- **Category:** HEALTH\_AND\_FITNESS
- **Downloads:** 191,412
- **Rating:** 4.12 / 5 (886 ratings)
- **Version:** 7.4.3
- **Last updated:** 2026-08-31
- **First published:** 2020-10-05
- **Publisher country:** NZ
- **Size:** 47 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.crestcoder.circadian)
- **Website:** [https://circadian.life](https://circadian.life/)
- **Privacy policy:** [https://circadian.life/privacypolicy/](https://circadian.life/privacypolicy/)

## Description

Circadian: Your Natural Rhythm is a cutting-edge Chrome extension designed to help you align with your body's natural cycles and biorhythms for improved sleep, balanced energy, and overall wellness. By focusing on natural diurnal patterns—such as dawn, sunrise, solar noon, and sunset—the app provides customized bedtime calculations and reminders that promote consistent sleep and eating schedules. 

This innovative tool also supports intermittent fasting aligned with daylight hours, helping you regulate metabolism and blood sugar. Built on Nobel Prize-winning chronobiology research, Circadian offers deep insights into melatonin, cortisol, and vitamin D production along with practical alerts to optimize medication, exercise, and meal timing. Embrace natural rhythms and experience healthier living with Circadian's intuitive, nature-driven guidance.

## Rankings

- #162,367 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_COARSE_LOCATION`
- `android.permission.ACCESS_FINE_LOCATION`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.ACCESS_NOTIFICATION_POLICY`
- `android.permission.ACCESS_WIFI_STATE`
- `android.permission.DISABLE_KEYGUARD`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.FOREGROUND_SERVICE_DATA_SYNC`
- `android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK`
- `android.permission.INTERNET`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.READ_EXTERNAL_STORAGE`
- `android.permission.RECEIVE_BOOT_COMPLETED`
- `android.permission.REORDER_TASKS`
- `android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS`
- `android.permission.SCHEDULE_EXACT_ALARM`
- `android.permission.SYSTEM_ALERT_WINDOW`
- `android.permission.USE_EXACT_ALARM`
- `android.permission.USE_FULL_SCREEN_INTENT`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `android.permission.WRITE_EXTERNAL_STORAGE`
- `com.android.vending.BILLING`
- `com.crestcoder.circadian.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.google.android.gms.permission.AD_ID`

## Review summary

Users praise Circadian for helping align rhythms, useful alarms/reminders, and free circadian information, with helpful support. However, recurrent reliability problems (bugs, crashes, and resets), timing inaccuracies, notification failures, upgrade flow frustrations, and some UX issues limit the experience. The app shows strong conceptual value but significant stability and usability drawbacks across reviews.

### Pros

- Helps align wake-sleep with circadian rhythm and reduces fatigue.
- Alarm reminders and morning alarms with sunset timers that adapt to changing wake times.
- Provides useful circadian rhythm information and is free to use.
- Allows saving important preferences and personalized reminders.
- Support appears responsive and helpful when contacted.

### Cons

- Frequent bugs, crashes, and alarms/settings resetting unexpectedly.
- Time and sunrise calculations are often inaccurate or not syncing properly with location.
- Notifications stop working or fail to trigger for some users.
- Premium/upgrade flow can be blocked or confusing (issues upgrading to basic or using premium).
- UX/UI issues and confusing navigation (not always user-friendly).

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.crestcoder.circadian)