# Sleep Cycle Calculator

> Find the best bedtime or wake-up time using 90-minute sleep cycles.

Canonical page: [https://chrome-stats.com/d/com.pentarab.sleepdial](https://chrome-stats.com/d/com.pentarab.sleepdial)

## Overview

- **ID:** `com.pentarab.sleepdial`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** pentarab
- **Category:** LIFESTYLE
- **Downloads:** 32
- **Version:** 1.0.0
- **Last updated:** 2026-09-15
- **First published:** 2026-06-17
- **Publisher country:** KR
- **Size:** 23 MB
- **Data as of:** 2026-09-25
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.pentarab.sleepdial)
- **Website:** [https://pentarab.com](https://pentarab.com/)
- **Privacy policy:** [https://pentarab.com/privacy/android](https://pentarab.com/privacy/android)

## Description

Sleep Cycle Calculator helps you wake up refreshed by timing your sleep around 90-minute sleep cycles. Pick a wake-up time to see the best bedtimes, or tap &quot;sleep now&quot; to see the best times to wake up — each suggestion shows the cycle count and hours of sleep.<br><br>FEATURES<br>• Wake-up planner: choose a wake time, get 4 suggested bedtimes (6, 5, 4 and 3 cycles)<br>• Sleep-now planner: get 4 suggested wake-up times if you fall asleep now<br>• Every card shows the number of sleep cycles and total hours of sleep<br>• More cycle options: 8, 7, 2 and 1 cycles (Pro)<br>• Adjustable fall-asleep buffer, default 15 minutes (Pro)<br>• Recent calculations, reopened in one tap (Pro)<br>• Clean, simple card layout with a 12/24-hour time picker<br>• No accounts, no tracking, no permissions<br><br>Works offline — nothing is sent anywhere, and recent calculations stay on your device.<br><br>This is a simple calculator based on the common 90-minute sleep-cycle estimate. It is not medical advice.<br><br>Remove ads anytime with a one-time in-app purchase.<br><br>Pro: no ads, unlimited use, all features unlocked. One-time purchase.

## Rankings

- #2,471,546 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_ADSERVICES_TOPICS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.WAKE_LOCK`
- `com.android.vending.BILLING`
- `com.android.vending.CHECK_LICENSE`
- `com.google.android.gms.permission.AD_ID`
- `com.pentarab.sleepdial.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

## Similar extensions and apps

- [Sleep Cycle](https://chrome-stats.com/d/com.slcyc.sleepcycle) — 199 users
- [Bedtime Alarm Calculator](https://chrome-stats.com/d/net.appcolors.bedtime_alarm_calculator) — 26 users
- [Sleep Calculator](https://chrome-stats.com/d/com.mycalculators.sleepcycle) — 11 users
- [Sleep Calculator](https://chrome-stats.com/d/sleepcycles.bedtimecalculator.sleepcalculator) — 139 users
- [Sleep Rhythm Guide](https://chrome-stats.com/d/com.kev.changishaapp)
- [DreamCycle](https://chrome-stats.com/d/com.lumako.dreamcycle) — 27 users
- [SleepCycleAlarm](https://chrome-stats.com/d/com.sleepcyclealarm.clockmanager) — 1 users
- [SleepCycle – Sleep Calculator](https://chrome-stats.com/d/com.cosmic.sleepcycle) — 31 users
- [SleepSync](https://chrome-stats.com/d/com.app.sleepcyclecalculatorapp351584) — 23 users
- [Calculadora de Ciclo do Sono](https://chrome-stats.com/d/com.fihane.app) — 7 users
- [REMtime - Sleep Cycle Timer](https://chrome-stats.com/d/com.remtime) — 438 users
- [Calculateur de sommeil](https://chrome-stats.com/d/com.broyz.calculateurdesommeil) — 20 users

---

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