NightWell:Smart Sleep Tracker

Sleep smarter with gentle alarms, sleep & snore tracking, and restful insights.

株式会社C2（C2, Inc.） · jp.co.c2inc.deepsleep.pokemedi

Not rated yet 1M+ downloads v5.3.45 100.9 MB Android 9+ PEGI 3 · Everyone

Download APK 100.9 MB All versions

Signature matches the Google Play version Details

Watch the NightWell:Smart Sleep Tracker trailer on YouTube

NightWell:Smart Sleep Tracker screenshot 1

NightWell:Smart Sleep Tracker screenshot 2

NightWell:Smart Sleep Tracker screenshot 3

NightWell:Smart Sleep Tracker screenshot 4

NightWell:Smart Sleep Tracker screenshot 5

NightWell:Smart Sleep Tracker screenshot 6

At a glance

Latest version: v5.3.45 (394)
Updated: Oct 3, 2026 (6 days ago)
APK size: 100.9 MB
Requires: Android 9+ (API 28)
CPU support: x86 32-bit, x86 64-bit, ARM 32-bit, ARM 64-bit
Graphics: OpenGL ES 2.0+
Category: Health & Fitness (app)
Listed since: Mar 4, 2021 (at least)
Permissions: 38 (9 sensitive)
Website: jukusui.com
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

NightWell:Smart Sleep Tracker is an app by 株式会社C2（C2, Inc.） in the Health & Fitness category, listed since at least March 2021. It includes native code for x86 32-bit, x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

Since version 5.2.2, the minimum Android version rose from 6.0 to 9. It asks for 38 permissions, 9 of them sensitive, including precise location, record audio and approximate location. It asks for the same permissions as version 5.3.44. The app offers in-app purchases through Google Play and can read the advertising ID that ad and analytics services use.

What's new in v5.3.45

Minor fix.

Description

From the listing uploaded by “appupdater”.

Discover deeper, more restful nights with NightWell, your smart sleep companion. Track sleep patterns, monitor snoring, and wake up gently with intelligent alarms designed around your natural rhythm. Gain personalized insights to improve your rest, energy, and focus every day. Calm sounds and mindful tips help you relax before bed and rise refreshed in the morning. ====Features==== NightWell is a multi-functional alarm clock designed to support and improve your sleep. For people who have trouble falling asleep or waking up refreshed, it has a lot of amazing functions to improve their sleep habits. ◆Lull Sounds The healing lull sound will be played to induce peaceful sleep. This is very good for people who suffer from insomnia, who have trouble falling asleep or who need to relax more in sleeping. ◆Smart Alarm This is available for those who always wake up feeling tired, who turn off the alarm only to fall back to sleep or who have trouble waking up in the morning due to hypotension. This monitors body movements using accelerometer in your smartphone and activates the alarm when you're in light sleep. ◆Sleep Report If you use this app every day, you can get your own report analyzing your sleep in various aspects. This report detects your sleep cycle and provide you with the tips to sleep better. ◆Cloud Service This is the service to keep all of your Sleep Log on the dedicated server safely. When you change your device, you can transfer the data from your old device to the new one. This is a free service. ◆Others ・Wake-up task provides strong support for your awakening. ・Fade-In in the alarm sound wakes you up gently. ===="Premium" Subscriptions ==== ●By purchasing the subscription, all Premium features are available for free and all in-app ads are hidden. ●The subscription fee will be charged to your Google ID. ●Offer the free trial per Google ID. ●The subscription fee will be charged within 24 hours before the end of the free trial. To cancel it during the free trial period, please proceed with the procedure more than 24 hours before the trial ends. ●The subscription fee will be charged within 24 hours before the expiration date. You can cancel the updates more than 24 hours before the expiration date. ●The subscription fee is non-refundable even if there is a time period of use when canceling your subscription. ●For cancellation of the updates, you can do it on MENU on Google Play. ====Terms of Service & Privacy Policy==== Terms of Service : https://jukusui.com/en/terms Privacy Policy : https://jukusui.com/en/privacy ====Support==== [email protected]

Version history

5 versions are listed, going back to v5.2.2. New versions arrive here every few months. Since v5.3.42 it requires Android 9+.

v5.3.45 LATEST Oct 3, 2026 100.9 MB TRUSTED v5.3.44 Aug 19, 2026 100.9 MB TRUSTED v5.3.43 Jul 16, 2026 100.9 MB TRUSTED v5.3.42 Jun 18, 2026 100.9 MB TRUSTED v5.2.2 May 6, 2023 41.2 MB TRUSTED

All 5 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Oct 3, 2026.
Certificate issued to “c2inc” This is the certificate of the Google Play version.
Same certificate as the 4 other versions checked

Store checks and file details

Developer signature verified Oct 3, 2026
Validated against Google Play Oct 3, 2026
Signed byCN=c2inc, OU=c2inc, O=c2inc, L=Bunkyoku, ST=Tokyo, C=ja
Signing certificate (SHA-1)4B:D1:78:C5:7C:B3:82:52:07:A6:34:DB:ED:A7:BF:B8:A3:F6:46:37
File MD56177d17ae69ba93719a60d7c2f08589f
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (4 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (38)

NightWell:Smart Sleep Tracker requests 38 permissions, 9 of them sensitive.

Activity recognition Sensitive android.permission.ACTIVITY_RECOGNITION
Approximate location Sensitive android.permission.ACCESS_COARSE_LOCATION
Display over other apps Sensitive android.permission.SYSTEM_ALERT_WINDOW
Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
Precise location Sensitive android.permission.ACCESS_FINE_LOCATION
Read media audio Sensitive android.permission.READ_MEDIA_AUDIO
Read phone status and identity Sensitive android.permission.READ_PHONE_STATE
Record audio (microphone) Sensitive android.permission.RECORD_AUDIO
Write settings Sensitive android.permission.WRITE_SETTINGS
Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
Access adservices topics android.permission.ACCESS_ADSERVICES_TOPICS
Access notification policy android.permission.ACCESS_NOTIFICATION_POLICY
Advertising ID com.google.android.gms.permission.AD_ID
Apphub bind apphub service (custom) com.applovin.array.apphub.permission.BIND_APPHUB_SERVICE
Control vibration android.permission.VIBRATE
Disable keyguard android.permission.DISABLE_KEYGUARD
Foreground service data sync android.permission.FOREGROUND_SERVICE_DATA_SYNC
Foreground service media playback android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK
Foreground service microphone android.permission.FOREGROUND_SERVICE_MICROPHONE
Full network access android.permission.INTERNET
Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
High sampling rate sensors android.permission.HIGH_SAMPLING_RATE_SENSORS
In-app purchases (Google Play Billing) com.android.vending.BILLING
Internal broadcast protection (app-defined) jp.co.c2inc.deepsleep.pokemedi.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Prevent the device from sleeping android.permission.WAKE_LOCK
Read Google service settings com.google.android.providers.gsf.permission.READ_GSERVICES
Read basic phone state android.permission.READ_BASIC_PHONE_STATE
Receive push notifications com.google.android.c2dm.permission.RECEIVE
Reorder tasks android.permission.REORDER_TASKS
Request ignore battery optimizations android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS
Run at startup android.permission.RECEIVE_BOOT_COMPLETED
Run foreground services android.permission.FOREGROUND_SERVICE
Show notifications android.permission.POST_NOTIFICATIONS
Use exact alarm android.permission.USE_EXACT_ALARM
Use full screen intent android.permission.USE_FULL_SCREEN_INTENT
View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch
Location android.hardware.location
Microphone android.hardware.microphone
Portrait screen android.hardware.screen.portrait
Wi-Fi android.hardware.wifi

NightWell:Smart Sleep Tracker APK: questions and answers

Is there a version of NightWell:Smart Sleep Tracker for older Android phones?

The current version needs Android 9 or later. Version 5.2.2 is the newest listed build that installs on Android 6.0 and later. It is an old build: apps that rely on online services may no longer connect when they are this old. Get version 5.2.2 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is NightWell:Smart Sleep Tracker free?

The APK is free to download, but the app offers in-app purchases through Google Play.

Is the NightWell:Smart Sleep Tracker APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 4 other versions checked. After downloading, check that the file's MD5 is 6177d17ae69ba93719a60d7c2f08589f.