NightWell:Smart Sleep Tracker Android
NightWell:Smart Sleep Tracker gets 100+ downloads a day worldwide (AppInsider estimate, September 2026, rounded down to a band).
NightWell:Smart Sleep Tracker is #9 in Health & Fitness Grossing on Google Play in Japan and charting in 1 of 15 countries we track.
Updated 27 Sep 2026 · rankings refresh through the day
DeveloperC2 INC
CategoryHealth & Fitness
PriceFree
Released
Installs1M+
Rating★ 4.2 (28k)
Updated
Content ratingEveryone
Rating
4.2 ★
28k ratings
Measured
Best rank now
#9
Health & Fitness GrossingMeasured
NightWell:Smart Sleep Tracker on Google Play
App details
App ID
jp.co.c2inc.deepsleep.pokemedi
Publisher
C2 INC
Content rating
Everyone
Tech stack
Trackers and permissions of build v3.1.25, from the εxodus privacy report (CC BY-SA).
Trackers
16
Permissions
17
Trackers
Full permission listProSee plans
NightWell:Smart Sleep Tracker downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Where NightWell:Smart Sleep Tracker's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in NightWell:Smart Sleep Tracker before Apple and Google take their fee.
How this is calculated
Not in an overall Top Grossing chart, only in category charts: each category position is converted to the overall position it corresponds to, then priced on the same rank-to-revenue curve, inside the part of each market the charted apps leave over.
Business model: In-app purchase-led
How NightWell:Smart Sleep Tracker makes money: subscriptions, one-off purchases and ads.
In-app purchasesAds · 51 ad networks
One-off purchases
/mo
of revenue
Ads
/mo
of revenue
Top in-app purchases · App Store US, most popular first
| 1 | Monthly subscription | |
| 2 | Yearly subscription | |
| 3 | Alarm sound "Time for relax" | |
| 4 | Alarm sound "Nocturne No.2" | |
| 5 | Alarm sound "Slumber" | |
| 6 | Lull Sound "Berceuse Op. 57" | |
| 7 | Alarm sound "Minute Waltz" | |
| 8 | Alarm sound "Peer Gynt Morgenstemning Op.46 [w/ES]" | |
| 9 | Lull Sound "Kagura" | |
| 10 | Alarm sound "Piscatio" |
Where it ranks on Google Play
Every top 200 chart it appears in across 15 countries.
| Country | Charts | Rank |
|---|---|---|
| Japan | Health & FitnessGrossing | #9 |
| Japan | Health & FitnessFree | #67 |
Apps near NightWell:Smart Sleep Tracker on the chart
Health & Fitness Grossing, around #9.
Ratings
Google Play, worldwide.
Rating
4.2 ★
28k ratings
Measured
Ratings
28k
Measured
Written reviews
103
Measured
About NightWell:Smart Sleep Tracker
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]
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]
What's new in 5.3.44
Minor fix.