Comparison

NightWell vs REM Sleep Tracker

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

NightWell

This smart sleep companion helps you track sleep patterns, monitor snoring, and wake up gently with intelligent alarms. Gain personalized insights to improve rest, energy, and focus, with calming sounds and mindful tips for relaxation before bed.

Highlights
  • Sleep pattern tracking
  • Snoring monitoring
  • Intelligent smart alarm
  • Personalized sleep insights
  • Calming lull sounds
  • Sleep reports
  • Cloud backup
Features
Read full description

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. ◆Connect NightWell to Health app You can connect NightWell to iOS Health app. By turning ON the connection and log your sleep by NightWell, your bedtime and wake up time are automatically updated to the Health app. ◆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 Apple ID. ●Use the free trial (one per Apple ID). ●The subscription fee will be charged within 24 hours before the free trial ends. To avoid charges, cancel the subscription at least 24 hours before the free trial ends. ●The monthly/annual subscription fee will be charged within 24 hours before the current subscription expires. You can cancel automatic renewal at least 24 hours before the expiration date. ●The subscription fee is non-refundable even if there is time remaining until the subscription's expiration. ●To cancel automatic renewal, go to Apple ID settings. ====Terms of Service & Privacy Policy==== Terms of Service : https://jukusui.com/en/terms Privacy Policy : https://jukusui.com/en/privacy ====Support==== jukusui@c2inc.co.jp

About

REM Sleep Tracker

This app analyzes Apple Watch sensor data to provide a sleep quality score. It offers detailed insights into sleep stages, heart rate, and weekly trends, helping users understand and improve their rest habits.

Highlights
  • Sleep quality scoring
  • Detailed sleep stage analysis (light, deep, REM)
  • Heart rate monitoring
  • Weekly trend tracking
  • Sleep bank concept for habit analysis
  • Apple Health integration
Features
Read full description

Sleep Monitor is the perfect app for people eager to enhance the quality of their nighttime rest. Thanks to an advanced algorithm, Sleep Monitor processes the data gathered by your Apple Watch sensors to provide you with an overall score representing the quality of your sleep. This innovative app offers a detailed analysis of the different sleep stages, monitoring light, deep, and REM sleep cycles, and providing information about your heart rate throughout the night. Additionally, Sleep Monitor allows you to track your progress with the "sleep bank" concept, a repository of your rest data that helps you better understand your habits and identify any issues. With Sleep Monitor, you can also monitor the weekly trends of various parameters, such as sleep duration, rest quality, and time spent in each sleep stage. This valuable information will enable you to make targeted lifestyle changes to improve your nighttime rest. Don't miss the opportunity to transform your Apple Watch into a powerful tool for better sleep and waking up more rejuvenated each day. Sleep Monitor is the ideal app for those seeking an ally in sleep management, with an intuitive design and a rich array of features. Download Sleep Monitor today and begin your journey towards more restful and regenerative sleep. Maximize the potential of your Apple Watch and discover how quality rest can improve your daily life! HealthKit Integrated with Apple Health for sleep stages, heart rate, respiratory frequency, age and gender data to calculate sleep quality. Sleep Monitor Premium Sleep Monitor offers a Premium version available as an auto-renewable subscription. Payment will be charged to iTunes Account at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current period. Account will be charged for renewal within 24-hours prior to the end of the current period at the rate of your selected plan above. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings on the device. Once purchased, refunds will not be provided for any unused portion of the term. Privacy policy: http://app.sleepscoreapp.com/Home/Privacy Terms of use: http://app.sleepscoreapp.com/Home/Terms

Screenshots

NightWell4 screens
REM Sleep Tracker4 screens

Verdict

The call

The clearest difference is review sentiment: NightWell at 60% against REM Sleep Tracker's 0%. NightWell also leads on rating (4.6 vs 4.2). REM Sleep Tracker's advantage is ads (none vs shown) and ratings volume (49 vs 16). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. NightWell sells 11 in-app purchases, starting at $9.99 per month and REM Sleep Tracker sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

NightWell holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 16 and 49 respectively. Written reviews point the same way: 60% of NightWell's written reviews are positive against 0% of REM Sleep Tracker's.

UpkeepUpdate frequency

NightWell ships an update every 3 weeks, REM Sleep Tracker every 2 weeks. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
NightWell versus REM Sleep Tracker: the parameters behind the verdict, then further details
ParameterNightWellREM Sleep Tracker
PriceFreeFree
Rating4.6 (16 ratings) — better4.2 (49 ratings)
Positive reviews59.7% of reviews — better0.0% of reviews
Number of ratings1649 — better
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhoneiPhone
Requires iOS16.016.0
Further details — not scored
Size121 MB25 MB
Age rating4+4+
Developer株式会社C2Nicola Eusebi

Customer experience

NightWell

All ratings16 ratings
Positive87.5%
Neutral6.3%
Negative6.3%
Written reviews62 reviews
Positive59.7%
Neutral17.7%
Negative22.6%

REM Sleep Tracker

All ratings49 ratings
Positive79.6%
Neutral6.1%
Negative14.3%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

11 purchases

NightWell

Subscriptions2
  • Monthly7 Days trial$9.991 Month
  • Yearly7 Days trial$39.991 Year
One-time9
  • Ad Removal (7 Days)$0.49
  • Alarm sound "Minute Waltz"$0.99
  • Lull Sound "Berceuse Op. 57"$0.99
Show 6 more
  • Alarm sound "Time for relax"$0.99
  • Alarm sound "Slumber"$0.99
  • Alarm sound "Piscatio"$0.99
  • Lull Sound "Kagura"$0.99
  • Alarm sound "Peer Gynt Morgenstemning Op.46 [w/ES]"$0.99
  • Alarm sound "Nocturne No.2"$0.99
2 purchases

REM Sleep Tracker

Subscriptions2
  • Sleep Score Premium Yearly$9.991 Year
  • Sleep Score Premium Yearly7 Days trial$29.991 Year

Questions

Is NightWell free?
NightWell is free to download, with in-app purchases available.
Is REM Sleep Tracker free?
REM Sleep Tracker is free to download, with in-app purchases available.
Which has better reviews, NightWell or REM Sleep Tracker?
NightWell is rated higher. NightWell averages 4.6 out of 5 from 16 ratings, while REM Sleep Tracker averages 4.2 from 49 ratings.
Do NightWell or REM Sleep Tracker have ads?
NightWell shows ads; REM Sleep Tracker does not.
Which is updated more often, NightWell or REM Sleep Tracker?
NightWell ships an update every 3 weeks, and REM Sleep Tracker every 2 weeks. Most recently, NightWell was updated on October 29, 2026 and REM Sleep Tracker on October 24, 2026.

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