Comparison

REM Sleep Tracker vs eMoodie Labs

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

Head to head
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

About

eMoodie Labs

Features
Read full description

eMoodie Labs is a scientifically validated platform for experience sampling (ESM) and ecological momentary assessment (EMA), designed to support academic research and remote clinical monitoring. The app enables the study of mental and physical health, social and emotional processes, and the dynamic interplay between interpersonal and contextual factors. It’s fully configurable for projects requiring repeated surveys or standardised questionnaires, with scheduled notifications to encourage timely responses. Designed with an intuitive, professional interface and light gamification features, eMoodie Labs helps improve participant engagement and data quality. It’s suitable for use with children (8+), adolescents, and adults. This version builds on an earlier platform and now offers greater flexibility for tailoring study protocols, streamlined data collection, and an improved participant experience, which makes it even easier to run complex, real-time research in diverse settings.

Screenshots

REM Sleep Tracker4 screens
eMoodie Labs4 screens

Verdict

The call

The clearest difference is in-app purchases: eMoodie Labs at none against REM Sleep Tracker's 2. REM Sleep Tracker's advantage is update cadence (every 2 weeks vs every 5 months). On price, ads, device support and iOS requirement 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. REM Sleep Tracker sells 2 in-app purchases, starting at $9.99 per year. eMoodie Labs asks for nothing beyond the download.

UpkeepUpdate frequency

REM Sleep Tracker ships an update every 2 weeks, eMoodie Labs every 5 months. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

Scorecard2 real differences · 8 level
REM Sleep Tracker versus eMoodie Labs: the parameters behind the verdict, then further details
ParameterREM Sleep TrackereMoodie Labs
PriceFreeFree
Rating4.2 (49 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings49 — better—
Update frequencyEvery 2 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhoneiPhone, iPod — better
Requires iOS16.015.6 — better
Further details — not scored
Size25 MB34 MB
Age rating4+4+
DeveloperNicola EusebiEMOODIE LIMITED

In-app purchases

2 purchases

REM Sleep Tracker

Subscriptions2
  • Sleep Score Premium Yearly$9.991 Year
  • Sleep Score Premium Yearly7 Days trial$29.991 Year
None

eMoodie Labs

No in-app purchases

Questions

Is REM Sleep Tracker free?
REM Sleep Tracker is free to download, with in-app purchases available.
Is eMoodie Labs free?
eMoodie Labs is free to download, with no in-app purchases.
Do REM Sleep Tracker or eMoodie Labs have ads?
Neither REM Sleep Tracker nor eMoodie Labs shows ads.
Which is updated more often, REM Sleep Tracker or eMoodie Labs?
REM Sleep Tracker ships an update every 2 weeks, and eMoodie Labs every 5 months. Most recently, REM Sleep Tracker was updated on November 3, 2026 and eMoodie Labs on November 8, 2026.

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