Comparison

Sleep Cycle 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

Sleep Cycle

This app uses sound analysis to track sleep patterns and improve rest. It features an AI sleep coach, a smart alarm that wakes you during light sleep, and tools to identify issues like snoring. Gain insights into your sleep and build healthier habits for more energized days.

Highlights
  • AI sleep coach
  • Smart Alarm clock
  • Sound-based sleep tracking
  • Snoring and cough detection
  • Sleep sounds library
  • Long-term sleep pattern analysis
Features
Read full description

Built on science, Sleep Cycle uses sound analysis to track and improve sleep for over 3 million users worldwide. Our AI sleep coach, sleep tracker and Smart Alarm clock app help users to identify potential sleep issues, gain valuable insights into their sleep patterns and build a healthier sleep routine. Sleep Cycle is the world’s no.1 sleep app with more than 40 million downloads. Track your rest, wake refreshed, and build lifelong sleep habits. AWARDS & RECOGNITIONS Sleep Cycle has been awarded Best Sleep App in 2024 by Digital Health Magazine and featured as App of the Month in Wellness Today. In 2024, Sleep Cycle won two Merit Healthcare Awards: Gold for Mobile Digital Health Resources and Silver for Best Use of Artificial Intelligence. WITH SLEEP CYCLE YOU CAN • Get guidance based on your sleep patterns with our AI sleep coach Luma. • Wake up gently during your lightest sleep phase with our Smart Alarm clock. • Track every night using patented sound technology or accelerometer-based sleep detection, no wearables needed. • Detect nighttime noises like snoring, coughing, or sleep talking, for a path to quieter sleep. • Drift off easily using our sleep sounds library of relaxing stories, sleepy soundscapes and guided meditations. • Understand your sleep patterns with long-term trends and compare your sleep to global benchmarks. • Log sleep notes to understand how caffeine, stress, or exercise affect your rest. WHY USE SLEEP CYCLE? • Wake feeling refreshed with no more groggy mornings. • Get daily stats to help you understand your rest. • Sleep guidance based on your tracked nights. • Health insights with snoring and cough tracking for wellness. • No gadgets, just place your phone on the nightstand. • Premium tools like supportive soundscapes, sleep stories, data export, Philips HUE sunrise and Apple Health sync. ABOUT SLEEP CYCLE Sleep Cycle helps you sleep smarter. Track your nights, gain valuable insights into your sleep patterns, and wake at just the right time to start the day energized. Sleep Cycle gives you science-backed tools and an AI sleep coach Luma to help you improve your sleep for brighter days. Our popular features include: • Superior sleep tracker. • AI sleep coach. • Smart Alarm clock. • Sleep talking recorder. • Advanced sleep analysis. • Snore tracker. • Sleep timer. • Cough recorder. • Sleep stages. • Sleep programs. • SleepGPT. • Sleep goal and score. • Relaxing sleep sounds like nature, rain and ocean sounds. • Sleep Aid including calming meditations and breathing exercises. • And more features to help you improve your rest. TALK TO US If you need any help please contact our customer service at support.sleepcycle.com JOIN THE COMMUNITY ▶ Web: https://sleepcycle.com/ ▶ Instagram: https://www.instagram.com/sleepcycleapp/ ▶ TikTok: https://www.tiktok.com/@sleep_cycle ▶ Reddit: https://www.reddit.com/r/sleepcycle/ Terms & Privacy https://www.sleepcycle.com/privacy-policy/ DOWNLOAD NOW – Sleep Better with Sleep Cycle

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

Sleep Cycle4 screens
REM Sleep Tracker4 screens

Verdict

The call

The clearest difference is review sentiment: Sleep Cycle at 40% against REM Sleep Tracker's 0%. Sleep Cycle also leads on rating (4.7 vs 4.2) and ratings volume (32K vs 49). On price, update cadence, ads and in-app purchases 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. Sleep Cycle sells 9 in-app purchases, starting at $2.99 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

Sleep Cycle holds the better App Store score, 4.7 against 4.2. That said, the two scores are not equally well evidenced: Sleep Cycle has 32K ratings behind it against 49, so its average is the more settled of the two. Written reviews point the same way: 40% of Sleep Cycle's written reviews are positive against 0% of REM Sleep Tracker's.

UpkeepUpdate frequency

Sleep Cycle ships an update weekly, REM Sleep Tracker every 2 weeks. The most recent releases landed on November 12, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 6 level
Sleep Cycle versus REM Sleep Tracker: the parameters behind the verdict, then further details
ParameterSleep CycleREM Sleep Tracker
PriceFreeFree
Rating4.7 (32K ratings) — better4.2 (49 ratings)
Positive reviews39.6% of reviews — better0.0% of reviews
Number of ratings32K — better49
Update frequencyWeekly — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
Best chart rank#44 — better—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS16.216.0 — better
Further details — not scored
Size290 MB25 MB
Age rating4+4+
DeveloperSleep Cycle ABNicola Eusebi

Customer experience

Sleep Cycle

All ratings31,507 ratings
Positive93.4%
Neutral3.1%
Negative3.6%
Written reviews2,307 reviews
Positive39.6%
Neutral13.0%
Negative47.4%

REM Sleep Tracker

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

Bugs and requests

Sleep Cycle

Reported bugs

3 issues
  • App crashes or stops recording sleep randomly
  • Inconsistent time zone handling, causing alarm issues
  • Microphone issues, unable to detect certain sounds

Requested features

4 requests
  • Ability to edit sleep data and notes
  • Nap tracking and power nap functionality
  • More customization options for alarms and sleep aid
  • Improved integration with Apple Health and other devices

REM Sleep Tracker

Not enough reviews yet to summarise bugs or requests.

In-app purchases

9 purchases

Sleep Cycle

Subscriptions9
  • Sleep Cycle Premium$2.991 Month
  • Premium1 Month trial$9.991 Year
  • Premium1 Month trial$11.991 Year
Show 6 more
  • Premium1 Month trial$19.991 Year
  • Sleep Cycle Premium$19.991 Year
  • Premium1 Month trial$29.991 Year
  • Premium1 Month trial$34.991 Year
  • Premium: Unlock all features$39.991 Year
  • Sleep Cycle Premium7 Days trial2 variants$57.991 Year
2 purchases

REM Sleep Tracker

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

Questions

Is Sleep Cycle free?
Sleep Cycle 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, Sleep Cycle or REM Sleep Tracker?
Sleep Cycle is rated higher. Sleep Cycle averages 4.7 out of 5 from 32K ratings, while REM Sleep Tracker averages 4.2 from 49 ratings.
Do Sleep Cycle or REM Sleep Tracker have ads?
Neither Sleep Cycle nor REM Sleep Tracker shows ads.
Which is updated more often, Sleep Cycle or REM Sleep Tracker?
Sleep Cycle ships an update weekly, and REM Sleep Tracker every 2 weeks. Most recently, Sleep Cycle was updated on November 12, 2026 and REM Sleep Tracker on November 3, 2026.

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