Comparison

Heart Analyzer vs Rem

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

Head to head
About

Heart Analyzer

Gain deep insights into your heart health using data from your Apple Watch. Visualize trends, analyze metrics like Cardio Recovery and Heart Rate Zones, and generate detailed PDF reports. Offers advanced features and privacy-focused data handling.

Highlights
  • Dashboard with daily summaries
  • Visualized heart rate and health data charts
  • Health vital trend assessment
  • Cardio Recovery and Heart Rate Zone analysis
  • Exportable PDF heart reports
  • ECG data comparison
  • HRV rMSSD and heart rate calibration
Features
Read full description

Heart Analyzer helps you track Heart Rate, HRV, Resting Heart Rate, Cardio Recovery, Sleep and ECG trends using Apple Watch. Analyze your Health data with advanced charts, insights, Heart Reports, widgets and detailed heart analytics powered by Apple Health. Set your own high and low heart rate alerts, take control of your HRV data in the new HRV Center, and see your sleep in detail with multiple sessions, naps and time out of bed. ------------------------------------------------ ■ Simple PRIVACY ------------------------------------------------ ◎ No third party analytics ◎ No health data ever leaves your device ◎ No modifications to your health data ------------------------------------------------ ■ FEATURES ------------------------------------------------ ◎ The Dashboard - Where you can swipe between days, scroll through summaries and tap into the details ◎ Charts - Heart Rate and other Health data visualized through metrics and trends of any given day ◎ Insights - Effortlessly assess your Health Vital trends ◎ Heart Rate Alerts - Choose your own high and low heart rate limits, set mute times, and opt to be notified only on sustained changes ◎ HRV Center - Control the quality and context of the Heart Rate Variability data behind your trends ◎ Sleep - Multiple sleep sessions, naps and time out of bed, with your heart rate through the night ◎ Analytics Plus - Gain a unique understanding of important metrics such as Cardio Recovery, Heart Rate Zones and plenty more ◎ Heart Reports - Generate and export tailored PDFs including a large selection of metrics with custom timescales and password protection support ◎ Bookmarks - Highlight specific days of interest, make notes on relevant details ◎ Widgets - Interact with your Home Screen and track your Heart Rate, Resting Heart Rate trends and more at a glance ◎ ECGs - Compare and analyze data recorded by Apple Watch ◎ Advanced features - Including HRV rMSSD, Heart Rate Calibration, Custom Heart Rate Zones, Smart Heart Rate Recovery and more ------------------------------------------------ ■ APPLE WATCH ------------------------------------------------ ◎ A re-designed app showing your Heart Rate over the day ◎ Heart Rate Alerts on your wrist, with no complication needed on your watch face ◎ Charts with you on the go for Move, Exercise, Cardio Points, HRV, Blood Oxygen Saturation and Resting Heart Rate ◎ Workouts right on your wrist, tap into the detail as soon as you finish your exercise ◎ Customizable complications to keep you up to date with your Heart Rate and also support for Blood Oxygen Saturation, Heart Rate Variability and Resting Heart Rate trends HEALTH SUPPORT INCLUDES: - Heart Rate - Resting Heart Rate - Blood Pressure (Systolic & Diastolic) - Electrocardiogram (ECG/EKG) - Blood Oxygen Saturation (SPO2) - Cardio Fitness (VO2Max) - Heart Rate Variability (SDNN & rMSSD) - Respiratory Rate - Breathing Disturbances - Workouts - Sleep Times, Sessions & Naps - Heart Rate Recovery - Apple Fitness & Activity - High & Low Heart Rate Notifications Heart Analyzer Premium is available as an optional monthly or annual subscription. You can also choose a one-time Lifetime Access purchase. Payment will be charged to your Apple ID account. Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current billing period. You can manage or cancel your subscription at any time in your App Store account settings. Additional Terms of Use: https://www.helixapps.co.uk/heart-analyzer-terms-of-use Please Note: - Heart Analyzer integrates with the Apple Health App to read your Heart Rate and other Health data - Heart Analyzer is available on iPad with iCloud sync for Apple Health data enabled. However, you still need an iPhone with a paired Apple Watch to generate Health data to display in Heart Analyzer - To get the most out of Heart Analyzer, an iPhone with a paired Apple Watch is required

About

Rem

This app automatically tracks your sleep cycles using your Apple Watch, providing detailed analysis of your sleep patterns. It offers insights into sleep quality, disruptions, and heart rate, helping you understand and improve your rest.

Highlights
  • Automatic sleep tracking
  • Sleep pattern analysis
  • Snore detection
  • Sleep score and breakdown
  • Heart rate analysis
  • Smart alarm clock
Features
Read full description

Unlock the secrets of a good night's sleep with Rem, the smart autosleep tracker. With its advanced AI-Machine Learning technology, Rem provides an in-depth analysis of your sleep patterns and helps you understand the impact of your habits and routines on your sleep quality. Get ready to say goodbye to restless nights and hello to sweet dreams with Rem. = Key Features = — Completely Automatic and Easy to use — Sleep Pattern Diagram (Rem stage included) — Snore Detection — Sleep Score — Score Breakdown — Heart Rate Analysis (Dip and Detail Diagram) — Sleep Regularity — Time to Sleep — Trends — Nap Detection — Sleep History — Sleep Assessment — Smart Alarm Clock — Low Battery Usage — Compatible with All Available Apple Watch Versions ============= HOW REM WORKS: • All you need to do is wear your Apple Watch to bed. • An iwatch sleep tracker, facilitates the AI-Machine Learning algorithm to analyze sleep cycle. • Moving more or less than others, Rem adjusts automatically to your personal data • We ignore sleep sessions that are less than 1 hour. To enable snore detection: 1. Connect your iPhone to a power source 2. Tap the "Start Tracking" button 3. Optionally, set a gentle alarm to wake you up. — EASY TO USE — Just wear your Apple watch before bedtime and check your sleep log after you wake up. Your shut eye report is displayed in a clear and understandable way. — SLEEP PATTERN DIAGRAM — Understand your sleep cycles with simple graphs. Discover how to get the restful and restorative sleep you deserve! You can find out the exact times you’ve been disrupted, as well as easily learn the total amount of deep, light, and REM phases. — SNORE Detection — You can identify if snoring is affecting your sleep quality and take necessary actions to improve it. Rem is also equipped with environment sound detection, so you can monitor the ambient noise levels and make adjustments for a more comfortable sleeping environment. — SLEEP SCORE — Your Sleep Score is displayed clearly with a number 0-100 which is an accurate interpretation of your rest quality. — SCORE BREAKDOWN — REM App highlights the most relevant data of your sleep: • Time Asleep • Sleep Details » The total minutes of your deep and REM phases, the most restorative phase of your sleep • Heart Rate » Your heart rate analysis is key for measuring your shut eye quality. You can view your sleeping heart rate graph, your average sleeping heart rate, and the dip percentage of your heart rate during sleep • Disruption • Regularity » REM app records your sleep rhythm automatically and will demonstrate your sleep consistency in a user-friendly diagram. • Time To Sleep • Respiratory Rate » The number of times you breathe in a minute during sleep • Blood Oxygen » The level of blood oxygen during sleep — TRENDS — Follow the impact of your routines on your sleep quality with help of trend diagrams. — SLEEP HISTORY — Monitor your previous sleep diagrams and compare them to your latest data. — NAP DETECTION — REM is an auto nap tracker and will show the nap sessions in a separate field. — SLEEP ASSESSMENT — Learn more about healthy sleep practices by taking the assessment and set yourself up for better sleep. — SMART ALARM — Wake up refreshed and ready for the day. Our smart alarm clock gently eases you out of deep sleep. To use this feature, watchOS 6 or higher is required. — LOW BATTERY USAGE — Don’t worry about draining your battery because it’s low battery usage, even less than your usual usage of Watch. Charge your watch during the day or before sleep. Make sure it has at least a %30 charge. Rem is for anybody who struggles with insomnia or sleep apnea. With the power of its sleep tracking algorithm, you can find accurate and valuable insight about your sleep. Set the smart alarm before bed time and rise refreshed and on-time. It’s a simple-to-use sleep recorder, no need to put it under your pillow. Terms and Privacy Policy: https://bettersleeapapp.com/rem/terms.html

Screenshots

Heart Analyzer4 screens
Rem4 screens

Verdict

The call

The clearest difference is review sentiment: Heart Analyzer at 84% against Rem's 38%. Heart Analyzer also leads on rating (4.7 vs 4.2) and update cadence (weekly vs every 6 weeks). On price, ads, 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. Heart Analyzer sells 7 in-app purchases, starting at $3.99 per month and Rem sells 8 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Heart Analyzer holds the better App Store score, 4.7 against 4.2. That said, the two scores are not equally well evidenced: Heart Analyzer has 22K ratings behind it against 2.7K, so its average is the more settled of the two. Written reviews point the same way: 84% of Heart Analyzer's written reviews are positive against 38% of Rem's.

UpkeepUpdate frequency

Heart Analyzer ships an update weekly, Rem every 6 weeks. Both last shipped on October 25, 2026.

Scorecard4 real differences · 6 level
Heart Analyzer versus Rem: the parameters behind the verdict, then further details
ParameterHeart AnalyzerRem
PriceFreeFree
Rating4.7 (22K ratings) — better4.2 (2.7K ratings)
Positive reviews84.2% of reviews — better37.7% of reviews
Number of ratings22K — better2.7K
Update frequencyWeekly — betterEvery 6 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Apple Watch — betteriPhone, Apple Watch
Requires iOS17.516.0 — better
Further details — not scored
Size54 MB102 MB
Age rating4+12+
DeveloperHelix Apps LTDWELLBEINE TECHNOLOGIES INC

Customer experience

Heart Analyzer

All ratings22,303 ratings
Positive92.6%
Neutral3.6%
Negative3.7%
Written reviews1,853 reviews
Positive84.2%
Neutral6.3%
Negative9.5%

Rem

All ratings2,725 ratings
Positive78.2%
Neutral6.2%
Negative15.6%
Written reviews334 reviews
Positive37.7%
Neutral12.3%
Negative50.0%

User reviews

Heart Analyzer

From 22K App Store ratings

What we love

  • 🚀 Great app for health monitoring
  • 👍 Packed with useful information
  • 🚀 Excellent visualizations and charts
  • 👍 Easy to use and understand
  • 👍 Helpful for monitoring heart conditions

Room to improve

  • 🐛 Occasional crashes or bugs
  • 🔋 Drains Apple Watch battery
  • 🔍 Needs more explanation of metrics
  • 🔍 Visuals could be improved for easier reading
  • 🔍 Automatic updates to complications not reliable

Rem

From 2.7K App Store ratings

What we love

  • 🚀 Accurate sleep tracking
  • 📊 Detailed sleep data
  • 🔍 Helpful for monitoring sleep issues
  • 👍 Simple and intuitive interface
  • 💤 Tracks naps

Room to improve

  • 🐛 Inconsistent data recording
  • ⏰ Inaccurate sleep/wake times
  • 💰 Expensive subscription
  • 🔇 Snoring/noise tracking not working
  • 🔄 Changing/inconsistent sleep results

Bugs and requests

Heart Analyzer

Reported bugs

3 issues
  • Premium features not working as expected
  • Syncing issues between iPhone and Apple Watch
  • Oxygen level tracking not functioning properly

Requested features

4 requests
  • Add blood pressure monitoring
  • Allow generating reports for current month
  • Improve ECG interpretation guidance
  • Add option to customize Apple Watch complications

Rem

Reported bugs

3 issues
  • App crashes or freezes
  • Disconnection issues with Apple Watch
  • Lack of customer support responsiveness

Requested features

5 requests
  • Historical sleep data and trends
  • Ability to edit sleep times
  • Improved smart alarm functionality
  • Better integration with Apple Health
  • More customization options

In-app purchases

7 purchases

Heart Analyzer

Subscriptions2
  • Monthly$3.991 Month
  • Annual$19.991 Year
One-time5
  • Data Plus$9.99
  • Reports Plus$9.99
  • Analytics Plus$9.99
Show 2 more
  • Complete Premium$24.99
  • Lifetime Access$49.99
8 purchases

Rem

Subscriptions7
  • Monthly Subscription7 Days trial$4.991 Month
  • 3 Month Subscription7 Days trial$19.493 Months
  • 6 Month Subscription7 Days trial$25.996 Months
Show 4 more
  • Yearly Subscription7 Days trial$29.991 Year
  • Yearly Subscription$29.991 Year
  • Rem Premium7 Days trial$29.991 Year
  • Yearly Subscription7 Days trial$59.991 Year
One-time1
  • Lifetime Subscription$49.99

Questions

Is Heart Analyzer free?
Heart Analyzer is free to download, with in-app purchases available.
Is Rem free?
Rem is free to download, with in-app purchases available.
Which has better reviews, Heart Analyzer or Rem?
Heart Analyzer is rated higher. Heart Analyzer averages 4.7 out of 5 from 22K ratings, while Rem averages 4.2 from 2.7K ratings.
Do Heart Analyzer or Rem have ads?
Neither Heart Analyzer nor Rem shows ads.
Which is updated more often, Heart Analyzer or Rem?
Heart Analyzer ships an update weekly, and Rem every 6 weeks. Most recently, Heart Analyzer was updated on October 25, 2026 and Rem on October 25, 2026.

Other comparisons