Comparison

HRV Tracker for Watch vs NapBot

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

Head to head
About

HRV Tracker for Watch

Monitor your body's stress levels and recovery by tracking heart rate variability (HRV) using your Apple Watch. Analyze trends, compare HRV to other health metrics, and receive personalized notifications to understand how daily activities impact your well-being.

Highlights
  • Track short-term and long-term HRV trends
  • Compare HRV to activity, sleep, and resting heart rate
  • Receive HRV change notifications on Apple Watch
  • View HRV Trend Summary (experimental)
  • Integrates with Apple Health app
  • Capture HRV data via Mindfulness app
Features
Read full description

Heart Rate Variability (HRV) measurements recorded by your Apple Watch can provide insight into the stress your body is experiencing. By using HRV Tracker to track short-term readings and long-term trends, you can see how factors such as daily workload, workouts, and sleep affect your body's readiness, recovery, and stress. Simply put, the higher your HRV, the better. ***Requires Apple Watch with watchOS 10 or later*** HRV Tracker for Watch integrates with the Health app and uses data stored in the Health app. To ensure your Apple Watch can record HRV measurements, open the Health app on your iPhone to check for existing data: Health app > Browse > Heart > Heart Rate Variability. In addition to automatic recordings, you can also use the Mindfulness app on your Apple Watch to capture new HRV data. Start a Breathe session, and once it ends, a new HRV measurement will appear in HRV Tracker. ***Compare HRV to Other Key Metrics*** Identify potential causes for changes in your HRV with Comparison Charts. -Compare your HRV to relevant health metrics such as activity, sleep, and resting heart rate. ***Follow Long-Term HRV Trends*** Track long-term HRV trends on your iPhone and compare short-term readings to your long-term averages. -Experience smarter insights with the new HRV Trend Summary feature (experimental). Available on Apple Intelligence powered devices running iOS 26. ***Get Notified on Your Apple Watch*** HRV Tracker helps you spot changes in your HRV by monitoring your data in the background and notifying you when your HRV falls below or rises above your preferred levels. -Tracks individual readings as well as 24-hour and 7-day averages. -You can customize the default notification thresholds in the Apple Watch app. -For notifications to work properly, add HRV Tracker to your Watch Face. -Note that notifications may be delayed due to factors like low battery. ***And More*** Track your HRV in multiple ways on your Apple Watch and iPhone. -Choose from various Home Screen widgets or Watch Face complications -Customize charts and views in settings -Scroll and tap on charts for additional insights ***Privacy*** Your privacy is really important to us — we do not collect any data from this app. ***How Is It Measured?*** HRV Tracker uses heart rate variability measurements calculated by detecting the variation between individual heartbeats. Your Apple Watch automatically measures HRV in the background and stores it in HealthKit. HealthKit uses SDNN (Standard Deviation of NN intervals), which reflects the standard deviation of time between normal heartbeats (measured in milliseconds). Please note that many of the features mentioned above are available only to subscribers. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula If you have any questions, we’re happy to help: contact@sydvesti.com

About

NapBot

Automatically track and analyze your sleep cycles using on-device machine learning. Gain insights into sleep phases, heart rate, and environmental sound exposure to understand and improve your sleep quality. Access historical data and trends with a PRO subscription.

Highlights
  • Automatic sleep tracking
  • Detailed sleep phase analysis
  • Environmental sound exposure analysis
  • Sleep heart rate summary
  • Sleep history overview
  • Sleep trend tracking
Features
Read full description

NapBot is an automatic sleep tracking and analyzing app for your iOS and watchOS devices. It uses on-device Machine Learning to detect and understand your sleep. * Sleep Tracking NapBot uses machine learning to automatically track your sleep. * Detailed Sleep Analysis NapBot presents detailed sleep phases analysis by calculating deep and light phases. * Environmental Sound Exposure NapBot analyzes your Environmental Sound Exposure to understand how it affects your sleep quality. * Sleep Heart Rate NapBot presents a sleep Heart Rate summary chart based on your HR zones. PRO Features: * Sleep History Gain insight into your full sleep history in beautifully designed overviews. * Sleep Trends Track your sleep trends to understand how new habits influence your sleep. This app requires an iPhone that has the Health App installed and Apple Watch. Heart readings are read from the Health Data Store which is populated by your Apple Watch. Subscription information Your payment will be charged to your iTunes Account as soon as you confirm your purchase. You can manage your subscriptions and turn off auto-renewal from your Account Settings after the purchase. Your subscription will renew automatically unless you turn off auto-renew at least 24 hours before the end of the current period. The cost of renewal will be charged to your account in 24 hours prior to the end of the current period. When canceling a subscription, your subscription will stay active until the end of the period. Auto-renewal will be disabled, but the current subscription will not be refunded. Any unused portion of a free trial period, if offered, will be forfeited when purchasing a subscription. Terms & Privacy Policy: https://napbot.swiftwithmajid.com/privacy

Screenshots

HRV Tracker for Watch4 screens
NapBot4 screens

Verdict

The call

The clearest difference is monetization model: NapBot at free with in-app purchases against HRV Tracker for Watch's subscription. NapBot also leads on update cadence (every 11 days vs monthly) and ratings volume (6.3K vs 949). HRV Tracker for Watch's advantage is rating (4.5 vs 4.2) and review sentiment (41% vs 21%). On price, ads, in-app purchases and device support 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. HRV Tracker for Watch sells 2 in-app purchases, starting at $2.99 per month and NapBot sells 2 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

HRV Tracker for Watch holds the better App Store score, 4.5 against 4.2. That said, the two scores are not equally well evidenced: NapBot has 6.3K ratings behind it against 949, so its average is the more settled of the two. Written reviews point the same way: 41% of HRV Tracker for Watch's written reviews are positive against 21% of NapBot's.

UpkeepUpdate frequency

HRV Tracker for Watch ships an update monthly, NapBot every 11 days. Both last shipped on October 29, 2026.

Scorecard6 real differences · 4 level
HRV Tracker for Watch versus NapBot: the parameters behind the verdict, then further details
ParameterHRV Tracker for WatchNapBot
PriceFreeFree
Rating4.5 (949 ratings) — better4.2 (6.3K ratings)
Positive reviews41.4% of reviews — better20.9% of reviews
Number of ratings9496.3K — better
Update frequencyMonthlyEvery 11 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationSubscriptionFree with in-app purchases — better
DevicesiPhone, Apple WatchiPhone, Apple Watch
Requires iOS1816.0 — better
Further details — not scored
Size25 MB16 MB
Age rating4+4+
DeveloperSydvesti OyMajid Jabrayilov

Customer experience

HRV Tracker for Watch

All ratings948 ratings
Positive86.8%
Neutral5.4%
Negative7.8%
Written reviews87 reviews
Positive41.4%
Neutral6.9%
Negative51.7%

NapBot

All ratings6,334 ratings
Positive77.6%
Neutral7.4%
Negative15.0%
Written reviews382 reviews
Positive20.9%
Neutral16.0%
Negative63.1%

Bugs and requests

HRV Tracker for Watch

Not enough reviews yet to summarise bugs or requests.

NapBot

Reported bugs

4 issues
  • App crashes after purchasing pro version
  • Sleep data not syncing or disappearing
  • Incorrect time zone and sleep duration displayed
  • Fails to track sleep at all on some nights

Requested features

4 requests
  • Add ability to manually edit or delete sleep data
  • Improve accuracy of sleep tracking
  • Provide more detailed sleep analytics and insights
  • Offer a one-time purchase option instead of subscription

In-app purchases

2 purchases

HRV Tracker for Watch

Subscriptions2
  • Monthly Premium$2.991 Month
  • Yearly Premium$19.991 Year
2 purchases

NapBot

Subscriptions2
  • NapBot PRO Monthly$4.991 Month
  • NapBot PRO Annual7 Days trial$29.991 Year

Questions

Is HRV Tracker for Watch free?
HRV Tracker for Watch is free to download, with in-app purchases available.
Is NapBot free?
NapBot is free to download, with in-app purchases available.
Which has better reviews, HRV Tracker for Watch or NapBot?
HRV Tracker for Watch is rated higher. HRV Tracker for Watch averages 4.5 out of 5 from 949 ratings, while NapBot averages 4.2 from 6.3K ratings.
Do HRV Tracker for Watch or NapBot have ads?
Neither HRV Tracker for Watch nor NapBot shows ads.
Which is updated more often, HRV Tracker for Watch or NapBot?
HRV Tracker for Watch ships an update monthly, and NapBot every 11 days. Most recently, HRV Tracker for Watch was updated on October 29, 2026 and NapBot on October 29, 2026.

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