Comparison

Heart Rate Variability Logger vs AI Endurance

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

Head to head
About

Heart Rate Variability Logger

This app records, plots, and exports heart rate variability data, including time, frequency, and non-linear features. It supports experience sampling, RR-interval correction, and activity/location tracking. Requires a compatible Bluetooth heart rate sensor.

Highlights
  • Record and plot HRV data
  • Extract time and frequency domain features
  • Experience sampling for event annotation
  • Compare multiple recordings
  • Activity and location tracking
  • RR-interval correction
  • Export data for Kubios
Features
Read full description

Heart Rate Variability Logger lets you record, plot and export time, frequency and non-linear HRV Features (includes experience sampling, RR-interval correction, DFA alpha 1 for aerobic threshold estimation in real-time, comparison between recordings, activity monitoring & step counting, location tracking). Heart Rate Variability Logger requires a Bluetooth Low Energy (also called Bluetooth Smart or BLE or 4.0) heart rate sensor (we recommend Polar H7 or H10) Main features: - Extracts, plots, stores and exports heart rate, rr-intervals, time and frequency domain heart rate variability features (AVNN, SDNN, rMSSD, pNN50, LF, HF, LF/HF, alpha 1 from DFA) - Configurable experience sampling for events annotation - Comparison between up to 3 recordings lets you get a better understanding of differences in HRV under different contexts in a glance. The comparison modality includes also Outlier removal - Activity tracking: step counter or accelerometer derived motion intensity for user context (step counter only for iPhones 5S) - Location tracking, either using GSM/WiFi networks (low battery consumption) or GPS (high accuracy) - Configurable time window for features computation (choose between 30 seconds, 1, 2 or 5 minutes) - RR-intervals correction can be enabled to prevent ectopic beats or artifacts from affecting HRV features - export for Kubios - Filters data based on the selected threshold - Shows HR in the app icon - Data export using iTunes or Dropbox - Tested for recordings longer than 24 hours Please note that continued use of GPS running in the background can dramatically decrease battery life.

About

AI Endurance

This AI-powered fitness coach analyzes your personal data to create a customized training plan. It's designed for athletes looking to optimize their performance and achieve superior results by training smarter.

Highlights
  • AI-powered performance analysis
  • Personalized training plans
  • Optimized for unique physiology
  • Trusted by cyclists, runners, triathletes
  • Train smarter, not harder
Features
Read full description

AI Endurance is the data-driven AI coach for running, cycling, and triathlon. It learns from your own training to build a model of you (your fitness, your recovery, your race goal), then shapes your plan around that model and adapts it every day, so you always know what to do next. WHY ATHLETES CHOOSE AI ENDURANCE • Adaptive AI training plans: Set a race goal and get a full plan that reshapes itself as your fitness and recovery change. No more rigid plans that fall apart after one bad week. • Recovery you can trust: We read your HRV, resting heart rate, and DFA a1 to tell you when to push and when to back off, so you train hard without digging a hole. • Talk to your AI coach: Ask questions in plain language. Change a workout, understand your data, or plan your week just by chatting. • See inside every workout: Power and pace curves, durability, decoupling, and drift analysis that show exactly how your fitness is changing. • Built to peak, not just predict: Most apps stop at predicting a race time. AI Endurance builds your entire plan to optimize your race-day performance, and refines it as your data changes. • Two-way sync, not just a connection: AI Endurance imports your workouts from Garmin, Strava, Coros, Polar, Wahoo, Suunto and more, and reads your recovery data from Oura, Whoop, and your watch. Then it pushes your planned workouts straight to Garmin, Coros, Wahoo, Zwift, TrainingPeaks and more, ready to train with no manual entry. FOR EVERY ENDURANCE ATHLETE Whether you're chasing a first 5K, a Boston qualifier, a century ride, or an Ironman, AI Endurance meets you where you are and grows with you. Runners, cyclists, and triathletes all train from one adaptive plan. Train smarter. Recover better. Race faster. Download AI Endurance and get a coach that actually adapts to you. By using AI Endurance, you agree to our Privacy Policy and the Apple Standard End User License Agreement (EULA). - Privacy Policy: https://aiendurance.com/privacypolicy - Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Heart Rate Variability Logger4 screens
AI Endurance4 screens

Verdict

The call

The clearest difference is price: AI Endurance at Free against Heart Rate Variability Logger's $9.99. AI Endurance also leads on rating (4.2 vs 3.5) and review sentiment (67% vs 43%). Heart Rate Variability Logger's advantage is in-app purchases (none vs 2) and update cadence (fortnightly vs every 5 months). On ratings volume, 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

AI Endurance is free to download; Heart Rate Variability Logger costs $9.99 up front. AI Endurance sells 2 in-app purchases, starting at $20.00 per month. Heart Rate Variability Logger asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

AI Endurance holds the better App Store score, 4.2 against 3.5. Both are backed by a comparable volume of ratings — 19 and 25 respectively. Written reviews point the same way: 43% of Heart Rate Variability Logger's written reviews are positive against 67% of AI Endurance's.

UpkeepUpdate frequency

Heart Rate Variability Logger ships an update fortnightly, AI Endurance every 5 months. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
Heart Rate Variability Logger versus AI Endurance: the parameters behind the verdict, then further details
ParameterHeart Rate Variability LoggerAI Endurance
Price$9.99Free — better
Rating3.5 (19 ratings)4.2 (25 ratings) — better
Positive reviews43.1% of reviews66.7% of reviews — better
Number of ratings1925 — better
Update frequencyFortnightly — betterEvery 5 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size10 MB3 MB
Age rating4+4+
DeveloperA.S.M.A. B.V.AI Endurance

Customer experience

Heart Rate Variability Logger

All ratings19 ratings
Positive63.2%
Neutral0.0%
Negative36.8%
Written reviews58 reviews
Positive43.1%
Neutral6.9%
Negative50.0%

AI Endurance

All ratings25 ratings
Positive76.0%
Neutral8.0%
Negative16.0%
Written reviews9 reviews
Positive66.7%
Neutral11.1%
Negative22.2%

In-app purchases

None

Heart Rate Variability Logger

No in-app purchases

2 purchases

AI Endurance

Subscriptions2
  • Monthly Subscription$20.001 Month
  • Yearly Subscription$200.001 Year

Questions

Is Heart Rate Variability Logger free?
Heart Rate Variability Logger costs $9.99, with no in-app purchases.
Is AI Endurance free?
AI Endurance is free to download, with in-app purchases available.
Which has better reviews, Heart Rate Variability Logger or AI Endurance?
AI Endurance is rated higher. Heart Rate Variability Logger averages 3.5 out of 5 from 19 ratings, while AI Endurance averages 4.2 from 25 ratings.
Do Heart Rate Variability Logger or AI Endurance have ads?
Neither Heart Rate Variability Logger nor AI Endurance shows ads.
Which is updated more often, Heart Rate Variability Logger or AI Endurance?
Heart Rate Variability Logger ships an update fortnightly, and AI Endurance every 5 months. Most recently, Heart Rate Variability Logger was updated on November 6, 2026 and AI Endurance on October 30, 2026.

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