Comparison

iCardio Workout Tracker vs Zone 2

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

Head to head
About

iCardio Workout Tracker

This app helps you train smarter by using your heart rate data. It tracks workouts, provides real-time feedback, and integrates with wearables and Apple Health to offer insights into your performance and progress.

Highlights
  • Heart rate zone tracking
  • GPS route mapping
  • Voice coaching
  • Apple Watch & Health integration
  • Real-time workout sharing
  • Custom fitness assessments
Features
Read full description

iCardio – Smarter Heart Rate Training (Supports Bluetooth sensors, Apple Watch & Apple Health, and now AirPods Pro G3!) Track, train, and transform your fitness with iCardio, your all-in-one heart rate training companion. Whether you’re walking, running, cycling, or doing your favorite studio workout, iCardio helps you understand your heart, improve performance, and stay motivated. Train with Precision iCardio turns your heart rate into a powerful training tool. See your heart rate zones live as you work out, get instant feedback, and optimize every session to reach your goals faster — whether you’re training for endurance, weight loss, or general fitness. Connected Fitness, Simplified iCardio integrates seamlessly with Apple Watch and Apple Health, automatically syncing your workouts, calories, and key metrics like: * Heart Rate & Zones * Heart Rate Variability (HRV) * Resting Heart Rate Use iCardio as your fitness hub to bring together data from all your favorite Health-connected apps and devices — making it easier to track your overall wellness in one place. Comprehensive Tracking * GPS route mapping for outdoor workouts * Steps, calories, cadence, and power tracking * Custom Fitness Assessments to personalize zones * Routes & Routines to measure progress over time Key Features * Voice Coaching: Real-time cues to keep you on target * LiveTracking: Share your workout progress in real time * Goal Setting: Define and track personal fitness goals * Advanced Graphs & Analytics: Visualize heart rate, pace, and more * Web Sync: Review your data anytime, anywhere* Sleep, Weight, and Blood Pressure Device Compatibility Works with Apple Watch, Apple Health, and most Bluetooth fitness sensors — including Polar, Wahoo, Scosche, Viiiiva, POWR LABS, CooSpo, OrangeTheory, Garmin, and Moofit. Also supports power meters, cadence sensors, and Peloton® bikes. Free Features * Basic heart rate tracking * GPS & route tracking * Customizable voice coaching * Health metrics (weight, sleep, blood pressure) * Sync with Apple Health STAR Membership Unlock deeper insights with STAR Membership ($4.99/month or $29.99/year): * Advanced heart rate zone analysis * Speed and cadence sensor support * Personalized Fitness Assessments * Routes & Routines tracking * LiveTracking for real-time sharing * Group and community data sharing Subscription Details Payment is charged to your iTunes Account at purchase confirmation. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the current period ends. Renewal is billed within 24 hours before renewal at $29.99/year or $4.99/month. Any unused trial period is forfeited upon subscription purchase. Manage or cancel your subscription in your Account Settings at any time. Privacy Policy: fitdigits.com/privacy-policy.html Terms of Use: fitdigits.com/terms-and-conditions.html* Ad-free experience and more Train smarter. Recover better. Live stronger. Download iCardio today and make every heartbeat count.

About

Zone 2

This app helps you track your weekly workout time spent in the Zone 2 heart rate range. It provides detailed tracking, connectivity with various heart rate monitors and Strava, and real-time feedback on your progress towards your fitness goals.

Highlights
  • Weekly, monthly, and daily zone tracking
  • Strava connectivity
  • Home and Lock Screen widgets
  • Bluetooth heart rate monitor compatibility
  • Apple Watch app with live feedback
  • Heart rate zone calculator
Features
Read full description

Zone 2 app tracks how much of your weekly workout time is performed in the zone 2 heart rate range, typically between 60-70% of your maximum heart rate.  Aiming for 150 minutes or more of weekly exercise in zone 2 is recommended, as it optimizes endurance, enhances fat-burning efficiency, and fosters sustainable fitness gains by maintaining a balance between intensity and recovery. The optimal number of minutes to spend in zone 2 per week can vary based on individual fitness levels. _____________________ If you do not have an Apple Watch, you can connect common Bluetooth heart rate monitors, such as the Polar H10, Garmin chest strap, and new Garmin watches, to view your heart rate zone progress live during a workout. If you have an Apple Watch, use the Apple Watch app to see zones live on your wrist with haptic feedback, Siri announcements, and health metrics. If you already have a different app you like for tracking workouts, no worries; Zone 2 uses all workouts saved to your device with heart rate data to calculate your weekly zone minutes. *** Features Include *** • Weekly, monthly, & daily zone tracking based on your weekly goal with multiple chart viewing options • Strava connectivity to upload Zone 2 created distance workouts to your Strava profile • Home Screen and Lock Screen widgets for weekly Zone 2 goal progress • Compatibility with common Bluetooth heart rate monitors for live zone reporting during workouts with optional audio feedback • Apple Watch app with live zone total calculations, multiple workout screens, and optional haptic feedback and alerts • Apple Watch to iPhone mirroring during live workouts to see heart rate on the larger iPhone screen • Zone goal or open goal modes for tracking workouts • Heart rate zone calculator • Live activities on the Dynamic Island or Lock Screen _____________________ What is zone 2 heart rate training? Zone 2 training refers to exercise performed at a moderate intensity that keeps your heart rate in a specific heart rate zone, typically between 60-70% of your maximum heart rate. This is the heart rate zone where your body is able to utilize oxygen most efficiently, which can lead to a range of benefits for your fitness and health. Zone 2 training is important for a number of reasons, including: • Improved aerobic capacity: By training in the zone 2 heart rate range, your body becomes more efficient at using oxygen to produce energy, which can improve your overall aerobic capacity. • Increased fat burning: During moderate-intensity exercise, your body relies more on fat as a source of fuel, which can help to improve your body composition and reduce body fat. • Improved cardiovascular health: Regular exercise in the zone 2 heart rate range can help to strengthen your heart and improve blood flow, which can reduce the risk of heart disease. • Increased endurance: Training at a moderate intensity can help to improve your endurance and stamina, which can be particularly helpful for endurance athletes such as long-distance runners or cyclists. _______________ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

iCardio Workout Tracker4 screens
Zone 24 screens

Verdict

The call

The clearest difference is ratings volume: iCardio Workout Tracker at 3.4K against Zone 2's 241. iCardio Workout Tracker also leads on rating (4.8 vs 4.6). Zone 2's advantage is review sentiment (74% vs 63%). 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. iCardio Workout Tracker sells 4 in-app purchases, starting at $4.99 per month and Zone 2 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

iCardio Workout Tracker holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: iCardio Workout Tracker has 3.4K ratings behind it against 241, so its average is the more settled of the two. Written reviews complicate that: 63% of iCardio Workout Tracker's written reviews are positive against 74% of Zone 2's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

iCardio Workout Tracker ships an update every 11 days, Zone 2 weekly. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

Scorecard3 real differences · 7 level
iCardio Workout Tracker versus Zone 2: the parameters behind the verdict, then further details
ParameteriCardio Workout TrackerZone 2
PriceFreeFree
Rating4.8 (3.4K ratings) — better4.6 (241 ratings)
Positive reviews63.4% of reviews74.1% of reviews — better
Number of ratings3.4K — better241
Update frequencyEvery 11 daysWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, Apple Watch — betteriPhone, Apple Watch
Requires iOS17.617.0 — better
Further details — not scored
Size85 MB15 MB
Age rating4+4+
DeveloperFitdigits IncShannon Bolick

Customer experience

iCardio Workout Tracker

All ratings3,366 ratings
Positive96.6%
Neutral1.2%
Negative2.3%
Written reviews290 reviews
Positive63.4%
Neutral6.6%
Negative30.0%

Zone 2

All ratings241 ratings
Positive91.3%
Neutral1.7%
Negative7.1%
Written reviews58 reviews
Positive74.1%
Neutral1.7%
Negative24.1%

User reviews

iCardio Workout Tracker

From 3.4K App Store ratings

What we love

  • 👍 Great app
  • 🚀 Accurate tracking
  • 💡 Customizable screens
  • 🚀 Reliable connection
  • 👍 Motivating

Room to improve

  • 🐛 Crashes and sync issues
  • 🔋 Battery drain
  • 🔒 Subscription model
  • 🐛 Inconsistent performance
  • 🐛 Sensor connection problems

Zone 2

From 241 App Store ratings

What we love

  • 👍 Simple and intuitive user interface
  • ⏱️ Accurate real-time zone tracking during workouts
  • 📊 Comprehensive cumulative time tracking by zone
  • 🎯 Customizable heart rate zones and weekly goals
  • 🔗 Seamless integration with Apple Health and HR monitors

Room to improve

  • 🐛 Frequent Bluetooth disconnections from HR monitors
  • 🐛 App crashes and freezes mid-workout
  • 🐛 Tracking stops randomly during workouts
  • 📵 Portrait-only orientation (doesn't support landscape properly)
  • 💳 Pricing confusion and unexpected charges

Bugs and requests

iCardio Workout Tracker

Reported bugs

3 issues
  • Garmin ANT+ connectivity issues
  • Incorrect calorie/distance tracking
  • Unreliable heart rate monitoring

Requested features

5 requests
  • Lap/split time tracking
  • Multi-user profiles
  • Treadmill/elliptical integration
  • More customization options
  • Improved Apple Watch integration

Zone 2

Reported bugs

9 issues
  • App crashes on iPhone 11 Pro and iPhone 16 with latest iOS
  • Watch disconnects constantly during workouts
  • Tracking stops mid-workout without saving data
  • Bluetooth connectivity issues with Polar and other HR monitors
  • App freezes at various points during exercise
Show 4 more
  • Landscape mode flicks back to portrait automatically
  • App continues running in background after closing
  • Mirroring to iPhone functionality broken in version 2.7
  • Random disconnections from Apple Watch

Requested features

8 requests
  • Calorie burn tracking and display
  • Landscape orientation support for treadmills and rowers
  • More specific workout categories beyond provided options
  • Music control integration (play, pause, skip)
  • Step tracking during workouts
Show 3 more
  • Expanded time period views for zone totals
  • Voice notifications through headphones instead of watch speakers
  • Option to disable Zone 2 goal for live-only tracking

In-app purchases

4 purchases

iCardio Workout Tracker

Subscriptions3
  • Star Monthly$4.991 Month
  • Pro Plus$24.991 Year
  • Star$29.991 Year
One-time1
  • Plus$6.99
2 purchases

Zone 2

Subscriptions2
  • Unlock All - Monthly3 Days trial$4.991 Month
  • Unlock All - Yearly7 Days trial$39.991 Year

Questions

Is iCardio Workout Tracker free?
iCardio Workout Tracker is free to download, with in-app purchases available.
Is Zone 2 free?
Zone 2 is free to download, with in-app purchases available.
Which has better reviews, iCardio Workout Tracker or Zone 2?
iCardio Workout Tracker is rated higher. iCardio Workout Tracker averages 4.8 out of 5 from 3.4K ratings, while Zone 2 averages 4.6 from 241 ratings.
Do iCardio Workout Tracker or Zone 2 have ads?
Neither iCardio Workout Tracker nor Zone 2 shows ads.
Which is updated more often, iCardio Workout Tracker or Zone 2?
iCardio Workout Tracker ships an update every 11 days, and Zone 2 weekly. Most recently, iCardio Workout Tracker was updated on September 23, 2026 and Zone 2 on September 22, 2026.

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