Comparison

Cardio Zones. vs Workout Data

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

Head to head
About

Cardio Zones.

Train effectively by keeping your heart rate within target zones during various activities. Analyze your performance with cumulative graphs and track your routes. Measure fitness metrics and access preloaded or custom heart rate zones.

Highlights
  • Voice assistant for heart rate zone guidance
  • Cumulative graphs of time in heart rate zones
  • Fitness level and recovery heart rate rating
  • Resting Heart Rate & VO2 Max measurement
  • Preloaded and custom heart rate zones
  • Location tracking of routes with heart rate data
  • Export heart data to CSV for analysis
Features
Read full description

Take your Apple Watch (leave your iPhone at home), bluetooth headphones, go for a run, walk, cycle, spin (Schwinn bikes), gym, swim, row, .... - Use the voice assistant to regulate and keep your heart rate within target zones during workouts - View cumulative graphs for time spent in heart rate zones for workouts, even for any workout recorded by other apps and stored in Apple Health - Rate your fitness level, and recovery heart rate (Superior, Excellent, Good, Fair, Poor) - Measure your Resting Heart Rate & VO2 Max, plus calculate your Max Heart Rate  - Preloaded Heart rate training zones: Karvonen & Zoladz formulas, British Cycling Coaches, Joe Friel Running & Cycle and more. - Create your bespoke heart rate zones. - Find training zones for beginners, intermediates and professionals. - Voice alarm warning guidance helping you stay in your training zones, with Bluetooth headphone support (listen to the funky comments on your progress during your workout) - Real-time heart rate, statistical prediction and training zones are shown in a graph and text format. - Location tracking of your routes with your heart rate data at each point on the map. - Display heart rate data on maps and/or in a graph format. - Export heart data to CSV on iCloud and use Excel and Numbers from your Mac or PC to analyse the raw data and build your own optimised training programme - No login account is required, no external web accounts are needed, and you keep your data (strict privacy). - No subscriptions are required, no extra payments, and full access immediately. - Support portrait and landscape display modes. - Support for Cycling Speed and Cadence Bluetooth service (Apple Watch only) Your heart rate provides insight into how efficiently you’re training and gives you a way to quantify improvements. With zone training, you can yield different benefits and are appropriate at different times during a training plan, whether that is weight loss or improved cardiovascular performance.  Zone training gives you focus. Measuring your heart rate and keeping within your zones can help you from overtraining. Overtraining can lead to exercise addiction which can lead to negative physiological and psychological effects, constant muscle soreness, elevated resting heart rate, burnout, reduced variability, elevated blood pressure, lack of appetite, and even becoming moody. To get the best out of the app you need a heart rate sensor that conforms to the Bluetooth 4 Heart Rate Service (HRS) like the Polar H7 Smart, Wahoo TICKR, Bose Soudsport Pulse, etc. You don’t have a heart sensor: The following functions are available if you don’t have a bluetooth heart sensor or Apple Watch: - Calculate your VO2 Max doing a 1½ mile run. - Calculate your Maximum heart rate. - Get optimal heart zones depending on your fitness goals (fat burn, cardio, et.c). - References and reading material on how heart rate zones are used in fitness & sports sciences. Data Privacy: - Your data remain private in your iOS Device or iCloud Account. You are in control over who views or uses your data. - This app works seamlessly with Apple Health - You do not need any annoying login accounts. - All data is stored on your iPhone/iPad/Apple Watch, and no data is on any external database on the internet or worldwide web. Battery: - Continued use of GPS running in the background can dramatically decrease battery life. - Continued use of the Apple Watch heart rate sensor can dramatically decrease battery life. - Viewing your heart rate in Graph mode will impact your battery life when the App is automatically (the icon with the wheel at the top) adjusting the XY-Axis. Tap on the wheel/settings icon at the top to switch to manual mode to conserve battery life and reduce the graphics power processing requirements. Thank you for your time, and for support or new features request, send me an email from within the App: About | Contact or tweet @ZoneTrainingApp

About

Workout Data

Features
Read full description

Workout Data is an app that allows you to view time in heart rate zones, total distance and total time for your workouts that sync with the Apple Workout and Health Apps. You can select to view this data by month, week or day and filter by specific activity types and date ranges.

Screenshots

Cardio Zones.4 screens
Workout Data4 screens

Verdict

The call

The clearest difference is price: Workout Data at Free against Cardio Zones.'s $49.99. Cardio Zones.'s advantage is update cadence (every 5 weeks vs every 3 months). On ads, in-app purchases, 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

Workout Data is free to download; Cardio Zones. costs $49.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Cardio Zones. ships an update every 5 weeks, Workout Data every 3 months. The most recent releases landed on October 17, 2026 and October 11, 2026 respectively.

Scorecard2 real differences · 8 level
Cardio Zones. versus Workout Data: the parameters behind the verdict, then further details
ParameterCardio Zones.Workout Data
Price$49.99Free — better
Rating4.3 (40 ratings) — better—
Positive reviews47.6% of reviews—
Number of ratings40 — better—
Update frequencyEvery 5 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS15.6 — better16.0
Further details — not scored
Size28 MB8 MB
Age rating12+4+
DeveloperTheo ScottPiryon Enterprises LLC

In-app purchases

None

Cardio Zones.

No in-app purchases

None

Workout Data

No in-app purchases

Questions

Is Cardio Zones. free?
Cardio Zones. costs $49.99, with no in-app purchases.
Is Workout Data free?
Workout Data is free to download, with no in-app purchases.
Do Cardio Zones. or Workout Data have ads?
Neither Cardio Zones. nor Workout Data shows ads.
Which is updated more often, Cardio Zones. or Workout Data?
Cardio Zones. ships an update every 5 weeks, and Workout Data every 3 months. Most recently, Cardio Zones. was updated on October 17, 2026 and Workout Data on October 11, 2026.

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