Comparison

Cardio Zones. vs VO2 STUDIO

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
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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

VO2 STUDIO

Features
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REMARQUE: Vous avez besoin de VO2 STUDIO compte pour avoir accès à cette app. Si vous nêtes pas un membre obtenez le gratuitement dans votre salle de gym. Commencer vos progrès pour une vie saine avec VO2 STUDIO qui vous guidera tout au long de votre chemin. Présentation de VO2 STUDIO, remise en forme avec: horaires de classe et douvertures Suivez vos exercices quotidiens Suivez vos mesures de corps Plus de 2000 exercices and activités Démonstration en 3D Entraînements prédéfinis et possibilité de créer le votre Plus de 150 badges à gagner Selectionner des séances dentraînement en ligne et synchroniser les avec votre application à la maison ou dans votre club de fitness tout en gardant trace de vos progès. Vous pouvez synchroniser cette appli avec Apple Health App. Si vous activez cette connexion, toute séance d'entraînement avec l'appli Health sera automatiquement ajouté à votre calendrier d'activités.

Screenshots

Cardio Zones.4 screens
VO2 STUDIO4 screens

Verdict

The call

The clearest difference is price: VO2 STUDIO at Free against Cardio Zones.'s $49.99. Cardio Zones.'s advantage is update cadence (every 5 weeks vs every 3 months) and device support (4 vs 2). On ads, in-app purchases 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

VO2 STUDIO 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, VO2 STUDIO every 3 months. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.

Scorecard3 real differences · 7 level
Cardio Zones. versus VO2 STUDIO: the parameters behind the verdict, then further details
ParameterCardio Zones.VO2 STUDIO
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, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size28 MB210 MB
Age rating12+12+
DeveloperTheo ScottVO2 TRAINING SA

In-app purchases

None

Cardio Zones.

No in-app purchases

None

VO2 STUDIO

No in-app purchases

Questions

Is Cardio Zones. free?
Cardio Zones. costs $49.99, with no in-app purchases.
Is VO2 STUDIO free?
VO2 STUDIO is free to download, with no in-app purchases.
Do Cardio Zones. or VO2 STUDIO have ads?
Neither Cardio Zones. nor VO2 STUDIO shows ads.
Which is updated more often, Cardio Zones. or VO2 STUDIO?
Cardio Zones. ships an update every 5 weeks, and VO2 STUDIO every 3 months. Most recently, Cardio Zones. was updated on October 17, 2026 and VO2 STUDIO on October 7, 2026.

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