Comparison

E vs VO2 Max Tracker

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

Head to head
About

E

Track outdoor exercises with GPS and connect to compatible treadmills via Bluetooth. Record workout history, share fitness data, and enjoy intelligent treadmill features.

Highlights
  • GPS tracking for outdoor exercises
  • Treadmill compatibility via Bluetooth
  • Workout history tracking
  • Fitness data recording
  • Intelligent treadmill features
  • Fitness data sharing
Read full description

E-Running is an integrated fitness APP with a fully featured GPS tracking service for outdoor exercises. Compatible with numerous brands of treadmills, E-Running can help track your workout history and record your statistics. Enjoy the fun of the next level treadmill intelligence! Record and share your fitness data while on the treadmill ! To sync with a treadmill, E-Running must be supported by Bluetooth BLE4.0 on iOS devices. The use of this software requires iPhone4S or better. Note: Continued use of GPS running in the background can dramatically decrease battery life.

About

VO2 Max Tracker

Measure your cardio fitness (VO₂ max) using a treadmill test and track your progress. Create or select from pre-made HIIT workouts, with real-time guidance on target zones. Integrates with Apple Watch and Bluetooth heart rate monitors.

Highlights
  • VO₂ max testing on treadmills
  • HIIT workout creation and selection
  • Real-time target zone guidance
  • Apple Watch and heart rate monitor integration
  • Workout history with heart rate graphs
  • iCloud data synchronization
Features
Read full description

Use Zephyrus to test your cardio fitness (VO₂ max) on a treadmill, and track your improvement. You can also use Zephyrus to do HIIT workouts. The app comes with a selection of workouts, and lets you create your own workouts. Zephyrus tells you when the target zone changes. To get your heart rate in the app, you can use Apple Watch or heart rate monitors with Bluetooth. Garmin watches with Virtual Run are supported. Cardio fitness is measured with a modified Bruce protocol test you can perform on most treadmills. The test consists of stages with increasing intensity and ends when you reach 85% of maximum heart rate. You can do HIIT workouts on Apple Watch, so you don't have to bring your phone. Your past workouts are saved to your workout history, where you can see the heart rate graph and calories burned. Your data is stored in iCloud, which makes it accessible across your Apple devices. Always consult with a healthcare provider before starting any new exercise program. Exercise can carry risks, especially for people who have certain medical conditions or who have not been physically active in a long time. It's important to understand that using this app does not replace a doctor's advice or treatment. If you would like to report an issue or request a feature for the app, feel free to contact the App Support email. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

E4 screens
VO2 Max Tracker4 screens

Verdict

The call

The clearest difference is in-app purchases: E at none against VO2 Max Tracker's 6. E also leads on iOS requirement (7.0 vs 18.6). VO2 Max Tracker's advantage is update cadence (every 2 weeks vs monthly). On price, rating, ratings volume and ads 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. VO2 Max Tracker sells 6 in-app purchases, starting at $4.99 per 7 days. E asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.0 for E against 4.0 for VO2 Max Tracker. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

E ships an update monthly, VO2 Max Tracker every 2 weeks. The most recent releases landed on October 5, 2026 and October 12, 2026 respectively.

Scorecard4 real differences · 6 level
E versus VO2 Max Tracker: the parameters behind the verdict, then further details
ParameterEVO2 Max Tracker
PriceFreeFree
Rating4.0 (2 ratings)4.0 (1 ratings)
Positive reviews0.0% of reviews—
Number of ratings2 — better1
Update frequencyMonthlyEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPodiPhone, iPad, Apple Watch — better
Requires iOS7.0 — better18.6
Further details — not scored
Size12 MB17 MB
Age rating4+4+
DeveloperFitshow (Xiamen) Infomation Technology Co., Ltd.Havard Tryman

Customer experience

E

All ratings2 ratings
Positive50.0%
Neutral50.0%
Negative0.0%
Written reviews5 reviews
Positive0.0%
Neutral20.0%
Negative80.0%

VO2 Max Tracker

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

E

No in-app purchases

6 purchases

VO2 Max Tracker

Subscriptions6
  • Pro (Weekly)7 Days trial$4.997 Days
  • Pro (Monthly)3 Days trial$7.991 Month
  • Pro3 Days trial$8.997 Days
Show 3 more
  • Pro$24.991 Year
  • Pro (Yearly)3 Days trial$24.991 Year
  • Pro (Yearly)$59.991 Year

Questions

Is E free?
E is free to download, with no in-app purchases.
Is VO2 Max Tracker free?
VO2 Max Tracker is free to download, with in-app purchases available.
Which has better reviews, E or VO2 Max Tracker?
E and VO2 Max Tracker are both rated 4.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do E or VO2 Max Tracker have ads?
Neither E nor VO2 Max Tracker shows ads.
Which is updated more often, E or VO2 Max Tracker?
E ships an update monthly, and VO2 Max Tracker every 2 weeks. Most recently, E was updated on October 5, 2026 and VO2 Max Tracker on October 12, 2026.

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