True VO2 Max — Cardio Fitness

True VO2 Max — Cardio Fitness

VO2 Indoor & Lab-like Tracking

12 ratings
7 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • October 22, 2025
  • August 2, 2026

Features

True VO2 Max — Cardio Fitness screenshot #1 for iPhone
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True VO2 Max — Cardio Fitness screenshot #9 for iPhone
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About

This app provides lab-like cardio fitness insights using your Apple Watch, correcting for real-world factors like weather and altitude. It offers indoor treadmill tracking and helps you trust your fitness trend by removing misleading outdoor conditions.

Indoor treadmill VO2 max estimation
Weather and altitude correction for VO2 max
Raw vs. corrected VO2 max comparison
Automatic workout processing
Apple Watch and Health app sync
No account or ads required
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What's New in True VO2 Max

2.5

August 2, 2026

Completely rebuilt workout syncing for faster, more reliable updates from Apple Health. Workouts now appear sooner while additional details continue syncing automatically. Improved post-workout summaries, including clearer handling of information that is still processing or unavailable. More reliable route, weather, heart-rate, and VO₂ max enrichment. Post-workout notifications are now available to everyone. Improved subscription purchasing and entitlement recognition. Safer workout-history migration, stronger data protection, and numerous performance and stability improvements. Stay tuned & rate us if you enjoy using True VO2 Max!

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Subscription plans

Plus Monthly Subscription

Get access to all features in Plus

$5.991 Month
7 Days trial
How to cancel True VO2 Max subscription ⁉️

User reviews

Apple should buy this

Great app. Very helpful. I was puzzled when Apple’s estimate of my VO₂ Max started going down despite no changes in my training plan. It occurred to me that this coincided with a heat wave but it seemed inconceivable that Apple would not factor that in. Wrong. This app convinced me that I was not doing anything wrong and now that the weather has cleared up, Apple’s estimate is catching up. Thanks to the developer for saving me from changing something that has been working.
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Nice app but needs better sync!

I love the app when it works, but I often have trouble with it not reading recent outdoor runs or walks where there is indeed a VO2Max score. I use the same tracking method, Apple Watch Series 11, iPhone 17 Pro Max, tracked with the Fitness app every single time. Currently it only shows runs through early last week when I have had 3 outdoor runs since then. There is no refresh button, all permissions are granted, no changes made.
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Not great

The app doesn’t see indoor workouts even with a paid membership, it’s simple won’t take into account count your treadmill runs. This app should be free until everything is fixed and works as advertised.

Response from developer

Hi there, thank you for your feedback, and I am very sorry for the frustration. I want to sort this out as soon as possible for you. To track your treadmill runs correctly, please ensure the True VO2 Max app is installed directly on your Apple Watch. You will need to use our watch app to record your treadmill sessions instead of the native Apple Fitness app. If you are already doing this and it still is not working, please email us at truevo2max@gmail.com. To help us troubleshoot, please include your iPhone and Apple Watch models, along with screenshots of the Indoor Settings tab from the True VO2 Max app on your phone. We want to get this fixed for you right away.

Love the app!

It’s amazing that it factors in elevation and temperature during the run. Easy to use and set up!

Wanted to love it, but …

03.27 update: Psst! Fahrenheit vs Celsius option, please //

Original: … too rudimentary.
(1) Out on a run; aborted 5 minutes in. Deleted it from Health; that deletion flowed thru to all but this & 1 other app. (2) That other app has the standard delete feature, so I could remove the related data point. This app does not. (3) No *list* presenting the *dated* VO2Max readings. Instead, a chart, so you’re forced to play Tap City (tap dot to get specifics), repeatedly, to pull that history. //

Thankfully, I chose the monthly sub so I could inspect the entirety of the app. Result: canceled about 9 days in. Dev, great idea! Respectfully, you’ve missed too many basics. Please → tweak, polish, and indulge user testing. Then, you’d OWN the VO2Max space! (Still) Rooting for ya
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Response from developer

Thank you for the thoughtful and candid feedback. You were absolutely right that these were important basics, and I took them seriously. In the latest update, we’ve addressed the issues you mentioned by adding session deletion, a dated list view of runs and VO₂ Max readings, and improvements to data handling and overall usability. We’ve also introduced several new features, including Indoor Treadmill VO₂ Max tracking, expanded chart views, and other quality-of-life improvements. We really appreciate you taking the time to share such constructive feedback, it helped us make the app better.

FAQ

Does True VO2 Max have ads?

No, True VO2 Max is completely ad-free. The app explicitly states 'No ads' in its description, ensuring an uninterrupted user experience.

What is the pricing for True VO2 Max?

The app is free to download and use with basic features. An optional 'Plus' subscription is available for advanced features, costing $2.99 per month or $19.99 per year, both with a 7-day free trial.

How accurate is True VO2 Max?

The app aims for lab-like accuracy by correcting for environmental factors like temperature, humidity, and altitude. It provides both raw and corrected VO2 max readings for comparison.

Can I use True VO2 Max without an account?

Yes, True VO2 Max does not require an account. All logged information, including runs and corrected VO2 max data, remains on your device for privacy.

What devices does True VO2 Max support?

True VO2 Max is supported on both iPhone and Apple Watch, allowing for seamless data syncing and tracking.

How often is True VO2 Max updated?

The app was last updated on March 7, 2026, with version 2.0. This indicates a recent update and ongoing development.

What are the benefits of the 'Plus' subscription?

The 'Plus' subscription unlocks the Indoor Treadmill Watch app, instant weather capture, more accurate VO2 max correction, personalized performance takeaways, and other advanced insights.

What is the age rating for True VO2 Max?

True VO2 Max has an age rating of 4+, making it suitable for a wide range of users interested in fitness tracking.