Zone 2 AI: Vo2 Max & Endurance

Zone 2 AI: Vo2 Max & Endurance

Heart Rate Zones Training

91 ratings
28 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • March 16, 2025
  • July 17, 2026

Features

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About

This app guides you through personalized Zone 2 and high-intensity sprint training protocols to improve mitochondrial efficiency and maximize VO2 Max. It offers real-time feedback, projects future health outcomes, and tracks your progress towards longevity goals.

Personalized Zone 2 training guidance
Norwegian 4x4 Sprint Protocol
Rate of Perceived Effort (RPE) feedback
Zone2AI Power Score calculation
Projected biological age and VO2 Max
Apple Watch haptic feedback
Syncs with Apple Health and other wearables
Show original description
+1

What's New in Zone 2 AI

2.3.9

July 17, 2026

Zone2AI keeps getting better, and this update is all about making every workout count: Instant Garmin sync: your workout history flows in quickly and reliably from the moment you connect, so your training picture is always up to date. A more powerful 4x4 sprint: choose Indoor or Outdoor for your sprints — with full GPS route and distance outdoors — pause freely mid-protocol, and see every completed sprint credited toward your progress. Your complete training picture: History now shows every workout from the last 28 days, with clear labels showing which sessions count toward your weekly goal and exactly what each one needs to qualify. A coach that speaks your units: kilometers or miles, your AI coach uses your preferred units everywhere. A friendlier Garmin setup: a smoother pairing flow, plus a new quick guide that shows exactly how Zone2AI works on your watch. Plus ongoing polish and refinements throughout.

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Subscription plans

Weekly Premium Access

Weekly subscription to all access premium features

$3.997 Days
How to cancel Zone 2 AI subscription ⁉️
11

In-App Purchases

$29.99

Lifetime

Pay once. Pro access forever.

User reviews

So good

Takes the guess work out.

Apple Watch Series 3

I have been saying to start targeting my heart health more. I life 5 days a week and I am I great fiscal shape but I know I need to working more on my heart health.

I have been hearing about Zone 2 triangle for some time and want to integrate that into my training program

I found the app last night and it seems to be perfect I downloaded it, set it up on my iPhone but it’s not on the Apple Watch.. now I know my series 3 is a bit old but I would assume it would work…

I tied to get help using the AI tool in the app and it does not work for helping with the app..

I searched in line and there’s little to now help.

I did find a posthaste app will not work on a series 3..

It seems to be more effort than it’s worth.. apps do not need to be this complicated.. it should be like any other app.. download set up then use..

I purchased the lifetime subscription for something it seems will not work.
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Many noticable glitches

The app freezes during mirroring in sprint session. It mentions the norwegian 4x4, but there is no clear way to log it. The coaching insights often give false info, as if a person hasn’t done a session. These are just a few things. It definitely needs to be revamped

Has a lot of potential

Love the concept of this app, it’s just pretty buggy. It doesn’t accurately track your workouts, I’m primarily using this for the zone 2 heart rate indicator.

Response from developer

Hi Tim, thank you for the feedback, and for rooting for us. Love to hear that you like the core concept and the live Zone 2 indicator. You're right that workout tracking has had some bugs on some Garmin watches, but we've recently shipped a string of updates aimed at fixing exactly this. I'd love to get your specific setup tracking perfectly. Could you email me directly at support@zone2ai.com? I read every message and will work with you personally to get your data logging accurately every single time. I want to earn those extra stars! Best, Rod

Where is the free trial?

I will not blindly pay for something without trying first. Deleted the second I got to the subscription page.

Response from developer

Hi Richie, i understand that you do not want to pay blindly for something you haven't tried, and i respect that. We don't have a traditional free trial right now, but we do have a low-cost weekly option ($2) specifically so you can test the full app without a major commitment. If it's not for you, you can easily request a refund through Apple. I built this to be a tool you genuinely value, which is why we also offer a one-time Lifetime license so you can just own it forever with no recurring billing. If you're open to giving it another look, I'd love the chance to win you over. Please reach out to me directly at support@zone2ai.com. Best, Rod, Founder Zone2Ai

Developer apps

FAQ

What does Zone 2 AI do?

Zone 2 AI provides a complete longevity protocol by combining steady-state Zone 2 training for mitochondrial efficiency with the Norwegian 4x4 Sprint Protocol to maximize VO2 Max. It offers personalized weekly prescriptions based on your biological data and validates your effort to project future health.

What are the key features of Zone 2 AI?

Key features include RPE feedback to improve heart rate ranges, the Sprint Protocol for VO2 Max enhancement, a Zone2AI Power Score to measure metabolic efficiency, future health projections, and incline calibration for treadmill training. It also offers true Zone 2 validation and Apple Watch haptics.

How much does Zone 2 AI cost?

The app is available for free with in-app purchases. Specific pricing details for premium features or subscriptions are not detailed in the provided description, but the core functionality is accessible.

What devices is Zone 2 AI compatible with?

Zone 2 AI works with Apple Watch and syncs with Apple Health. It also integrates with other popular fitness trackers like Polar, Garmin, Strava, and WHOOP, as long as they write workout data to Apple Health.

Who is Zone 2 AI for?

This app is designed for anyone seeking to build a consistent Zone 2 training habit, from beginners to high-performance individuals. It's ideal for biohackers, endurance athletes, and anyone optimizing for mitochondrial health and longevity.