Zone 2 AI: Vo2 Max & Endurance

Name: Zone 2 AI: Vo2 Max & Endurance
Rating: 4.5 (71 reviews)
Author: Unbounded Technologies LLC

By: Unbounded Technologies LLC

Heart Rate Zones Training

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Features & Capabilities

Zone 2 AI is a precision training app that validates true Zone 2 sessions by filtering Apple Health data, and combines steady-state cardio with Norwegian 4x4 sprints to drive VO2 max and endurance. It provides RPE feedback, a Zone2AI Power Score, incline calibration, a weekly dose, and privacy-first, on-device insights for a personalized longevity-focused plan.

Designed for beginners to high performers, Zone 2 AI supports Apple Watch, Polar, Garmin, Strava, and more via Apple Health, with no ads and no data selling. It is built to optimize metabolic health and biological aging while protecting user privacy.

User Growth & Download Statistics

App Sports AI Analytics

By:

Unbounded Technologies LLC

Rating:

4.50

(71) 7 new ratings

Version:

2.3.5 Last updated: 2026-06-04

Version code:

886504478

Creation date:

2025-03-16

Compatible devices:

Size:

81.95MB

URLs:

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-06

Compare stats and ranking:

Ranking

# 172,183 ▲ 6,693

For Developers

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Contact the developer

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Developed by:

Unbounded Technologies LLC

Apple Apps Store

https://apps.apple.com/us/app/zone-2-ai-vo2-max-endurance/id6742467259

User Reviews

I have multiple tracking apps that I use to track my runs, they track elevation gains time in different zones and I like to use my Apple Watch Workouts to track my runs, no matter how hard I stay in the zone 2 range, it never counts as zone 2 according to this app so I’m disappointed but ditching it. To use this app solely isn’t gonna happen especially since I can’t run vem see all my run histories on this app. You say for accuracy use this app but with all the limitations I rather not. Also I feel that this zone 2 goes all the way to tempo pace for me.

by It*****, 2026-05-21

The developers of this app are super engaged and seem committed to taking feedback from customers to improve the app. I’ll continue using it as they work to smooth outs the kinks. I see a lot of promise in what they are working to achieve. It it's been clunky to get up and running. I use a Garmin tactics and a Whoop band and apparently the app does not import data directly from Garmin. It seems to wait for it to pass through Apple Health. I could be wrong on that but regardless it's difficult. I believe they are going to figure it out. Rod has been very responsive via email.

by co*****, 2026-05-06

I’ve been using zone 2 AI: VO2 max & endurance for a month and I’ve gain some aerobic endurance already. I will continue to use it so I can start improving my pace and zone 2