Appworthy

VO2 Max Trainer: HIIT, Zone 2

PACER, Beep, Cooper Test, 4x4

Kevin Floch
Download on theApp Store
App Store rating4.0★4 ratings
PriceFreeIn-app $1.99–$49.99
Age4+Store age rating
Size300 MBiPhone download
CategoryHealth & Fitness
DeveloperKevin Floch

What we found

Full report

Too little checked to say Store information only. We haven’t analysed this app or read its reviews yet.

Money

  • Free to download · in-app purchases $1.99–$49.99 (10 listed, the most the App Store shows). The store doesn’t say how often these bill.
  • If you subscribe through the store, cancel in iPhone Settings → your name → Subscriptions. Deleting the app doesn’t cancel a subscription.

Not yet tested.

The store currently lists version 4.4.1, updated 2026-10-14.

Preview

Screenshot 1Screenshot 2Screenshot 3Screenshot 4Screenshot 5Screenshot 6Screenshot 7Screenshot 8

Store screenshots supplied by the developer.

About this app

Boost your VO2 max, one of the strongest predictors of endurance performance and of how long and how well you live. Measure your true VO2 max in 15 minutes or less, raise it with Zone 2 and HIIT workouts, and beat the rest of the world on a verified global leaderboard. iPhone and Apple Watch.

NEW: GHOST RACE

Race a ghost during your Cooper test, Balke test or 1.5 mile (2.4 km) run. Pick your best run, your 12-week goal, the athlete 10 places above you on the leaderboard, the #1 of your age group, an Olympic record, or any VO2 max you choose. The gap shows live in meters or yards, green when you lead and orange when you chase, with voice cues when you pass or get passed. Follow the race on the Lock Screen, in the Dynamic Island and on your Apple Watch, even without your iPhone. The result saves as a normal test, and you can share a "Me vs ghost" card.…

From the developer’s store description.

For developers and the curious

The full report

The evidence, sources, measurements and versions behind every label above.

Findings and evidence

Not yet tested
Not yet tested. No analysis has been published for this app. A missing label is not a clean bill of health.

What reviewers report

No review coverage

No review analysis published for this app.

Measurements

3 measured · 5 not assessed

“Not assessed” means we could not measure it. It is never a zero and never a pass.

From store data and reviews

Developer replies to reviews
Not assessed
Fewer than 50 reviews scanned — too few to state a rate
Price in the store description
The store description doesn’t list prices (most don’t)
Cancelling, in the store description
The store description doesn’t say how to cancel (most don’t)
Themes reported by reviewers
Not assessed
This app's reviews have not been assessed yet
Five-star share of ratings
65–79% five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.

In the app package we scanned

No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence, not a finding.

Sensitive permissions
Not assessed
No package has been scanned for this app
Analytics or tracking SDKs in the scanned package
Not assessed
No package has been scanned for this app
Advertising SDKs in the scanned package
Not assessed
No package has been scanned for this app
How we know

Supporting measurements: not a complete list of possible harms or positives. Measurement vocabulary 1.4 · how these are measured

Versions and dates analysed

Not yet tested

Not yet tested. No analysis has been run for this app, so there is no version or date to report.

Store update history

Each store’s release notes, as the developer wrote them. They are the developer’s words, not ours.

App Store

Version 4.4.1 · 2026-10-14
Ghost Race is here. Run your Cooper test, Balke test or 1.5 mile run against a ghost: your best run, your 12-week goal, the athlete 10 places above you, the #1 of your age group, an Olympic record, or any VO2 max you pick. - Tap RACE next to START RUN - See the gap live, green when you lead, orange when you chase - Voice cues and a flash when you pass or get passed - Follow the race on the Lock Screen, Dynamic Island and Apple Watch, even without your iPhone - Your result saves as a normal test, with the race on top. Race again, or share "Me vs ghost" Built by one developer. If you like the update, a rating on the App Store helps a lot.

Assessment record

Status
Not yet tested
App identifier
vo2-max-trainer
Sources used
None recorded
Reviews read
None recorded
Package examined
No package scan
Human inspection
Not completed
How we know
Measurement vocabulary
1.4

Store facts

App Store

What the stores publish. Store ratings are the stores’ numbers, not Appworthy’s, and are never averaged across stores.

App Store

Store rating
4.00 ★ · 4 ratings
Version
4.4.1
Updated
14 Oct 2026
Price
Free · In-app purchases
Age rating
4+
Size
300 MB
Open in App Store
Developer
Kevin Floch
Category
Health & Fitness
Listing price
Free · In-app purchases

Purchases the store lists

 What this app sells

From the store listing. Billing terms are read from each purchase’s name — the stores don’t publish them — so treat them as a strong hint, not a disclosure.

Show 10 more purchases we couldn’t categorise

These are really on sale; we just can’t tell from the name whether they recur.

VO2_MonthlyTerm not stated$1.99
VO2_AnnuallyTerm not stated$29.99
VO2_Lifetime2Term not stated$49.99
VO2_WeeklyTerm not stated$1.99
VO2_Annually_OfferTerm not stated$14.99
Medium tipTerm not stated$9.99
Large tipTerm not stated$19.99
Small tipTerm not stated$4.99
Extra large tipTerm not stated$39.99
VO2_Lifetime_Upgrade2Term not stated$24.99
This list is cut off. Apple shows at most 10 in-app purchases, and this app is at the limit — so it very likely sells more than we can see.

Method and limits

What this report can and cannot show

What a missing label means

Not yet tested. No analysis has been published for this app, so there is no method to describe for it yet. A missing label is not a clean bill of health: it means nothing has been read, not that nothing is wrong.

Limits of this report

  • A package scan is static. It identifies code and text in one Android build. It does not measure a live ad session, test a deletion request, or count the steps needed to cancel.
  • Reviews keep their sample. A review-only charge shows distinct reviewers, the share and the sample size, and is published only once it clears that label’s published threshold. Calibration labels are machine-drafted and not yet confirmed by a person.
  • Not assessed is a state. It is never a zero and never a pass.
  • A missing label is not a clean bill of health. It means the evidence did not support one, not that the app is problem-free.
Not yet human-reviewed. A human review gives an app hands-on, recorded measurements. None has been run for this app. Hands-on inspections are not yet open.
Review thresholds Read the methodology For developers

Request a correction

[email protected]

Write to [email protected], or use the form. Name the finding, the app version and the evidence that needs correcting. Factual corrections are free and never depend on buying anything.

Report a factual error — free Email a correction