Comparison

VO2 Prime vs Just VO2 Max

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

Head to head
About

VO2 Prime

Features
Read full description

This app transforms VO2 Max and Resting Metabolic Rate (RMR) test results into daily guidance for nutrition and recovery optimization. Users can track how their body burns fat vs carbs, monitor biological age, and receive tailored insights for training and lifestyle. It provides access to personalized meal plans, recipes, and workout builders — all powered by personal metabolic analysis and breath-based testing. Key Features: • Dashboard with activity, nutrition, recovery, and metabolic data. • Personalized nutrition planning with meal plans and smart recommendations. • Training builder aligned with VO2 Max and RMR test results. • Recovery tracking with biological age and fat vs carb burn metrics.

About

Just VO2 Max

Displays your most recent VO2 Max reading from Apple Health directly on your Apple Watch face. It refreshes automatically when new data is available after your workout, keeping your health information private and on your device.

Highlights
  • VO2 Max display
  • Apple Health integration
  • Automatic refresh
  • On-device data storage
  • Read-only data access
Features
Read full description

Your VO₂ max, wherever you look first. Just VO2 Max brings your latest Apple Health estimate to three equally important places: your Apple Watch face, iPhone Home Screen, and iPhone Lock Screen. Check your value without opening an app. ON YOUR WATCH FACE Choose a circular, rectangular, or corner complication. The rectangular style also shows your trend and measurement date and time. ON YOUR HOME SCREEN Choose a small, medium, or large widget. Each shows your value, trend, and measurement date and time. The large widget adds a chart of up to six recent readings. ON YOUR LOCK SCREEN Choose a circular gauge or rectangular widget. The rectangular style shows your value, measurement date and time, and trend when available. COMPANION APPS Use the iPhone and Apple Watch apps to grant read-only Health access and view the latest reading. The Watch app updates when opened. The iPhone app also shows up to six recent readings, with controls to refresh and check setup. The iPhone dashboard adapts to iPhone Duo’s closed and unfolded displays, in portrait and landscape. SIMPLE AND PRIVATE • Free, with no account or subscription • Read-only access to VO₂ max in Apple Health • Health readings stay on your devices • No ads in widgets, complications, or the Watch app • The iPhone companion app is supported by banner ads Just VO2 Max displays estimates already stored in Apple Health. It does not measure or calculate VO₂ max. New readings depend on Apple Health and supported workouts; iOS and watchOS manage refresh timing. The trend compares your latest estimate with up to three previous readings. Your VO₂ max values, sample dates, and sources are never sent to advertising or analytics providers. The app displays fitness information only and does not provide medical advice.

Screenshots

VO2 Prime4 screens
Just VO2 Max4 screens

Verdict

The call

The clearest difference is ads: VO2 Prime at none against Just VO2 Max's shown. VO2 Prime also leads on iOS requirement (15.1 vs 17.0). Just VO2 Max's advantage is update cadence (every 6 days vs monthly). On price, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

VO2 Prime ships an update monthly, Just VO2 Max every 6 days. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 6 level
VO2 Prime versus Just VO2 Max: the parameters behind the verdict, then further details
ParameterVO2 PrimeJust VO2 Max
PriceFreeFree
Rating—5.0 (3 ratings) — better
Number of ratings—3 — better
Update frequencyMonthlyEvery 6 days — better
AdsNo — betterYes
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPod, Apple Watch — betteriPhone, Apple Watch
Requires iOS15.1 — better17.0
Further details — not scored
Size62 MB14 MB
Age rating17+4+
DeveloperEndoMedical IncCuprea s.r.o.

In-app purchases

None

VO2 Prime

No in-app purchases

None

Just VO2 Max

No in-app purchases

Questions

Is VO2 Prime free?
VO2 Prime is free to download, with no in-app purchases.
Is Just VO2 Max free?
Just VO2 Max is free to download, with no in-app purchases.
Do VO2 Prime or Just VO2 Max have ads?
Just VO2 Max shows ads; VO2 Prime does not.
Which is updated more often, VO2 Prime or Just VO2 Max?
VO2 Prime ships an update monthly, and Just VO2 Max every 6 days. Most recently, VO2 Prime was updated on October 21, 2026 and Just VO2 Max on October 24, 2026.

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