# VO2 Max Calculator vs CalmingVibration

The clearest difference is chart position: CalmingVibration at #189 against VO2 Max Calculator's unranked. CalmingVibration also leads on iOS requirement (13.0 vs 15.6). VO2 Max Calculator's advantage is ratings volume (14 vs 3). On price, rating, review sentiment and update cadence there is nothing between them.

VO2 Max Calculator costs $1.99 and CalmingVibration $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 2.4 for VO2 Max Calculator against 2.3 for CalmingVibration. Both are backed by a comparable volume of ratings — 14 and 3 respectively. Written reviews are what separate them: 38% of VO2 Max Calculator's written reviews are positive against 33% of CalmingVibration's.

VO2 Max Calculator ships an update every 7 months, CalmingVibration every 4 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | VO2 Max Calculator | CalmingVibration |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | **[2.4 (14 ratings)](https://appshunter.io/ios/app/vo2-max-calculator/id1586812282/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/calmingvibration/id6748665954/reviews) |
| Number of ratings | **14** | 3 |
| Positive reviews | **38.5% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#189** |
| Size | 1 MB | 1 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Theo Scott](https://appshunter.io/developer/691156625) | [Raffaele De Lorenzo](https://appshunter.io/developer/339434366) |

## What reviewers say

### VO2 Max Calculator

[App page](https://appshunter.io/ios/app/vo2-max-calculator/id1586812282)

This app calculates your VO2 Max in just 3 minutes using a simple heart rate method. It's based on scientific research and provides general health information, not medical advice.

**Highlights:** Passive VO2 Max reading, 3-minute calculation, Based on scientific research, General health information, Video tutorial available

**Features:** Apple Watch app

**In-app purchases:** none


### CalmingVibration

[App page](https://appshunter.io/ios/app/calmingvibration/id6748665954)

**Currently charting:** #189 Top Paid · Health & Fitness (US App Store)

This app uses your Apple Watch's haptic engine to deliver rhythmic vibrations for stress relief and focus. It integrates with HealthKit to monitor stress indicators and offers personalized haptic sessions tailored to your needs.

**Highlights:** Haptic-driven relaxation, Smart stress detection using HealthKit, Personalized haptic sessions, Real-time stress monitoring, Customizable session durations and types, User-friendly interface

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is VO2 Max Calculator free?

VO2 Max Calculator costs $1.99, with no in-app purchases.

### Is CalmingVibration free?

CalmingVibration costs $1.99, with no in-app purchases.

### Which has better reviews, VO2 Max Calculator or CalmingVibration?

VO2 Max Calculator is rated higher. VO2 Max Calculator averages 2.4 out of 5 from 14 ratings, while CalmingVibration averages 2.3 from 3 ratings.

### Do VO2 Max Calculator or CalmingVibration have ads?

Neither VO2 Max Calculator nor CalmingVibration shows ads.

### Which is updated more often, VO2 Max Calculator or CalmingVibration?

VO2 Max Calculator ships an update every 7 months, and CalmingVibration every 4 months. Most recently, VO2 Max Calculator was updated on November 3, 2026 and CalmingVibration on November 5, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*