# VO2 Prime vs interfasting

The clearest difference is in-app purchases: VO2 Prime at none against interfasting's 2. VO2 Prime also leads on iOS requirement (15.1 vs 18.5). interfasting's advantage is update cadence (every 5 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. interfasting sells 2 in-app purchases, starting at $9.99 per month. VO2 Prime asks for nothing beyond the download.

VO2 Prime ships an update monthly, interfasting every 5 days. The most recent releases landed on October 21, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | VO2 Prime | interfasting |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/interfasting/id6751507755/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | — | Free |
| Size | 62 MB | 3 MB |
| Requires iOS | **15.1** | 18.5 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [EndoMedical Inc](https://appshunter.io/developer/1290814301) | [Ivan Morel](https://appshunter.io/developer/1497560273) |

## What reviewers say

### VO2 Prime

[App page](https://appshunter.io/ios/app/vo2-prime/id6748883572)

**Features:** Apple Watch app

**In-app purchases:** none


### interfasting

[App page](https://appshunter.io/ios/app/interfasting/id6751507755)

This app helps users achieve wellness goals through intermittent fasting. It offers custom fasting plans, real-time progress tracking, and detailed statistics on fasting success and weight changes. The app prioritizes privacy with local data storage and no account creation required.

**Highlights:** Custom fasting plans (16:8, 18:6, 20:4), Real-time progress countdown, Session history and statistics, Weight tracking and visualization, Success/failure tracking, Data export for healthcare providers, Local data storage for privacy

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| InterFasting Pro | $9.99 | per month |
| InterFasting Pro (Yearly) | $108.99 | per year |


## Frequently asked questions

### Is VO2 Prime free?

VO2 Prime is free to download, with no in-app purchases.

### Is interfasting free?

interfasting is free to download, with in-app purchases available.

### Do VO2 Prime or interfasting have ads?

Neither VO2 Prime nor interfasting shows ads.

### Which is updated more often, VO2 Prime or interfasting?

VO2 Prime ships an update monthly, and interfasting every 5 days. Most recently, VO2 Prime was updated on October 21, 2026 and interfasting on October 9, 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.*