# viiiv vs iFour Core

The clearest difference is in-app purchases: viiiv at none against iFour Core's 2. iFour Core's advantage is ratings volume (28 vs 2). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. iFour Core sells 2 in-app purchases, starting at $5.99 per month. viiiv asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for viiiv against 5.0 for iFour Core. That said, the two scores are not equally well evidenced: iFour Core has 28 ratings behind it against 2, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 10, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | viiiv | iFour Core |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/viiiv/id1414467092/reviews) | [5.0 (28 ratings)](https://appshunter.io/ios/app/ifour-core/id1525317554/reviews) |
| Number of ratings | 2 | **28** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 36 MB | 39 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Less Is More LLC](https://appshunter.io/developer/1224697876) | [ifour.life, LLC](https://appshunter.io/developer/1525317556) |

## What reviewers say

### viiiv

[App page](https://appshunter.io/ios/app/viiiv/id1414467092)

This app facilitates isometric strength training by connecting to specialized hardware. It allows users to select from various exercises, track real-time force data, and view progress reports with trend graphs. Users can log their sessions, create group accounts for clients, and share detailed performance summaries.

**Highlights:** 8+ isometric exercises, Real-time force data graphing, User account for data logging, Group accounts for clients, Progress reports with trend lines, Sharable 2-page session reports

**Features:** macOS Compatibility

**In-app purchases:** none


### iFour Core

[App page](https://appshunter.io/ios/app/ifour-core/id1525317554)

This app offers a personalized core workout program designed by physical therapists. It adapts to your individual anatomy and fitness level, providing daily workouts under 10 minutes with video demonstrations. Access nutrition guides and trainer support as a member.

**Highlights:** Personalized core workout program, Physical therapy approved exercises, Daily workouts under 10 minutes, Video demonstrations of exercises, Nutrition guides and support, Fitness test for customized plans

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Annually | $29.99 | per year |


## Frequently asked questions

### Is viiiv free?

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

### Is iFour Core free?

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

### Which has better reviews, viiiv or iFour Core?

viiiv and iFour Core are both rated 5.0 out of 5 on the App Store, from 2 and 28 ratings respectively.

### Do viiiv or iFour Core have ads?

Neither viiiv nor iFour Core shows ads.

### Which is updated more often, viiiv or iFour Core?

viiiv ships an update every 2 months, and iFour Core every 2 months. Most recently, viiiv was updated on October 10, 2026 and iFour Core on October 4, 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.*