# iFour Core vs Onyx Physical Therapy

The clearest difference is in-app purchases: Onyx Physical Therapy at none against iFour Core's 2. iFour Core's advantage is update cadence (every 2 months vs every 9 months) and iOS requirement (11.0 vs 15.1). On price, ads and device support there is nothing between them.

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

iFour Core ships an update every 2 months, Onyx Physical Therapy every 9 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | iFour Core | Onyx Physical Therapy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (28 ratings)](https://appshunter.io/ios/app/ifour-core/id1525317554/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 39 MB | 43 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [ifour.life, LLC](https://appshunter.io/developer/1525317556) | [Onyx Physical Therapy and Wellness Inc.](https://appshunter.io/developer/1663521484) |

## What reviewers say

### 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 |


### Onyx Physical Therapy

[App page](https://appshunter.io/ios/app/onyx-physical-therapy/id1663521482)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iFour Core free?

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

### Is Onyx Physical Therapy free?

Onyx Physical Therapy is free to download, with no in-app purchases.

### Do iFour Core or Onyx Physical Therapy have ads?

Neither iFour Core nor Onyx Physical Therapy shows ads.

### Which is updated more often, iFour Core or Onyx Physical Therapy?

iFour Core ships an update every 2 months, and Onyx Physical Therapy every 9 months. Most recently, iFour Core was updated on October 24, 2026 and Onyx Physical Therapy on October 7, 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.*