# iBac PRO vs CastleFit

The clearest difference is update cadence: CastleFit at every 2 weeks against iBac PRO's every 6 weeks. iBac PRO's advantage is iOS requirement (12.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iBac PRO ships an update every 6 weeks, CastleFit every 2 weeks. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | iBac PRO | CastleFit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (2 ratings)](https://appshunter.io/ios/app/castlefit/id6786671032/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 16 MB | 45 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Alcosystems Sweden AB](https://appshunter.io/developer/639771620) | [Castle Flexx](https://appshunter.io/developer/1695941246) |

## What reviewers say

### iBac PRO

[App page](https://appshunter.io/ios/app/ibac-pro/id1310569251)

**Features:** macOS Compatibility

**In-app purchases:** none


### CastleFit

[App page](https://appshunter.io/ios/app/castlefit/id6786671032)

This app offers guided stretching and mobility sessions to relieve pain, improve flexibility, and aid recovery. It provides routines for various needs, from injury recovery to pre-training warm-ups, all accessible at home.

**Highlights:** Guided stretch and mobility sessions, Targeted relief for specific body parts, HD instructional videos, Sessions organized by age, ability, and goals, Active and passive stretching routines, Device lineup browsing and purchasing

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

**In-app purchases:** none


## Frequently asked questions

### Is iBac PRO free?

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

### Is CastleFit free?

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

### Do iBac PRO or CastleFit have ads?

Neither iBac PRO nor CastleFit shows ads.

### Which is updated more often, iBac PRO or CastleFit?

iBac PRO ships an update every 6 weeks, and CastleFit every 2 weeks. Most recently, iBac PRO was updated on October 26, 2026 and CastleFit on October 22, 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.*