# Stretch Affect vs CastleFit

The clearest difference is update cadence: CastleFit at every 2 weeks against Stretch Affect's every 5 months. Stretch Affect's advantage is iOS requirement (11.0 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.

Stretch Affect ships an update every 5 months, CastleFit every 2 weeks. The most recent releases landed on October 29, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Stretch Affect | 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 5 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 50 MB | 45 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stretch Affect LLC](https://appshunter.io/developer/1504743026) | [Castle Flexx](https://appshunter.io/developer/1695941246) |

## What reviewers say

### Stretch Affect

[App page](https://appshunter.io/ios/app/stretch-affect/id1504743027)

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

**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 Stretch Affect free?

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

### Is CastleFit free?

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

### Do Stretch Affect or CastleFit have ads?

Neither Stretch Affect nor CastleFit shows ads.

### Which is updated more often, Stretch Affect or CastleFit?

Stretch Affect ships an update every 5 months, and CastleFit every 2 weeks. Most recently, Stretch Affect was updated on October 29, 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.*