# Flex vs Lower Back Stretching

The clearest difference is in-app purchases: Lower Back Stretching at none against Flex's 2. Flex's advantage is iOS requirement (13.4 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Flex sells 2 in-app purchases, starting at $13.99 per month. Lower Back Stretching asks for nothing beyond the download.

Flex ships an update every 3 months, Lower Back Stretching every 2 months. The most recent releases landed on September 10, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Flex | Lower Back Stretching |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Size | 70 MB | 4 MB |
| Requires iOS | **13.4** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [CAPNKLUTCH](https://appshunter.io/developer/1772032590) | [Derek Gallardo](https://appshunter.io/developer/6771575124) |

## What reviewers say

### Flex

[App page](https://appshunter.io/ios/app/flex-stretch/id6736611703)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $13.99 | per month |
| Premium Annual | $39.99 | per year |


### Lower Back Stretching

[App page](https://appshunter.io/ios/app/lower-back-stretching/id6773747358)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flex free?

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

### Is Lower Back Stretching free?

Lower Back Stretching is free to download, with no in-app purchases.

### Do Flex or Lower Back Stretching have ads?

Neither Flex nor Lower Back Stretching shows ads.

### Which is updated more often, Flex or Lower Back Stretching?

Flex ships an update every 3 months, and Lower Back Stretching every 2 months. Most recently, Flex was updated on September 10, 2026 and Lower Back Stretching on September 14, 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.*