# StretchFlow vs Calm SOS

The clearest difference is iOS requirement: StretchFlow at 15.1 against Calm SOS's 17.6. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. StretchFlow sells 1 in-app purchase, starting at $4.99 per month and Calm SOS sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | StretchFlow | Calm SOS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Size | 35 MB | 65 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Nima Norouzi](https://appshunter.io/developer/1805667925) | [THIERRY VICTOR E DE BELDER](https://appshunter.io/developer/1831371632) |

## What reviewers say

### StretchFlow

[App page](https://appshunter.io/ios/app/stretchflow/id6744036866)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StretchFlow Premium | $4.99 | per month |


### Calm SOS

[App page](https://appshunter.io/ios/app/calm-sos/id6751938184)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Monthly | $5.99 | per month |
| Yearly | $39.99 | per year |


## Frequently asked questions

### Is StretchFlow free?

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

### Is Calm SOS free?

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

### Do StretchFlow or Calm SOS have ads?

Neither StretchFlow nor Calm SOS shows ads.

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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.*