# Calm SOS vs Bilateral Calm

The clearest difference is in-app purchases: Bilateral Calm at none against Calm SOS's 3. Bilateral Calm also leads on update cadence (every 3 days vs every 3 months) and iOS requirement (15.1 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. Calm SOS sells 3 in-app purchases, starting at $2.99 per 7 days. Bilateral Calm asks for nothing beyond the download.

Calm SOS ships an update every 3 months, Bilateral Calm every 3 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Calm SOS | Bilateral Calm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 65 MB | 180 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [THIERRY VICTOR E DE BELDER](https://appshunter.io/developer/1831371632) | [Mood and Sleep Clinic LLC](https://appshunter.io/developer/6777792306) |

## What reviewers say

### 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 |


### Bilateral Calm

[App page](https://appshunter.io/ios/app/bilateral-calm/id6777792304)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calm SOS free?

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

### Is Bilateral Calm free?

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

### Do Calm SOS or Bilateral Calm have ads?

Neither Calm SOS nor Bilateral Calm shows ads.

### Which is updated more often, Calm SOS or Bilateral Calm?

Calm SOS ships an update every 3 months, and Bilateral Calm every 3 days. Most recently, Calm SOS was updated on October 30, 2026 and Bilateral Calm on October 31, 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.*