# Aura CO2 vs Ambient

The clearest difference is update cadence: Ambient at every 3 days against Aura CO2's every 3 months. 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.

Aura CO2 ships an update every 3 months, Ambient every 3 days. The most recent releases landed on November 7, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Aura CO2 | Ambient |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 59 MB | 46 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Elichens](https://appshunter.io/developer/1538561088) | [ELMO OSKARI SAUKKO](https://appshunter.io/developer/1773725956) |

## What reviewers say

### Aura CO2

[App page](https://appshunter.io/ios/app/aura-co2/id1565190899)

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

**In-app purchases:** none


### Ambient

[App page](https://appshunter.io/ios/app/ambient-relax-focus-sleep/id6757758600)

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

**In-app purchases:** none


## Frequently asked questions

### Is Aura CO2 free?

Aura CO2 is free to download, with no in-app purchases.

### Is Ambient free?

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

### Do Aura CO2 or Ambient have ads?

Neither Aura CO2 nor Ambient shows ads.

### Which is updated more often, Aura CO2 or Ambient?

Aura CO2 ships an update every 3 months, and Ambient every 3 days. Most recently, Aura CO2 was updated on November 7, 2026 and Ambient on November 6, 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.*