# Hera Leto vs Aura CO2

The clearest difference is iOS requirement: Hera Leto at 12.1 against Aura CO2's 14.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Hera Leto ships an update every 2 months, Aura CO2 every 3 months. The most recent releases landed on October 11, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Hera Leto | Aura CO2 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Size | 81 MB | 59 MB |
| Requires iOS | **12.1** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Well Being Digital Ltd](https://appshunter.io/developer/1146335059) | [Elichens](https://appshunter.io/developer/1538561088) |

## What reviewers say

### Hera Leto

[App page](https://appshunter.io/ios/app/hera-leto/id1330527783)

**Features:** macOS Compatibility

**In-app purchases:** none


### Aura CO2

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hera Leto free?

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

### Is Aura CO2 free?

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

### Do Hera Leto or Aura CO2 have ads?

Neither Hera Leto nor Aura CO2 shows ads.

### Which is updated more often, Hera Leto or Aura CO2?

Hera Leto ships an update every 2 months, and Aura CO2 every 3 months. Most recently, Hera Leto was updated on October 11, 2026 and Aura CO2 on October 3, 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.*