# Aura CO2 vs Lex Butler

The clearest difference is iOS requirement: Aura CO2 at 14.0 against Lex Butler's 16.4. 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.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on December 20, 2025 and September 13, 2026 respectively.

## The numbers

| Metric | Aura CO2 | Lex Butler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/lex-butler/id6462453960/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | — | Free |
| Size | 59 MB | 121 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [ELICHENS](https://appshunter.io/developer/1538561088) | [Sutra Fitness, Inc.](https://appshunter.io/developer/914371834) |

## What reviewers say

### Aura CO2

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Lex Butler

[App page](https://appshunter.io/ios/app/lex-butler/id6462453960)

Access all your content and courses from a dedicated platform. This app supports your journey to personal empowerment through movement, evolution, and exploration. Start your path to a more empowered self today.

**Highlights:** All content in one place, Access purchased courses, On-the-go learning, Personal empowerment journey, Movement and evolution focus

**Features:** macOS Compatibility, Apple Wallet, 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 Lex Butler free?

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

### Do Aura CO2 or Lex Butler have ads?

Neither Aura CO2 nor Lex Butler shows ads.

### Which is updated more often, Aura CO2 or Lex Butler?

Aura CO2 ships an update every 3 months, and Lex Butler every 3 months. Most recently, Aura CO2 was updated on December 20, 2025 and Lex Butler on September 13, 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.*