Aura CO2 vs Lex Butler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Aura CO2
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Knowing the CO2 concentration you’ll be aware of your home/office’s need for air renewal. This application will also let you know the temperature, humidity and pressure as well as outdoor air quality information, to easily act and improve your ventilation.
Lex Butler
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.
- All content in one place
- Access purchased courses
- On-the-go learning
- Personal empowerment journey
- Movement and evolution focus
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Hello Lovely Human! It's time to begin your journey toward reclaiming your energy so that you can finally accomplish your biggest dreams. The magic is already within you and with the LB app we can work together to support your empowerment, transformation and thriving life. We can't wait to grow with you -Lex
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Aura CO2 | Lex Butler |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 59 MB | 121 MB |
| Age rating | 4+ | 12+ |
| Developer | ELICHENS | Sutra Fitness, Inc. |
In-app purchases
Aura CO2
No in-app purchases
Lex Butler
No in-app purchases
