# CO2 on Watch & Lockscreen — For Aranet4, Airvalent Inkbird

> Apple Watch and Lock Screen CO2 monitoring companion for Aranet4, Airvalent, Inkbird. (iPhone/iPad app by Kevin Floch.)

- Source: https://appshunter.io/ios/app/co2-on-watch-and-lockscreen/id6738605498 (this page in markdown: same URL + `.md`)
- Developer: [Kevin Floch](https://appshunter.io/developer/1772752224)
- Category: Utilities
- Price: Free with in-app purchases
- Rating: 1.00/5 from 2 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 28 MB
- Languages: American English
- Released: 2025-01-18
- Data updated: 2026-06-04
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/co2-on-watch-and-lockscreen/id6738605498/reviews.md

## What is CO2 on Watch & Lockscreen?

Enhance your Aranet4, Airvalent or Inkbird IAM-T1 monitoring experience with an app focused on Apple Watch integration and Lock Screen widgets.
(this is a companion app focusing on Apple Watch integration and Lock Screen visibility; for the original features, please use the official apps).

KEY FEATURES:
- Apple Watch Integration: Monitor CO₂ levels directly from your wrist with multiple complication styles (including a 3hr history graph)
- Lock Screen Widgets: Keep CO₂ readings visible at all times on your iPhone
- Smart Alerts: Customizable CO₂ threshold notifications
- Background Monitoring: Continuous tracking even when the app isn't active
- Live activity: for real-time monitoring
- Color-coded Visuals: Quick understanding of air quality status

DEVICE COMPATIBILITY:
- Works with Aranet4, Airvalent and Inkbird IAM-T1 devices.

The app is free to test and connect to your device, with in-app purchases available for premium features.

This app is licensed under the standard Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Apple Watch complications with history graph
- iPhone Lock Screen widgets
- Customizable CO2 threshold alerts
- Background monitoring
- Live Activity for real-time data
- Color-coded air quality visuals

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| CO2_Annually | $9.99 | per year |
| CO2_Monthly | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| CO2_Lifetime_Upgrade2 | $14.99 | one-time |
| CO2_Lifetime | $24.99 | one-time |
| Large tip | $19.99 | one-time |
| Medium tip | $9.99 | one-time |
| Small tip | $4.99 | one-time |
| Extra large tip | $49.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/co2-on-watch-and-lockscreen/id6738605498/reviews.md

### 1/5 — Its too confusing

*2025-12-20*

While the idea is nice, the app is structured so I couldn’t figure out how to do anything. Its good that there is a free option, but I still can’t use it - it just doesn’t make sense.

**Developer response:** Hello, thank you for the feedback. Please, send me an email so that we can look into your confusion, because at the moment it's not clear to me what is the issue, and no-one has ever voiced such a concern. Contact email: techcare.net.contact@gmail.com 
Thank you, 
Tech Care.

### 1/5 — Scam

*2025-11-16*

Not the real app. DO NOT USE

**Developer response:** It is clearly written in the app description: 
"NOTE: This is a companion app focusing on Apple Watch integration and Lock Screen visibility. For the original features, please use the official apps."

### 5/5 — Excellent 3rd Party Addition

*2025-11-13, version 2.1*

Great app, looks good and it’s very helpful filling in gaps of the 1st party app. The widgets are beautiful.

### 5/5 — Great app and customer support

*2025-11-08, version 2.1*

Very useful app, and responsive customer support. 

Recommend for any iOS user with Aranet.

Bonus request: please allow family sharing for lifetime access

## Frequently asked questions about CO2 on Watch & Lockscreen

### What devices does CO2 on Watch & Lockscreen support?

CO2 on Watch & Lockscreen supports Aranet4, Airvalent, and Inkbird IAM-T1 devices. It acts as a companion app to enhance the monitoring experience on Apple Watch and iPhone.

### How does CO2 on Watch & Lockscreen work with Apple Watch?

The app offers Apple Watch integration with multiple complication styles, including a 3-hour history graph, allowing you to monitor CO2 levels directly from your wrist.

### Can I see CO2 levels on my iPhone without opening the app?

Yes, CO2 on Watch & Lockscreen provides Lock Screen widgets for your iPhone, allowing you to keep CO2 readings visible at all times without needing to open the application.

### Does CO2 on Watch & Lockscreen offer alerts for high CO2 levels?

Yes, the app features smart alerts that are customizable based on CO2 thresholds. You will receive notifications when levels exceed your set limits.

### What are the subscription options for CO2 on Watch & Lockscreen?

CO2 on Watch & Lockscreen offers monthly and annual subscription plans. The monthly plan is $1.99 with a 7-day free trial, and the annual plan is $9.99 with a 7-day free trial.

### Is CO2 on Watch & Lockscreen free to use?

The app is free to test and connect to your device. However, premium features are available through in-app purchases, including monthly and annual subscriptions.

### How often is CO2 on Watch & Lockscreen updated?

The latest version of CO2 on Watch & Lockscreen is 3.0.6, which was last updated on March 18, 2026. This indicates a recent update, suggesting ongoing development and support.

### What is the age rating for CO2 on Watch & Lockscreen?

CO2 on Watch & Lockscreen has an age rating of 4+. This means it is suitable for children aged 4 and older, with no mature content.

## Version history (last 5 releases)

### 3.0.6 — 2026-03-18

-v3.0.6: Fix for lifetime upgrade purchase and renewal of premium.

### 3.0.3 — 2026-03-01

v3.0.2: - New design on iPhone- Quick reconnect to past known device- Rebreathed air % toggle- New battery alert- Clearer Apple Watch screen- Submit and vote for features- Minor UX Update

### 3.0.2 — 2026-02-28

v3.0.2: - New design on iPhone- Quick reconnect to past known device- Rebreathed air % toggle- New battery alert- Clearer Apple Watch screen- Submit and vote for features- Metadata Update

### 3.0.1 — 2026-02-27

v3.0.1:- New design on iPhone- Quick reconnect to past known device- Rebreathed air % toggle- New battery alert- Clearer Apple Watch screen- Submit and vote for features

### 2.2.3 — 2026-02-21

-2.2.3: Minor metadata changes

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## More apps by Kevin Floch

- [VO2 Max Trainer: HIIT, Zone 2](https://appshunter.io/ios/app/vo2-max-trainer-hiit-zone-2/id6736629740)
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- [HaptiCue](https://appshunter.io/ios/app/hapticue/id6740182295)
- [Vibration Memory Game: Apptics](https://appshunter.io/ios/app/vibration-memory-game-apptics/id6740833075)

All apps by Kevin Floch: https://appshunter.io/developer/1772752224

## Related topics

[aranet4](https://appshunter.io/ios/topics/aranet4) · [kevin carbone](https://appshunter.io/ios/topics/kevin-carbone) · [co2 monitor 2](https://appshunter.io/ios/topics/co2-monitor-2)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*