CO2 on Watch & Lockscreen vs Daily Angle
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CO2 on Watch & Lockscreen
Monitor CO2 levels from compatible devices directly on your Apple Watch and iPhone Lock Screen. Receive smart alerts and view real-time air quality data with color-coded visuals for quick understanding.
- 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
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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/
Daily Angle
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More solar yield through the right angle – recalculated every day. Adjusting your solar panel tilt angle regularly can increase your annual yield by up to 5%, depending on location and season. Tilt calculates the optimal tilt angle for today and tomorrow based on your location, sun position, and weather forecast – simply read it off and align your panels accordingly. CAMPING MODE Designed specifically for mobile solar setups: Camping Mode shows you the best tilt angle separately for morning, midday, and afternoon. Perfect if you're on the road and want to readjust several times a day to get the most out of your mobile solar system. FEATURES - Daily angle recommendation based on weather data and sun position - Next-day preview for advance planning - Uses GPS location for precise calculations WHO IS THIS APP FOR? - Owners of solar systems with adjustable mounts - Campers and van-life users with mobile solar panels - Anyone who wants to understand how sun position and weather affect the optimal angle
Screenshots
Verdict
The clearest difference is in-app purchases: Daily Angle at none against CO2 on Watch & Lockscreen's 8. CO2 on Watch & Lockscreen's advantage is update cadence (weekly vs every 2 months) and device support (3 vs 1). On price, ads and iOS requirement 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. CO2 on Watch & Lockscreen sells 8 in-app purchases, starting at $3.99 per month. Daily Angle asks for nothing beyond the download.
CO2 on Watch & Lockscreen ships an update weekly, Daily Angle every 2 months. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.
| Parameter | CO2 on Watch & Lockscreen | Daily Angle |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (2 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Weekly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 17.6 | 16.4 — better |
| Further details — not scored | ||
| Size | 28 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Kevin Floch | Sebastian Kuehner |
In-app purchases
CO2 on Watch & Lockscreen
- CO2_Monthly7 Days trial$3.991 Month
- CO2_Annually7 Days trial$29.991 Year
- Small tip$4.99
- Medium tip$9.99
- Large tip$19.99
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- CO2_Lifetime_Upgrade2$24.99
- CO2_Lifetime$49.99
- Extra large tip$49.99
Daily Angle
No in-app purchases
Questions
Is CO2 on Watch & Lockscreen free?
Is Daily Angle free?
Do CO2 on Watch & Lockscreen or Daily Angle have ads?
Which is updated more often, CO2 on Watch & Lockscreen or Daily Angle?
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