Comparison

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.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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/

About

Daily Angle

Features
Read full description

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

CO2 on Watch & Lockscreen4 screens
Daily Angle4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
CO2 on Watch & Lockscreen versus Daily Angle: the parameters behind the verdict, then further details
ParameterCO2 on Watch & LockscreenDaily Angle
PriceFreeFree
Rating1.0 (2 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings2 — better—
Update frequencyWeekly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS17.616.4 — better
Further details — not scored
Size28 MB28 MB
Age rating4+4+
DeveloperKevin FlochSebastian Kuehner

In-app purchases

8 purchases

CO2 on Watch & Lockscreen

Subscriptions2
  • CO2_Monthly7 Days trial$3.991 Month
  • CO2_Annually7 Days trial$29.991 Year
One-time6
  • Small tip$4.99
  • Medium tip$9.99
  • Large tip$19.99
Show 3 more
  • CO2_Lifetime_Upgrade2$24.99
  • CO2_Lifetime$49.99
  • Extra large tip$49.99
None

Daily Angle

No in-app purchases

Questions

Is CO2 on Watch & Lockscreen free?
CO2 on Watch & Lockscreen is free to download, with in-app purchases available.
Is Daily Angle free?
Daily Angle is free to download, with no in-app purchases.
Do CO2 on Watch & Lockscreen or Daily Angle have ads?
Neither CO2 on Watch & Lockscreen nor Daily Angle shows ads.
Which is updated more often, CO2 on Watch & Lockscreen or Daily Angle?
CO2 on Watch & Lockscreen ships an update weekly, and Daily Angle every 2 months. Most recently, CO2 on Watch & Lockscreen was updated on November 4, 2026 and Daily Angle on November 5, 2026.

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