Comparison

LaserPowerMeter vs CO2 on Watch & Lockscreen

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

LaserPowerMeter

Features
Read full description

This app can connect to the SANWU laser power meter probe through BLE bluetooth, read the built-in parameter information of the device, display the current laser power data, and can also display the power curve data over a period of time, calculate and display the minimum, maximum and average power data. The working range, wavelength and other parameters of the probe can be set through the app. The calibration function can be used in conjunction with a standard laser source to calibrate the sensor's reference point data.

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/

Screenshots

LaserPowerMeter3 screens
CO2 on Watch & Lockscreen4 screens

Verdict

The call

The clearest difference is in-app purchases: LaserPowerMeter at none against CO2 on Watch & Lockscreen's 8. LaserPowerMeter also leads on iOS requirement (12.0 vs 17.6). CO2 on Watch & Lockscreen's advantage is update cadence (weekly vs every 13 months). On price, ads and device support 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. LaserPowerMeter asks for nothing beyond the download.

UpkeepUpdate frequency

LaserPowerMeter ships an update every 13 months, CO2 on Watch & Lockscreen weekly. The most recent releases landed on November 8, 2026 and November 4, 2026 respectively.

Scorecard3 real differences · 7 level
LaserPowerMeter versus CO2 on Watch & Lockscreen: the parameters behind the verdict, then further details
ParameterLaserPowerMeterCO2 on Watch & Lockscreen
PriceFreeFree
Rating—1.0 (2 ratings) — better
Positive reviews—50.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 13 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS12.0 — better17.6
Further details — not scored
Size29 MB28 MB
Age rating4+4+
Developer爱新 周Kevin Floch

In-app purchases

None

LaserPowerMeter

No 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

Questions

Is LaserPowerMeter free?
LaserPowerMeter is free to download, with no in-app purchases.
Is CO2 on Watch & Lockscreen free?
CO2 on Watch & Lockscreen is free to download, with in-app purchases available.
Do LaserPowerMeter or CO2 on Watch & Lockscreen have ads?
Neither LaserPowerMeter nor CO2 on Watch & Lockscreen shows ads.
Which is updated more often, LaserPowerMeter or CO2 on Watch & Lockscreen?
LaserPowerMeter ships an update every 13 months, and CO2 on Watch & Lockscreen weekly. Most recently, LaserPowerMeter was updated on November 8, 2026 and CO2 on Watch & Lockscreen on November 4, 2026.

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