Comparison

CO2 on Watch & Lockscreen vs BeepDetect

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

BeepDetect

Features
Read full description

Tired of hunting through your house at 3am trying to find which smoke alarm is chirping? BeepDetect listens for low-battery chirps from smoke and CO alarms, then alerts you instantly — so you know exactly when a battery needs replacing. HOW IT WORKS • Tap "Start Listening" and set a timer (5, 10, 15, or 30 minutes) • BeepDetect analyzes audio in real time using advanced frequency detection • The moment a chirp is detected, you get an alert with sound, vibration, and notification • Tap once to order a replacement battery — delivered to your door PERFECT FOR: • Homeowners tired of middle-of-the-night alarm hunts • Seniors and those with hearing difficulty • Landlords and property managers verifying alarm status • Anyone who wants peace of mind PRIVACY FIRST BeepDetect only listens when you start a session. No always-on microphone. No audio is ever recorded or stored. Download free and never miss a chirp again.

Screenshots

CO2 on Watch & Lockscreen4 screens
BeepDetect3 screens

Verdict

The call

The clearest difference is in-app purchases: BeepDetect at none against CO2 on Watch & Lockscreen's 8. CO2 on Watch & Lockscreen's advantage is ads (none vs shown). On price, update cadence, device support 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 $1.99 per month. BeepDetect asks for nothing beyond the download.

UpkeepUpdate frequency

CO2 on Watch & Lockscreen ships an update weekly, BeepDetect fortnightly. The most recent releases landed on June 4, 2026 and September 25, 2026 respectively.

Scorecard2 real differences · 8 level
CO2 on Watch & Lockscreen versus BeepDetect: the parameters behind the verdict, then further details
ParameterCO2 on Watch & LockscreenBeepDetect
PriceFreeFree
Rating1.0 (2 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings2 — better—
Update frequencyWeekly — betterFortnightly
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS17.617.0 — better
Further details — not scored
Size28 MB2 MB
Age rating4+4+
DeveloperKevin FlochRuben Soto

In-app purchases

8 purchases

CO2 on Watch & Lockscreen

Subscriptions2
  • CO2_Monthly7 Days trial$1.991 Month
  • CO2_Annually7 Days trial$9.991 Year
One-time6
  • Small tip$4.99
  • Medium tip$9.99
  • CO2_Lifetime_Upgrade2$14.99
Show 3 more
  • Large tip$19.99
  • CO2_Lifetime$24.99
  • Extra large tip$49.99
None

BeepDetect

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 BeepDetect free?
BeepDetect is free to download, with no in-app purchases.
Do CO2 on Watch & Lockscreen or BeepDetect have ads?
BeepDetect shows ads; CO2 on Watch & Lockscreen does not.
Which is updated more often, CO2 on Watch & Lockscreen or BeepDetect?
CO2 on Watch & Lockscreen ships an update weekly, and BeepDetect fortnightly. Most recently, CO2 on Watch & Lockscreen was updated on June 4, 2026 and BeepDetect on September 25, 2026.

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