Physics Toolbox Sensor Suite vs CO2 on Watch & Lockscreen
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Physics Toolbox Sensor Suite
This app turns your smartphone into a scientific instrument suite, enabling measurement, recording, analysis, and export of real-time sensor data. It offers tools for kinematics, acoustics, light, magnetism, and more, suitable for students, educators, researchers, and hobbyists.
- Real-time sensor data measurement
- Data recording and analysis
- Data export functionality
- Kinematics tools (accelerometer, gyroscope)
- Acoustics tools (sound meter, oscilloscope)
- Magnetism tools (compass, magnetometer)
- AR visualization for magnetic fields and measurements
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Whether you’re a student, educator, researcher, or hobbyist, Physics Toolbox transforms your smartphone’s built-in sensors into a powerful suite of scientific instruments. Easily measure, record, analyze, and export real-time data for a variety of uses—from classroom experiments to cutting-edge research. KINEMATICS G-Force Meter Linear Accelerometer Gyroscope Inclinometer Motion Visualizer (LiDAR-tracked position and velocity) ACOUSTICS Sound Meter Tone Detector Tone Generator Oscilloscope Spectrum Analyzer Spectrogram LIGHT Light Meter Color Detector Proximeter Stroboscope MAGNETISM Compass Magnetometer Magna-AR (AR visualization of magnetic field vectors) OTHER Barometer GPS - latitude, longitude, altitude, speed, direction, number of satellites Ruler-AR (AR-estimated measurements) COMBINATION Multi Record Roller Coaster GAME Play (data-verified challenges)
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/
Screenshots
Verdict
The clearest difference is rating: Physics Toolbox Sensor Suite at 4.7 against CO2 on Watch & Lockscreen's 1.0. Physics Toolbox Sensor Suite also leads on review sentiment (81% vs 50%) and ratings volume (1.8K vs 2). On price, update cadence, ads and in-app purchases 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. Physics Toolbox Sensor Suite sells 1 one-off in-app purchase and CO2 on Watch & Lockscreen sells 8 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
Physics Toolbox Sensor Suite holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Physics Toolbox Sensor Suite has 1.8K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 81% of Physics Toolbox Sensor Suite's written reviews are positive against 50% of CO2 on Watch & Lockscreen's.
Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 18, 2026 and October 14, 2026 respectively.
| Parameter | Physics Toolbox Sensor Suite | CO2 on Watch & Lockscreen |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (1.8K ratings) — better | 1.0 (2 ratings) |
| Positive reviews | 80.8% of reviews — better | 50.0% of reviews |
| Number of ratings | 1.8K — better | 2 |
| Update frequency | Weekly | Weekly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, Apple Watch — better |
| Requires iOS | 16.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 78 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Chrystian Vieyra | Kevin Floch |
Customer experience
Physics Toolbox Sensor Suite
CO2 on Watch & Lockscreen
In-app purchases
Physics Toolbox Sensor Suite
- Upgrade to Pro$5.99
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
Questions
Is Physics Toolbox Sensor Suite free?
Is CO2 on Watch & Lockscreen free?
Which has better reviews, Physics Toolbox Sensor Suite or CO2 on Watch & Lockscreen?
Do Physics Toolbox Sensor Suite or CO2 on Watch & Lockscreen have ads?
Which is updated more often, Physics Toolbox Sensor Suite or CO2 on Watch & Lockscreen?
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