As of January, 2022, the app works great. No complaints. Connected quickly via Bluetooth, immediately displayed the most recent readings and battery status. Historical charts are great for experimenting with environmental factors and seeing changes. The aranet4 Home is an expensive sensor, but it does everything it claims to do perfectly.Tap the line chart icon or any of the displayed values to view historical charts. From the graph, you can export and share the data as a CSV file.Tap the gear to adjust a sensor’s settings: frequency of readings (1, 2, 5, or 10 minutes), enable the buzzer, increase the bluetooth range, enable/disable smart home integration, update the firmware, customize the good/average/unhealthy ranges, turn on calibration mode (warning: the aranet4 is well-calibrated out of the box, and once you manually calibrate it there’s no way to go back to the factory calibration), and give the sensor a name.The app’s settings (hamburger menu) let you adjust the language (English/Latvian), units of measurement for temp and pressure, enable a fullscreen mode, and enable a mode to keep the screen on.

I really like my Aranet4. I bring it with me, in my purse. I showed my Doc that the air in his temporary office is really bad. (He’s now getting his own Aranet, AND working on improving the air quality!)My biggest complaint about the device is, after reading reviews from others, I felt I needed to purchase a 3-D printed cover and a case for Boise portable speakers to protect it in my purse. The 3-D should be part of the device. A carry case that properly fits the Aranet4 should be optional. I’ve had it about a month. This is what I think about the app:It NEEDS an Apple Watch app! The app allows a user to see only one week of data, or export 1.5 weeks. Unfortunately, anything older is lost. I wish it held a summary (at least) of more historical data. I wish the export function had options: Date range, all data, or summary by hourly or daily (date, high, low, and time)Like most apps, the display closes after a short time, but stays open on the “Aranet4 Display.” That app won’t allow changes in intervals, so I end up using two apps. When I’m at home, I monitor in 10 minute intervals; when in public I go to 1 minute measurements. I wish it was easier to change the intervals. It would be nice if it had a GPS function, to show where it was when measuring. A “Find my” wouldn’t be bad, either. Other than these improvements, my only other recommendation is to have better instructions for both the device and the apps.

Aranet makes a premier CO2 and climate monitoring device. Their app needs work: In portrait orientation (the way most people hod their phone), the graphs are stretched vertically and hard to read. Auto scaling of the axes is unpredictable and confusing. Auto reload of data is unreliable. Only way to force a plot update is to go back to home and redo the plot. Should have an update button on the plot as well as Home Screen. Plot font sizes are way too small, especially true on iPad. Axis and plot lines are too thin. X axis options are strange, why not past 6, 24, 48 hrs, past week?. No dark mode for plots. No way to view different data streams simultaneously. In portrait mode they should let you see 2 or 3 panels with your choice of data (CO2, temp, humidity, pressure). Two different toggles for screen display mode, zoom in/out and regular vs full screen. Confusing. Two different settings icons, a drop down menu for the app setting and a gear icon for the device settings. Confusing

We had an old CO2 monitor that constantly had to be taken out doors and recalibrated. Finally we looked for something better and found it with the Aranet sensor and this app.Tivial setup and so reliable and easy to use! Highly recommended.We use the monitor to determine when to increase the speed on our air exchange system (ERV). Someday we hope there will be a new controller that integrates to manage the air exchange automatically. Right now there isn’t even a simple time~based programmable controller. It’s a crime in today’s high tech world. But I guess there’s more money in social media content generation.