Connecting your smartphone and Aranet4 device via Bluetooth, a handy Aranet4 app allows you to remotely view current and historical measurement data and adjust the configuration of the device.

Aranet4 is a simple, easy to use, battery powered CO2 monitoring device. It displays on its screen the current value of CO2 concentration, as well as the temperature, relative humidity and atmospheric pressure. The three colors on the screen indicate when the CO2 limits exceed norms and action to increase the air circulation must be taken.

• Real time measurement data overview;
• 7 day historical data;
• Configuration of the device;
• Listing of all Aranet4 devices;
• CO2 calibration;
• Firmware upgrades;

What’s New

Version 2.0.6

Option "Share data" added

Ratings and Reviews

3.4 out of 5
7 Ratings

7 Ratings

zero-below ,

Pretty basic app

The Aranet4 co2 meters are physically well made, but this app is extremely basic and doesn’t function well.

1) it takes a long time to connect to the devices, and sometimes it seems like I need to open+close the app a few times or turn off Bluetooth and back on, for it to actually see adjacent devices.

2) the app doesn’t save any history of the data it fetched from devices. So, to view any data, it first needs to connect to the device (see above...flaky and unreliable), then it needs to fetch all the device history, then you can see a graph of the data. Every time the app closes and opens, this process needs to repeat.

I also have several temp/humidity/pressure sensors from SensorPush — their app is infinitely better than this, it reliably connects to the sensors, stores historical data even when not connected to the sensor, and it can show graphs of current data while still fetching the history. Unfortunately, SensorPush doesn’t make co2 meters, so I’m stuck with this not-even-half-baked app for that reason.

Castonge ,

Bluetooth fixed!

Pin entry works with iOS 14.4

ScienceBased ,


Downloading CSV files appears to be taken away in the updated app. This capability was one of the main reason we bought 10 of these monitors. It’s critical to how we’ve been monitoring school classrooms. Get it back into the app ASAP.

App Privacy

The developer, SAF Tehnika AS, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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