Do I need WiFi and an app, or is an on-device display enough?

WiFi-connected models with apps let you log trends over time, get alerts and view data remotely, which reviewers value for tracking CO2 buildup or seasonal radon swings. Battery-powered, app-based Airthings units are popular for radon trend logging, while simpler display-only or Alexa-linked units suit shoppers who just want a real-time readout. Choose based on whether you want historical data or just a snapshot.