[Cthulhu_]

It's kinda worrying you need an app / appliance to remember to open the window. Rule of thumb is to have the windows open at least 10 minutes a day, every day.

[jwpapi]

Sometimes I’m just too much in the zone working and I forget, leading to 10 mins more in the zone, but less overall focused work through the day.

[LorenPechtel]

You realize a lot of us live in places where that would be very expensive? Not to mention that the HVAC plants are usually not sized with that in mind.

[socksy]

Why is opening the window expensive? Climate control?

[willlma]

Yep, it's cold outside. So there's a CO2, energy, comfort (choose two) tradeoff.