Predict
Timing, not guesswork
Forecast-driven crossings from your local hourly weather. Alerts land at the moment the timing changes, not on a fixed schedule.
Beta open now
Cool your home on timing, not AC.
Thresho reads your local hourly forecast, predicts when the outdoor temperature crosses your comfort thresholds, and tells you the right moment to open or close your windows. When the air outside is unhealthy, it holds the open-windows alerts automatically.
Join the beta
TestFlight beta
US only · iPhone · free beta · no account required
Get it on your iPhone
Try the beta on your iPhone.
Thresho is a free beta on TestFlight, for iPhones in the US. Cool your home on timing, not AC.
On a computer? Scan to open the beta on your iPhone.
Join the betaWhat Thresho does
Protect
Air-quality aware
When local AQI is unhealthy, Thresho holds the open-windows alerts so you are not invited to let bad air in.
Private
Yours alone
No account required, no ads, never sold. Thresho collects only anonymous usage to sharpen alert timing, never your location or rules, and you can turn it off anytime.