HeatLine: Heat Index
Wet bulb heat index for crews
About
Provides real-time heat index readings for your exact location, differentiating between shade and direct sun. Features an offline wet-bulb estimate and a manual calculator for temperature and humidity inputs. Includes a per-shift log for tracking and exporting data.
What's New in HeatLine
1.0
July 30, 2026
Developer apps
FAQ
What is the heat index?
The heat index is a measure of how hot it feels when relative humidity is factored in with the actual air temperature. HeatLine provides both shade and sun-adjusted values for your location.
Does HeatLine work offline?
Yes, HeatLine offers an on-device wet-bulb estimate and a manual calculator that function fully offline. You can input temperature and humidity from any thermometer to get instant results.
Can I track my work shifts with HeatLine?
Yes, HeatLine includes a per-shift log that you can keep, export, and hand off. This allows you to maintain records of readings and conditions over your work period.
How does HeatLine alert me to dangerous heat?
HeatLine provides a single haptic alert the moment you cross a pre-set heat threshold. This provides an immediate, tactile notification of potentially dangerous conditions.
Is HeatLine a medical app?
No, HeatLine provides general weather and safety information for outdoor work. It is not medical advice or a workplace heat-stress assessment; decisions about working and resting remain with you and your employer.
Does HeatLine have ads?
No, HeatLine does not contain advertisements. The app is free to download and use, with optional in-app purchases.
What devices does HeatLine support?
HeatLine is available for iPhone and iPad devices. It is designed to provide essential weather safety information on the go.
How often is HeatLine updated?
HeatLine was last updated on July 30, 2026, with version 1.0. Future updates will likely focus on improving features and reliability based on user feedback.
