248+ iOS apps curated and reviewed
Looking for free heat index calculator apps? 20 of our 248+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.4★ (26) | No | No | Oct 2026 | |
| 2 |  | Free | 4.7★ (75) | Yes | Yes | Oct 2026 | |
| 3 |  | Free | 4.0★ (1) | Yes | Yes | May 2026 | |
| 4 |  | Free | 2.6★ (316) | No | No | Oct 2026 | |
| 5 |  | Free | 4.6★ (2.8K) | Yes | Yes | Nov 2026 | |
| 6 |  | Free | 5.0★ (1) | No | No | Nov 2026 | |
| 7 |  | Free | — | — | No | Oct 2026 | |
| 8 |  | Free | — | No | Yes | Sep 2026 |
This tool calculates the heat index based on temperature and humidity, providing OSHA-calibrated risk levels and protective recommendations for outdoor work. It also includes a reference guide for heat-related illnesses and first aid.
Instantly determine how hot it truly feels by combining temperature and humidity. This app provides real-time weather data, forecasts, and heat risk warnings to help you plan outdoor activities safely and avoid heat-related illnesses.
Calculate the heat index by simply inputting air temperature and relative humidity. Supports multiple temperature units including Kelvin, Celsius, and Fahrenheit. Results are for reference only.
