247+ iOS apps curated and reviewed
Looking for free heat index calculator apps? 18 of our 247+ 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 | 4.0★ (1) | Yes | Yes | May 2026 | |
| 2 |  | Free | 4.4★ (26) | No | No | Oct 2026 | |
| 3 |  | Free | 4.7★ (69) | Yes | Yes | Oct 2026 | |
| 4 |  | Free | 2.6★ (314) | No | No | Sep 2026 | |
| 5 |  | Free | 4.6★ (2.8K) | Yes | Yes | Oct 2026 | |
| 6 |  | Free | — | No | No | Oct 2026 | |
| 7 |  | Free | — | No | No | May 2026 | |
| 8 |  | Free | — | No | Yes | Sep 2026 |
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.
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.
