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 | 4.0★ (1) | Yes | Yes | May 2026 | |
| 2 |  | Free | 2.6★ (314) | No | No | Sep 2026 | |
| 3 |  | Free | 4.4★ (19) | No | No | Aug 2026 | |
| 4 |  | Free | 4.7★ (69) | Yes | Yes | Sep 2026 | |
| 5 |  | Free | — | Yes | Yes | Aug 2026 | |
| 6 |  | Free | 4.6★ (2.5K) | Yes | Yes | Sep 2026 | |
| 7 |  | Free | — | Yes | Yes | Aug 2026 | |
| 8 |  | Free | — | No | No | May 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 helps outdoor workers stay safe by providing real-time heat index information and hourly forecasts specific to their location. It offers occupational safety recommendations and details on heat-related illnesses and their first aid.
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.
