245+ iOS apps curated and reviewed
Out of 245+ heat index calculator pro apps on iOS, 18 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.7★ (75) | Yes | Yes | Oct 2026 | |
| 2 |  | Free | 4.4★ (26) | No | No | Oct 2026 | |
| 3 |  | Free | 4.0★ (1) | Yes | Yes | May 2026 | |
| 4 |  | Free | 5.0★ (1) | No | No | Nov 2026 | |
| 5 |  | $2.99 | 5.0★ (2) | No | No | Oct 2026 | |
| 6 |  | Free | 2.6★ (316) | No | No | Oct 2026 | |
| 7 |  | Free | 4.7★ (61K) | No | No | Nov 2026 | |
| 8 |  | Free | — | No | Yes | Oct 2026 |
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.
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.
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.
