---
title: "Heat Index - HI — App Overview"
url: https://marlvel.ai/apps/heat-index-hi
category: Weather
developer: LionsApp di Nallbati Elton
platforms: ios
rating: 3.8 (8 ratings)
pricing: paid
report_level: overview
generated: 2026-04-21
last_verified: "2026-04-21T19:24:44.403Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** This is a specialized utility focused on providing a standardized, NWS-referenced calculation for heat index values.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Weather |
| Rating | 3.8 ★ (8) |
| Pricing | paid |
| Platforms | iOS |
| Latest Version (iOS) | 1.2 |
| Developer | LionsApp di Nallbati Elton |

<!-- SECTION: Summary -->
## What is Heat Index - HI?

Heat Index - HI is a weather utility that calculates the 'feels like' temperature by combining air temperature and relative humidity. The app distinguishes itself by utilizing the Lans P. Rothfusz regression analysis equation, as described in the 1990 National Weather Service Technical Attachment SR 90-23.

<!-- SECTION: Key Features -->
## Key Features

- **Rothfusz Equation Calculation**: Computes the heat index using the specific multiple regression analysis developed by Lans P. Rothfusz.
- **Apparent Temperature Metrics**: Provides a 'feels like' temperature value that accounts for the impact of relative humidity on perceived heat.

<!-- SECTION: Target Audience -->
## Who is it for?

Individuals seeking precise, scientifically-backed calculations for apparent temperature based on environmental conditions.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/heat-index-hi/id1480149233?uo=4)
- [Full Intelligence Report](https://marlvel.ai/apps/heat-index-hi)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/apps/heat-index-hi).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*