# Heat Index: NIOSH Calculator — Heat Safety & Risk Level Tool > Heat safety calculator based on OSHA and NIOSH guidelines for outdoor work. (iPhone/iPad app by Svitlana Kyrylova.) - Source: https://appshunter.io/ios/app/heat-index-niosh-calculator/id6760123940 (this page in markdown: same URL + `.md`) - Developer: [Svitlana Kyrylova](https://appshunter.io/developer/1470847807) - Category: Weather, Health & Fitness - Price: Free - Rating: 4.40/5 from 19 App Store ratings - Age rating: 4+ - Requires: iOS 18.4 · 2 MB - Languages: American English - Released: 2026-03-10 - Data updated: 2026-08-25 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/heat-index-niosh-calculator/id6760123940/reviews.md ## What is Heat Index? Heat Index: NIOSH Calculator The trusted heat safety calculator for outdoor workers, safety officers, and site supervisors — built on OSHA and NIOSH guidelines to assess heat risk on any job site. Know your heat risk before it becomes a heat emergency. Enter temperature and humidity, get an instant heat index reading with OSHA-calibrated risk levels and protective recommendations. Instant Heat Index Calculator Calculate the heat index from any temperature and humidity combination. Based on NIOSH and OSHA standards — the same science used by safety professionals across construction, agriculture, landscaping, and outdoor industries. OSHA Risk Level Assessment Get immediate risk classification (Lower, Moderate, High, Very High, Extreme) with specific protective measures for each level. Know exactly when to schedule breaks, enforce hydration, or halt outdoor work. Heat Illness Reference Guide Comprehensive on-the-spot reference for heat-related illness signs, symptoms, and first aid — covering heat stroke, heat exhaustion, heat cramps, heat rash, and rhabdomyolysis. Designed for Safety Professionals - OSHA & NIOSH heat index guidelines built in - Manual temperature and humidity input for any location - Heat stress risk calculator with color-coded danger levels - First aid protocols for all heat-related illnesses - WBGT and wet bulb temperature reference - Works for construction, agriculture, landscaping, utilities, and more - Who Uses This App? - OSHA-trained safety officers and EHS managers - Construction site supervisors and foremen - Agricultural and farm labor supervisors - Landscaping, roofing, and utility crews - Any outdoor worker exposed to heat risk ## Key features - Instant heat index calculation - OSHA risk level assessment - Protective measure recommendations - Heat illness reference guide - First aid protocols - Based on OSHA and NIOSH standards ## Frequently asked questions about Heat Index ### What is the Heat Index app? The Heat Index app is a tool designed to calculate heat safety risks for outdoor workers. It uses temperature and humidity data to provide OSHA-calibrated risk levels and recommends protective measures. ### How does the Heat Index app determine risk levels? The app calculates the heat index based on temperature and humidity, then classifies the risk into levels like Lower, Moderate, High, Very High, and Extreme, following NIOSH and OSHA guidelines. ### Does the Heat Index app offer first aid information? Yes, the app includes a comprehensive reference guide for heat-related illnesses, detailing signs, symptoms, and first aid protocols for conditions such as heat stroke and heat exhaustion. ### What industries is the Heat Index app useful for? This app is particularly useful for industries with outdoor workforces, including construction, agriculture, landscaping, utilities, and any sector where workers are exposed to heat risk. ### Is the Heat Index app free to use? Yes, the Heat Index app is available for free, with no in-app purchases or advertisements, making it accessible for all users concerned with heat safety. ### What devices support the Heat Index app? The Heat Index app is designed for use on iPhones and iPads, ensuring accessibility for a wide range of Apple device users. ### How often is the Heat Index app updated? The app was last updated on August 1, 2026, with version 1.104.1, indicating ongoing support and potential for future improvements. ### What is the age rating for the Heat Index app? The Heat Index app has an age rating of 4+, making it suitable for users of all ages who need to understand heat safety information. ## Version history (last 5 releases) ### 1.104.1 — 2026-08-01 - ui improvements - bug fixes ### 1.104 — 2026-04-15 - ui improvements - bug fixes ### 1.103 — 2026-04-03 - ui improvements ### 1.102 — 2026-03-10 - ui improvements - bug fixes ### 1.101 — 2026-03-10 No release notes. ## Apps similar to Heat Index | App | Rating | Price | Category | | --- | --- | --- | --- | | [FeelTemp](https://appshunter.io/ios/app/feeltemp/id6746193975) | 5.0 (2) | Free | Weather | | [Heat Safety Pro](https://appshunter.io/ios/app/heat-safety-pro/id6753221121) | — | Free | Weather | | [Heat Index Calculator Pro](https://appshunter.io/ios/app/heat-index-calculator-pro/id6476157163) | 4.7 (69) | Free | Weather | | [HeatAlert: Heat Stress Index](https://appshunter.io/ios/app/heatalert-heat-stress-index/id6475117114) | 3.6 (11) | Free | Weather | | [Wind Chill & Humid Calculators](https://appshunter.io/ios/app/wind-chill-and-humid-calculators/id6475280697) | 4.2 (25) | Free | Weather | | [Heats: Heat Index & UV](https://appshunter.io/ios/app/heats-heat-index-and-uv/id6749148814) | 5.0 (10) | Free | Weather | ## More apps by Svitlana Kyrylova - [TScan Inventory Asset Tracking](https://appshunter.io/ios/app/tscan-inventory-asset-tracking/id1308091025) - [Inspection & Checklist - QAQC](https://appshunter.io/ios/app/inspection-and-checklist-qaqc/id1326949967) - [Hours Tracker: Track Job Hours](https://appshunter.io/ios/app/hours-tracker-track-job-hours/id1438319478) - [ExpenseBook - Expense Reports](https://appshunter.io/ios/app/expensebook-expense-reports/id1473587313) - [ICSC - Chemical Safety Cards](https://appshunter.io/ios/app/icsc-chemical-safety-cards/id1509429471) - [Site Audit - Punch, Snag Lists](https://appshunter.io/ios/app/site-audit-punch-snag-lists/id1530801554) All apps by Svitlana Kyrylova: https://appshunter.io/developer/1470847807 ## Related topics [niosh heat stress](https://appshunter.io/ios/topics/niosh-heat-stress) · [heat index](https://appshunter.io/ios/topics/heat-index) · [osha heat index](https://appshunter.io/ios/topics/osha-heat-index) · [osha heat safety tool](https://appshunter.io/ios/topics/osha-heat-safety-tool) · [niosh tool](https://appshunter.io/ios/topics/niosh-tool) · [osha niosh heat](https://appshunter.io/ios/topics/osha-niosh-heat) · [osha niosh heat index](https://appshunter.io/ios/topics/osha-niosh-heat-index) · [heat index calculator](https://appshunter.io/ios/topics/heat-index-calculator) · [heat index tool](https://appshunter.io/ios/topics/heat-index-tool) · [niosh heat index](https://appshunter.io/ios/topics/niosh-heat-index) · [osha heat safety](https://appshunter.io/ios/topics/osha-heat-safety) · [osha niosh heat safety](https://appshunter.io/ios/topics/osha-niosh-heat-safety) · [heat safety pro](https://appshunter.io/ios/topics/heat-safety-pro) · [niosh heat](https://appshunter.io/ios/topics/niosh-heat) · [osha-niosh heat safety tool](https://appshunter.io/ios/topics/osha-niosh-heat-safety-tool) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*