# Heatstroke WBGT

> Measures outdoor heatstroke index (WBGT) and provides prevention advice. (iPhone/iPad app by yoshihito sakagami.)

- Source: https://appshunter.io/ios/app/heatstroke-wbgt/id1229074767 (this page in markdown: same URL + `.md`)
- Developer: [yoshihito sakagami](https://appshunter.io/developer/1112518506)
- Category: Weather, Health & Fitness
- Price: Free
- Rating: 2.50/5 from 2 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 29 MB
- Languages: American English, Japanese, Chinese (Traditional, Taiwan)
- Released: 2017-04-24
- Data updated: 2026-08-20
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/heatstroke-wbgt/id1229074767/reviews.md

## What is Heatstroke WBGT?

***The word that suits this Heatstroke Preventive App is "Simple is Best"!***

This is app that measures the outdoor WBGT (heatstroke index) in current location, and teaches the heatstroke alert level and the heatstroke countermeasure method to you.
The app uses GPS function, and just tap the "START!" button and this app will measure and notify you of the outdoor WBGT(heatstroke Index) in current location.
The app displays Celsius temperature (°C) and Fahrenheit temperature (°F) at the same time, so it can be used anywhere in the world, and It corresponds to 3 languages of English and Traditional Chinese (Taiwan / Hong Kong) and Japanese.
By the way, the alert levels of heat stroke of the app are based on "熱中症予防情報サイト(Heatstroke prevention information site)"  of Japan's Environmental Protection Agency.

This app is using the OpenWeatherMap(CC BY-SA4.0).

- Disclaimer 1. 
We are making as much as possible precise calculation result is output, but there are cases where errors due to technical problems, such as floating point results.

- Disclaimer 2. 
We are not liable for any damage caused by the use of this application does not bear all of the responsibility.

## Key features

- Measures outdoor WBGT (heatstroke index)
- Provides heatstroke alert levels
- Offers heatstroke countermeasure methods
- Uses GPS for current location
- Displays Celsius and Fahrenheit
- Supports English, Traditional Chinese, and Japanese

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/heatstroke-wbgt/id1229074767/reviews.md

### 5/5 — I need no-ad

*2025-07-05*

I need no-ad

### 1/5 — Doesn’t use WBGT

*2021-07-29*

The app only uses temperature.  They mislabeled the app by implying it provides WBGT

**Developer response:** Dear HuaDe314159.

Thank you very much for your review.
First of all, this application does not display only the temperature as you have pointed out.
If the relative humidity outdoors is high, the WBGT value and the outdoor temperature may be close, but even in such a case, the value is the WBGT value which has been calculated through a legitimate process in the app.
The app estimates the Globe thermometer temperature (Tg) from the outdoor temperature and calculates the wet bulb temperature from the temperature and relative humidity to calculate and display the WBGT value.
Therefore, the WBGT value may be different from the actual measurement.
The Globe thermometer temperature (Tg) is estimated using the following formula, as there is a strong correlation between the dry bulb temperature (Td) and the Globe thermometer temperature (Tg).

- Calculation formula: Tg = 1.45 Td - 27.162 [Temperature unit: ℉]
[Statistical information on this correlation : The number of samples is 17376 and the coefficient of determination(R^2) when statistics are taken is 0.919]

If you have any questions, please do not hesitate to contact us.

### 5/5 — simple is best.

*2020-06-23*

すぐに分かって便利。

**Developer response:** ダウンロードして頂いてありがとうございます！
もし、このアプリについて要望がありましたら、ツイッターの方で承りますので、遠慮なくお願いします！

### 1/5 — すぐ落ちる

*2017-05-31*

タップしてもすぐ落ちます。使えません

**Developer response:** newone32031様

　ご不便とご迷惑をお掛けした事を先に謝罪致します。
　ご報告頂き有り難うございます。
　対策を施した最新バージョン(1.0.2)を本日(6月5日)、アップル社に申請した所です。
　近日中にはApp Store/iTunes Storeで公開されるはずです。
　もし、本アプリをnewone32031様がまだ削除していなければ、GPSの感度が良く(※出来れば鉄筋コンクリートの建物以外の場所が望ましいです)電波の入りが良い所でアプリを再起動(※アプリのタスクを完全に停止した後に、アプリを再び動かすと言う意味です)して頂ければ、応急処置にはなりますが、これでアプリがクラッシュせず(落ちず)に動くはずです。
　重ねてご不便とご迷惑をお掛けした事を謝罪致します。

〜アプリ開発者より〜

## Frequently asked questions about Heatstroke WBGT

### What is the WBGT measured by Heatstroke WBGT?

The app measures the outdoor WBGT (Wet-Bulb Globe Temperature), which is a measure of the heat stress in direct sunlight, taking into account temperature, humidity, wind speed, and solar radiation. This index is used to determine the risk of heatstroke.

### How accurate is Heatstroke WBGT?

The app aims for precise calculation results, but acknowledges potential errors due to technical problems. The alert levels are based on guidelines from Japan's Environmental Protection Agency's 'Heatstroke Prevention Information Site'.

### Does Heatstroke WBGT have ads?

Yes, this application contains advertisements. As it is a free app with ads, users will encounter advertisements while using its features.

### What languages does Heatstroke WBGT support?

Heatstroke WBGT supports three languages: English, Traditional Chinese (Taiwan/Hong Kong), and Japanese. This allows users from different regions to understand the heatstroke information provided.

### On which devices can I use Heatstroke WBGT?

Heatstroke WBGT is available for iPhone and iPod devices. It is designed for iOS users who need to monitor heatstroke risks.

### How often is Heatstroke WBGT updated?

The latest version of Heatstroke WBGT is 1.0.5, and it was last updated on October 4, 2023. This indicates a recent update, suggesting ongoing maintenance and potential improvements.

### What is the age rating for Heatstroke WBGT?

Heatstroke WBGT has an age rating of 4+. This means it is considered suitable for children aged 4 and above, with no mature content.

### Is Heatstroke WBGT free to download?

Yes, Heatstroke WBGT is available for free download. Users can access its heatstroke monitoring features without any upfront cost.

## Version history (last 5 releases)

### 1.0.5 — 2023-10-04

- iOS11 or later is now supported.
- New privacy standards (IDFA and ATT) adopted from iOS14 are now supported.
- iPhone with a display larger than 6 inches is now supported.

### 1.0.4 — 2020-01-12

- Support for since iOS9.0.
- The app's some specifications(support URL, marketing URL, etc.) have been changed.

### 1.0.3 — 2017-12-30

- Bug fixes.
There was a bug where the application malfunction when acquisition of location information failed, so we corrected it.

### 1.0.2 — 2017-06-05

- Fix bug in when trying to acquire weather information when radio condition is bad, the application crashes.

### 1.0.1 — 2017-05-10

- Minor changes were made.

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All apps by yoshihito sakagami: https://appshunter.io/developer/1112518506

## Related topics

[heatsafe wbgt](https://appshunter.io/ios/topics/heatsafe-wbgt)

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*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 2026-08-20.*