# 熱中症アラート vs 雷雲

The clearest difference is in-app purchases: 熱中症アラート at none against 雷雲's 4. 熱中症アラート also leads on ads (none vs shown) and iOS requirement (7.0 vs 15.6). 雷雲's advantage is update cadence (every 2 months vs every 12 months) and review sentiment (67% vs 57%). On price and device support there is nothing between them.

Both are free to download. 雷雲 sells 4 one-off in-app purchases. 熱中症アラート asks for nothing beyond the download.

熱中症アラート ships an update every 12 months, 雷雲 every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 熱中症アラート | 雷雲 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 57.1% of reviews | **66.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 63 MB |
| Requires iOS | **7.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [日本気象株式会社](https://appshunter.io/developer/517668176) | [hidehiko aihara](https://appshunter.io/developer/1178520609) |

## What reviewers say

### 熱中症アラート

[App page](https://appshunter.io/ios/app/id836424089)

This app provides real-time heatstroke risk levels based on the heatstroke index. It offers notifications and advice from a weather mascot, with customizable settings for regions and alert thresholds. Data is updated every 10 minutes.

**Highlights:** Real-time heatstroke risk levels, Customizable notifications, Heatstroke index graph, Weather mascot advice, Region-specific settings, 10-minute data updates

**Features:** Vision Pro support

**In-app purchases:** none


### 雷雲

[App page](https://appshunter.io/ios/app/id1577287549)

Get real-time lightning and cloud information for the next hour, with movement visualized on a map. Easily check weather forecasts, precipitation, temperature, and more for your current location and nationwide.

**Highlights:** Real-time lightning cloud information, 1-hour lightning forecast, Lightning cloud movement map, Nationwide weather alerts, Daily and weekly weather forecasts, Precipitation and temperature data

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee (Regular) | $0.49 | one-time |
| 開発者応援募金 | $1.99 | one-time |
| Coffee (Large) | $1.99 | one-time |
| Cake Set | $5.99 | one-time |


## Frequently asked questions

### Is 熱中症アラート free?

熱中症アラート is free to download, with no in-app purchases.

### Is 雷雲 free?

雷雲 is free to download, with in-app purchases available.

### Do 熱中症アラート or 雷雲 have ads?

雷雲 shows ads; 熱中症アラート does not.

### Which is updated more often, 熱中症アラート or 雷雲?

熱中症アラート ships an update every 12 months, and 雷雲 every 2 months. Most recently, 熱中症アラート was updated on November 1, 2026 and 雷雲 on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*