Comparison

熱中症予報計 vs 週間天気予報 Sunny

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

熱中症予報計

Features
Read full description

気温と湿度の予測データから「暑さ指数」を算出。 熱中症の危険度を5段階で表示。同時に5つの市区町村を登録できます。 今後24時間の天気、気温、湿度、風向、風速の状況もわかります。 暑い季節を乗り切るために「熱中症予報計」を活用していただき、ご家庭や職場、学校、病院、お出かけ先など、さまざまなシーンでお役立てください。 現在の「暑さ指数」をお知りになりたい場合は、姉妹アプリ「熱中症警戒計」をご利用ください。

========================== アプリ起動後に「地点設定」ボタンをタップして表示させたい市区町村を登録してください。 「地点設定」画面では左上の+ボタンで登録が完了し、今後24時間の熱中症危険度や暑さ指数(WBGT)などが表示されます。 複数の地点を設定した場合は、左右へスワイプすると別の地点に切り替えられます。 表示される折れ線グラフは暑さ指数(WBGT)の値です。気温ではありませんので、ご注意ください。 「対策メモ」ボタンでは、独立行政法人・日本スポーツ振興センターが作成した「熱中症を予防しよう -知って防ごう熱中症-」の一部を収録していますので、熱中症予防対策の参考にしてください。画面をピンチ操作すると拡大表示できます。 「暑さ指数」ボタンでは、暑さ指数の求め方などを掲載しています。 「指数算出」ボタンでは、気温、湿度、時刻を設定して暑さ指数が求められます。室内などでの適切な気温、湿度管理の参考になります。 ========================== 日本生気象学会「日常生活における熱中症予防指針」と日本体育協会「熱中症予防のための運動指針」に基づき「WBGT値と気温、相対湿度との関係」を参考に、独自の計算式で「暑さ指数(WBGT)」を算出して、熱中症危険度をランク分けしています。 熱中症危険度は「危険・厳重警戒・警戒・注意・ほぼ安全」の5段階で表示します。 
※暑さ指数(WBGT)とは、暑熱環境による人が受ける熱ストレスの評価を行う指標としてISO7243・JIS Z8504で規定されています。 ※熱中症の危険度は環境条件によって大きく変化します。あくまでも目安としてお使いください。

About

週間天気予報 Sunny

This weather app displays daily essential weather and pollen forecasts on a single screen. It accurately captures weather changes using the latest data and is easy to use by setting your area via location information. It's ideal for quickly checking temperature and weather for your busy morning routine.

Highlights
  • Single-screen weather and pollen forecast
  • High visibility design
  • Detailed pollen dispersion status
  • Accurate weather change tracking
  • Location-based area setting
  • Quick temperature and weather checks
Features
Read full description

Condense the information you want to know onto one screen. "Weekly Weather Forecast Sunny" is a weather app that allows you to smartly check daily essential weather and pollen forecasts on a single screen. Based on the latest data, it accurately captures changes in weather. No complex operations are required; simply set your area using location information for easy use. [3 Points Why Sunny is Chosen] High visibility completed on one screen: We adopted a design that allows you to see the weekly weather, pollen information, and weather overview at a glance. There is no need to switch screens multiple times. You can quickly check the temperature and weather, making it perfect for your busy morning routine. Thorough hay fever countermeasure functions: For those who want to "check pollen first," you can display pollen information at the top of the settings. By selecting "details" from the list, you can view the pollen dispersion status in detail, supporting thorough daily pollen countermeasures. From choosing daily outfits to planning leisure activities where fishing weather is a concern, it provides weather information that can be widely utilized, from business travel. [Recommended for these people] Those who are concerned about pollen dispersal and want to take thorough measures before going out. Those who want a free weather forecast app that balances ease of use and information richness. Those who want to simply view specialized weather (whether) information. This is the definitive app for those who want to value both weather and pollen. Please take advantage of "Weekly Weather Forecast Sunny" to support your comfortable daily life!

Screenshots

熱中症予報計3 screens
週間天気予報 Sunny3 screens

Verdict

The call

The clearest difference is update cadence: 週間天気予報 Sunny at every 2 months against 熱中症予報計's every 5 months. On price, review sentiment, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

熱中症予報計 ships an update every 5 months, 週間天気予報 Sunny every 2 months. The most recent releases landed on September 16, 2026 and September 22, 2026 respectively.

Scorecard1 real difference · 9 level
熱中症予報計 versus 週間天気予報 Sunny: the parameters behind the verdict, then further details
Parameter熱中症予報計週間天気予報 Sunny
PriceFreeFree
Rating—3.0 (1 ratings) — better
Positive reviews35.0% of reviews — better33.3% of reviews
Number of ratings—1 — better
Update frequencyEvery 5 monthsEvery 2 months — better
AdsYesYes
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.6 — better16.0
Further details — not scored
Size7 MB56 MB
Age rating4+4+
DeveloperTakahiro IzakiNilCraft Inc.

Customer experience

熱中症予報計

Written reviews20 reviews
Positive35.0%
Neutral15.0%
Negative50.0%

週間天気予報 Sunny

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews9 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

In-app purchases

None

熱中症予報計

No in-app purchases

None

週間天気予報 Sunny

No in-app purchases

Questions

Is 熱中症予報計 free?
熱中症予報計 is free to download, with no in-app purchases.
Is 週間天気予報 Sunny free?
週間天気予報 Sunny is free to download, with no in-app purchases.
Do 熱中症予報計 or 週間天気予報 Sunny have ads?
Both 熱中症予報計 and 週間天気予報 Sunny show ads.
Which is updated more often, 熱中症予報計 or 週間天気予報 Sunny?
熱中症予報計 ships an update every 5 months, and 週間天気予報 Sunny every 2 months. Most recently, 熱中症予報計 was updated on September 16, 2026 and 週間天気予報 Sunny on September 22, 2026.

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