熱中症ナビ vs UVready
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
熱中症ナビ
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暑い夏に注意したい「熱中症」。 熱中症は、高温環境下で体内の水分や塩分(ナトリウムなど)のバランスが崩れたり、体内の調整機能が成り立たなくなることで発症する障害の総称です。 死に至る可能性のある病態ですが、予防法を知っていれば未然に防ぐことができます。 【熱中症ナビ】では、そんな熱中症対策に必要な毎日の熱中症危険度を知らせてくれたり、熱中症の基礎知識や予防法の紹介など、暑い夏を乗り切るための様々な便利機能が備わったiPhone用アプリです。 真夏の炎天下で行われる野外音楽イベントや海水浴、BBQ(バーベキュー)、スポーツ観戦などを思う存分楽しむためにはUV(紫外線)対策と同時に熱中症対策がとても重要です。 「だけど熱中症対策ってどうすればいいの?」 そんな時、この【熱中症ナビ】が大活躍! まずは【熱中症ナビ】で熱中症の基礎知識、予防法、対処法を知りましょう。そしてお出かけ前には熱中症危険度をチェック! かわいいイラストとともに危険度を5段階で表示します。 危険度が高い日は、帽子を被るなど服装に注意し、水分と塩分をこまめに補給できるようにしましょう。 これで準備万端! 【熱中症ナビ】をインストールしたスマートフォンと一緒におもいっきり夏の思い出を作りましょう! <主な機能> 1.毎日の熱中症警戒指数を表示! ⇒3カ所まで登録できる観測地域を設定しておけば、12時間の危険度予報が表示されます。 ⇒現在地での実況値や予報もすぐに調べることができます。 2.熱中症に関する基礎知識 ⇒基礎知識や基本的な予防方法を解説。また、熱中症が疑われる場合の対処法など、いつでもチェック。 3.4コママンガを連載 ⇒休憩時間に熱中症対策ついでに、ちょっとした時間つぶしにどうぞ 4.警戒指数観測地点は昨年度版の142カ所を大幅に改訂した、全国840箇所。3カ所まで登録可能。 ⇒出張先や旅行先も登録しておけて便利です。 5.プロモード搭載 ⇒身体作業強度、作業環境、衣類による補正に対応。現場での熱中症対策にお役立てください。
UVready
Get instant UV index readings with a single tap. Understand current and hourly UV levels, receive personalized safe sun exposure times based on your skin type, and get alerts for changes. It's a quick and simple way to protect your skin year-round.
- Instant UV index check
- Hourly UV forecast
- Personalized safe exposure time
- Intuitive emoji guidance
- UV level change alerts
- Instant sharing of UV conditions
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One tap. One second. Done. Instantly see how strong the UV is right now. UV rays reach your skin on cloudy days and even in winter. UV radiation is the leading cause of skin aging — it's a year-round concern. But opening a weather app, scrolling through screens, hunting for the UV section? Too much hassle. This app is different. Open it, and you're done. Key Features · Instant Check — The moment you open the app, your current UV index appears. No loading. No scrolling. · Hourly Forecast — See how UV levels change throughout the day at a glance. Plan your outdoor time smarter. · Intuitive Guidance — Not just numbers. Emoji indicators and clear level descriptions help anyone understand UV conditions instantly. · Personalized Safe Exposure Time — Select your skin type (Fitzpatrick scale) and instantly see how many minutes you can safely stay in the sun without sunscreen at the current UV level. Because everyone's skin is different. · Instant Share — Share a summary image of the current UV conditions with friends and family in one tap. · UV Level Change Alerts — Get a push notification the moment UV levels change. Protect your skin before it's too late. WHO UV Index Guidelines: The UV Index was developed by the World Health Organization (WHO), the World Meteorological Organization, and other international bodies as a global standard for UV reporting. Here's what each level means: · 0–2 (Low) — Minimal risk. You can safely enjoy the outdoors. · 3–5 (Moderate) — Seek shade at midday. Wear sunglasses, a hat, and apply SPF 30+ sunscreen. · 6–7 (High) — Reduce sun exposure between 10 a.m. and 4 p.m. Sunscreen and protective clothing are essential. · 8–10 (Very High) — Take extra precautions. Fair-skinned individuals may burn in under 10 minutes. · 11+ (Extreme) — Avoid outdoor exposure if possible. Unprotected fair skin can burn in less than 5 minutes. Note: These recommendations are based on lightly tanned skin (Fitzpatrick Type II). If you have lighter skin, children, or are on photosensitizing medication, take extra care. Those with darker skin tones may tolerate more exposure, but UV damage is cumulative for everyone. Perfect For · Anyone who wants a fast UV check before heading out · People who care about skin protection and sunscreen timing · Those who want just the essential info without a complex weather app · Runners, hikers, commuters — anyone active under the sun UV check — one second is all it takes.
Screenshots
Verdict
The clearest difference is ads: 熱中症ナビ at none against UVready's shown. 熱中症ナビ also leads on iOS requirement (5.1.1 vs 16.0). UVready's advantage is review sentiment (100% vs 78%) and update cadence (fortnightly vs every 6 weeks). On price, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
熱中症ナビ ships an update every 6 weeks, UVready fortnightly. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.
| Parameter | 熱中症ナビ | UVready |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 77.8% of reviews | 100.0% of reviews — better |
| Update frequency | Every 6 weeks | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 5.1.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 31 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Saraya Co.,Ltd. | Appetizer |
Customer experience
熱中症ナビ
UVready
In-app purchases
熱中症ナビ
No in-app purchases
UVready
No in-app purchases









