# 紫外線予報 UV vs PeakUV

The clearest difference is in-app purchases: PeakUV at none against 紫外線予報 UV's 4. PeakUV also leads on ads (none vs shown) and device support (4 vs 2). On price, update cadence and iOS requirement there is nothing between them.

Both are free to download. 紫外線予報 UV sells 4 one-off in-app purchases. PeakUV asks for nothing beyond the download.

紫外線予報 UV ships an update every 6 weeks, PeakUV monthly. The most recent releases landed on October 11, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | 紫外線予報 UV | PeakUV |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uv/id1529084441/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 68 MB | 64 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [hidehiko aihara](https://appshunter.io/developer/1178520609) | [Happy Figs](https://appshunter.io/developer/1716550150) |

## What reviewers say

### 紫外線予報 UV

[App page](https://appshunter.io/ios/app/uv/id1529084441)

This app provides hourly UV index forecasts and analysis maps, making it easy to check UV radiation levels. It offers current location UV information, daily UV data, and quick access to national weather conditions.

**Highlights:** Hourly UV index forecasts, Analysis maps, Current location UV info, Daily UV data, National weather conditions

**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 |


### PeakUV

[App page](https://appshunter.io/ios/app/peakuv/id6775639946)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is 紫外線予報 UV free?

紫外線予報 UV is free to download, with in-app purchases available.

### Is PeakUV free?

PeakUV is free to download, with no in-app purchases.

### Do 紫外線予報 UV or PeakUV have ads?

紫外線予報 UV shows ads; PeakUV does not.

### Which is updated more often, 紫外線予報 UV or PeakUV?

紫外線予報 UV ships an update every 6 weeks, and PeakUV monthly. Most recently, 紫外線予報 UV was updated on October 11, 2026 and PeakUV on October 21, 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.*