# 月読君 vs 天気図Viewer

The clearest difference is update cadence: 天気図Viewer at every 5 weeks against 月読君's every 4 months. 天気図Viewer also leads on review sentiment (75% vs 60%). 月読君's advantage is iOS requirement (16.6 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

月読君 costs $1.99 and 天気図Viewer $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

月読君 ships an update every 4 months, 天気図Viewer every 5 weeks. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | 月読君 | 天気図Viewer |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Positive reviews | 60.0% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | — | Paid |
| Size | 26 MB | 2 MB |
| Requires iOS | **16.6** | 18.0 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [sorakaze Inc.](https://appshunter.io/developer/1046448101) | [Sakae Ichikawa](https://appshunter.io/developer/1548442585) |

## What reviewers say

### 月読君

[App page](https://appshunter.io/ios/app/id366975354)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### 天気図Viewer

[App page](https://appshunter.io/ios/app/viewer/id1566088405)

Access real-time and forecast weather maps directly from the Japan Meteorological Agency. View various charts, including surface, high-altitude, and numerical forecast maps, with options for printing and zooming. Download maps for offline viewing.

**Highlights:** Access real-time weather maps, View numerical forecast maps, High-altitude weather charts, Print weather maps, Zoom and full-screen display, Download maps for offline use, Wind profiler with GPS integration

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

**In-app purchases:** none


## Frequently asked questions

### Is 月読君 free?

月読君 costs $1.99, with no in-app purchases.

### Is 天気図Viewer free?

天気図Viewer costs $1.99, with no in-app purchases.

### Do 月読君 or 天気図Viewer have ads?

Neither 月読君 nor 天気図Viewer shows ads.

### Which is updated more often, 月読君 or 天気図Viewer?

月読君 ships an update every 4 months, and 天気図Viewer every 5 weeks. Most recently, 月読君 was updated on September 23, 2026 and 天気図Viewer on September 22, 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.*