# Ring Sizer for Japan vs MapViewer

The clearest difference is in-app purchases: MapViewer at none against Ring Sizer for Japan's 1. MapViewer also leads on ads (none vs shown) and update cadence (every 6 weeks vs every 6 months). Ring Sizer for Japan's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.2). On price there is nothing between them.

Both are free to download. Ring Sizer for Japan sells 1 one-off in-app purchase. MapViewer asks for nothing beyond the download.

Ring Sizer for Japan ships an update every 6 months, MapViewer every 6 weeks. The most recent releases landed on October 26, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Ring Sizer for Japan | MapViewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Size | 4 MB | 1 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [mitsunori oishi](https://appshunter.io/developer/905649994) | [yoot](https://appshunter.io/developer/425128542) |

## What reviewers say

### Ring Sizer for Japan

[App page](https://appshunter.io/ios/app/ring-sizer-for-japan/id1090995858)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide Ads | $1.99 | one-time |


### MapViewer

[App page](https://appshunter.io/ios/app/mapviewer/id6749666924)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ring Sizer for Japan free?

Ring Sizer for Japan is free to download, with in-app purchases available.

### Is MapViewer free?

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

### Do Ring Sizer for Japan or MapViewer have ads?

Ring Sizer for Japan shows ads; MapViewer does not.

### Which is updated more often, Ring Sizer for Japan or MapViewer?

Ring Sizer for Japan ships an update every 6 months, and MapViewer every 6 weeks. Most recently, Ring Sizer for Japan was updated on October 26, 2026 and MapViewer on October 14, 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.*