Ring Sizer for Japan vs MapViewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ring Sizer for Japan
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This app is an app for measuring the size of the jewelry ring of Japan. (This is not an app that automatically measures ring size or finger size.) Units of jewelry ring size of Japan is pronounced "gou". If you came to Japan, please try to use, such as in the case of considering the ring. ※ Warning: - The accuracy of the scales cannot be guaranteed. - Calibration and PPI values will be reset when the model changes. - Set the PPI value only when the model is undecided. - When you change the PPI value, perform calibration after the change. How to use ■Ring tab 1. Select the size of the ring. 2. Display the ring inside diameter and inside circumference of the length in units mm and inches. 3. View the circle of the inside diameter of the ring. 4. View the inside circumference of the length of the ring in a bar graph. - If you want to see your ring size in Japan. Make sure that the inside diameter of the your ring is equal to the circular to be displayed on the screen. Or circular screen Make sure the slightly larger size. - If you want to know your ring size from the circumference of your finger. Wrap the paper around the finger. To see its length. Make sure that the length of the paper is equal to length of the bar graph to be displayed on the screen. Or the screen of the bar graph, make sure a little long length. ■ Rings tab -Displays a list of circles (inner diameter of the ring) within the displayable range. ■ Bar tab -Displays a list of bar graphs (inner circumference length of the ring) within the displayable range. ■ list -Displays a list of ring numbers, inner diameters, and inner circumferences. ■ Settings tab - Calibration - PPI (pixels per inch) setting - In-app purchase (ads not displayed) - In-app purchase restoration ■ Calibration Adjust the length of the ruler. Use the correct ruler for adjustment. "Calibration" button: Records the adjusted state and reflects the calibration result on the ruler. "Reset" button: Returns the adjustment status to the specified value. It will not be recorded. "Initialize" button: Returns the adjustment status to the specified value and reflects it on the ruler. * Caution: The calibration value will be reset when the model changes. ■ PPI (pixels per inch) setting If the model is undecided, check the PPI value of the model before setting the PPI value. * Please set only when the model is undecided. "OK" button: Record the entered PPI value and reflect it on the ruler display. "Initialize" button: Returns the PPI value to the specified value and reflects it on the ruler. * Caution: The PPI value will be reset when the model changes. Conforms to the Japanese Industrial Standards (JIS S 4700:1998 table2). ※:Use this application at your own risk.
MapViewer
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このアプリは、記録した地点間の移動時間(時系列昇順)、地点間の移動距離(時系列昇順)、総移動時間、総移動距離を計算するものです。[MAP]ボタンを押した時に、時系列に従って地図上に移動記録を表示します。その際、道なりに線を引くのではなく、緯度と経度で特定される点と点を直線で繋ぎます。ピンが緯度・経度に応じて表示されます。
Screenshots
Verdict
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.
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. 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.
| Parameter | Ring Sizer for Japan | MapViewer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 months | Every 6 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 18.2 |
| Further details — not scored | ||
| Size | 4 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | mitsunori oishi | yoot |
In-app purchases
Ring Sizer for Japan
- Hide Ads$1.99
MapViewer
No in-app purchases
Questions
Is Ring Sizer for Japan free?
Is MapViewer free?
Do Ring Sizer for Japan or MapViewer have ads?
Which is updated more often, Ring Sizer for Japan or MapViewer?
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