アメフラシ vs Optical Path
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
アメフラシ
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「アメフラシ」では体験出来る降雨を20mm、50mm、70mm、100mm、187mmの5種類を準備しており、187mmは1982年(昭和57年)7月23日に発生した長崎大水害と同じ降雨量です。 ※アプリを長時間利用すると、端末の動きが遅くなることがあります。その場合は使用していない他のアプリ終了や、端末の再起動をお試し下さい。 ※本アプリで使用する降雨映像は、降雨体験機による模擬降雨を撮影したものです。実際の大雨においては、強い風や雨雲等の影響により、より視界が悪くなると考えられますが、本アプリを使って、雨の強さによる視界の変化を体験してください。 データ作成:福岡工業大学、CTIグランドプラニング
Optical Path
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This program is designed to illustrate the laws of reflection and refraction of light. As the laser pointer moves, the laser beam enters from the upper medium into the lower medium. When the two media differ, both reflection and refraction phenomena occur. When the refractive index of the upper medium is greater than that of the lower medium, and the angle of incidence exceeds the critical angle, a fascinating total internal reflection can be observed. This program is suitable for primary and secondary school students to learn and understand the laws of reflection and refraction of light, allowing them to review and reinforce physics concepts through engaging interactive activities. It can also be utilized by teachers for classroom demonstrations, enhancing lessons with a more lively and dynamic approach. The program's key features include: 1. Demonstration of reflection and refraction laws when the upper and lower media differ: The angle of reflection equals the angle of incidence, and the ratio of the sines of the angles of incidence and refraction equals the ratio of the refractive indices of the lower and upper media. 2. Demonstration of total internal reflection when the refractive index of the upper medium is greater than that of the lower medium: When the angle of incidence exceeds the critical angle, all incident light is reflected back, with no refracted light. 3. Selection of five laser colors - red, blue, green, orange, and purple - each corresponding to a unique refractive index. Lasers with higher frequencies exhibit greater refractive indices.
Screenshots
Verdict
The clearest difference is price: アメフラシ at Free against Optical Path's $1.99. Optical Path's advantage is update cadence (every 12 months vs every 53 months). On ads, in-app purchases, device support and iOS requirement 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
アメフラシ is free to download; Optical Path costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
アメフラシ ships an update every 53 months, Optical Path every 12 months. The most recent releases landed on September 17, 2026 and September 16, 2026 respectively.
| Parameter | アメフラシ | Optical Path |
|---|---|---|
| Price | Free — better | $1.99 |
| Update frequency | Every 53 months | Every 12 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 133 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | CTI GRAND PLANNING CO., LTD. | 坤 冉 |
In-app purchases
アメフラシ
No in-app purchases
Optical Path
No in-app purchases









