# Diamond X

> Diamond X (iPhone/iPad app by ICHIROU YONEYAMA.)

- Source: https://appshunter.io/ios/app/diamond-x/id1549199609 (this page in markdown: same URL + `.md`)
- Developer: [ICHIROU YONEYAMA](https://appshunter.io/developer/1546688205)
- Category: Lifestyle
- Price: $3.99
- Age rating: 4+
- Requires: iOS 11.0 · 12 MB
- Languages: English, Japanese
- Released: 2021-01-28
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/diamond-x/id1549199609/reviews.md

## What is Diamond X?

You can easily find the date and time of Diamond Fuji.
Since GPS and Web maps can be used, diamonds from any location are OK.
Diamonds other than Mt. Fuji are also OK.
Data on more than 1200 mountains all over Japan, Tokyo Metropolitan Government Building, Tokyo Tower, Tokyo Sky Tree, etc. are built-in.
As with "Yamaotaku for Mac (Yamac)", the curvature of the earth and atmospheric refraction are taken into consideration, and highly accurate results can be obtained.
It supports Japanese and English display and automatically switches according to the setting of the language used on the iPhone.
You can share location data files with your Mac or Windows.


## Version history (last 5 releases)

### 1.1.7 — 2025-04-14

Due to a change in GSI Map specifications, web maps were no longer available, but we have made an effort to make web maps available.
This will be the last update for Diamond X.
You can continue to use the app even after the update has ended.
Thank you for using the app so far.
The successor app will be Diamond X2, which is scheduled to be released in the future.

### 1.1.6 — 2022-12-09

Changed primary language to English.

### 1.1.5 — 2022-02-08

1. Fixed a bug that the number of calculation days becomes one day when the calculation is executed after changing the calculation start date of diamond.
2. Added a button that can display the displayed latitude / longitude location on the WebMap on the screen for selecting the current location and destination from the list.

### 1.1.4 — 2022-02-06

1. When saving to a shared file myData with Mac, even if the data with the same name already exists, it can be saved as another data without overwriting.
2. Added 15 points of mountain data from Tokyo.

### 1.1.3 — 2022-02-02

Added diamond x,diamondx,diamondfuji to the search keywords on the App Store.
After that, you can search with the following keywords.
Diamond Fuji, Mt. Fuji, Sun, Sunrise, Sunset, Atmospheric refraction, diamond x, diamond x, diamondfuji

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## More apps by ICHIROU YONEYAMA

- [Diamond X Lite](https://appshunter.io/ios/app/diamond-x-lite/id1552168001)
- [Diamond X2](https://appshunter.io/ios/app/diamond-x2/id6747324547)
- [Diamond X2 Lite](https://appshunter.io/ios/app/diamond-x2-lite/id6751737883)

All apps by ICHIROU YONEYAMA: https://appshunter.io/developer/1546688205

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-19.*