NFC Badge vs Diamond X2 Lite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NFC Badge
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-需搭配由NFCtoGO.com發行的NFC BADGE金卡及SEAL憑證貼標來使用。 -NFC BADGE金卡可簽發代表本人的創作、識別、簽證、擁有、收藏、特許、授權等的SEAL憑證。 -SEAL此憑證可以內嵌模組、封籤貼紙、保證卡等型式存在,並保存於其內的NFC TAG晶片中。 -以此App感應BADGE卡後,集可編修擁有者資料,並將本人的簽章加簽至新的SEAL貼標內,以作為憑證之用。
Diamond X2 Lite
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This is a trial version of the "Diamond X2" app. "Diamond X2" makes it easy to find the date and time of Diamond Fuji. By setting your "Viewpoint" to the Tokyo Metropolitan Building North Observatory or Tokyo Metropolitan Building South Observatory, you can experience and check all of its features without any restrictions. Select "List" from the "Viewpoint" view, tap "Select from Facilities, etc. (Built-in Data)," and select either the Tokyo Metropolitan Building North Observatory or Tokyo Metropolitan Building South Observatory. We would appreciate it if you would purchase "Diamond X2" after trying out this app. You can use GPS and web maps to create diamonds from any location. Diamonds other than Mt. Fuji are also possible. The app includes built-in data for over 1,200 mountains across Japan, as well as the Tokyo Metropolitan Building Observatory, Tokyo Tower, Tokyo Skytree, and more. Like "Yamaotaku for Mac (Yamac)," it takes into account the curvature of the Earth and atmospheric refraction to produce highly accurate results. It supports both Japanese and English display, automatically switching based on your iPhone's language setting. Location data files can be shared with Mac and Windows. Differences from "Diamond X" 1. Diamond-eligible locations are now marked with a checkmark in the location selection list. This allows you to quickly find diamond-eligible locations. Calculation speed has been significantly improved, allowing for stress-free use of this feature. 2. Mount Fuji can now be displayed from any location, regardless of whether diamonds are available. 3. The sun's altitude and shape reflect atmospheric refraction. (At low altitudes, the display will be vertically compressed.) 4. Sunrise and sunset times for a specified period can be displayed in a list. 5. Improved support for calculation errors. 6. Improved calculation accuracy. 7. Multi-core support significantly improves calculation performance. 8. Added the ability to transfer calculation results to other apps. 9. The UTC offset corresponding to the viewpoint's time zone can now be set automatically or manually, allowing support for time zones other than Japan. 10. Help is now available for some functions. (Tap the ? icon to display it) 11. Instructions for sharing files with your PC, such as myData, are now displayed. 12. More languages are now supported. 13. An on/off switch for transparency has been added. 14. Diamond misalignment display can now be selected between "m" and "degrees." 15. A new switch has been added to reset settings.
Screenshots
Verdict
The clearest difference is iOS requirement: NFC Badge at 12.4 against Diamond X2 Lite's 14.0. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
NFC Badge ships an update every 3 weeks, Diamond X2 Lite every 2 weeks. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.
| Parameter | NFC Badge | Diamond X2 Lite |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.4 — better | 14.0 |
| Further details — not scored | ||
| Size | 54 MB | 15 MB |
| Age rating | 17+ | 4+ |
| Developer | Revtel Tech co.ltd | ICHIROU YONEYAMA |
In-app purchases
NFC Badge
No in-app purchases
Diamond X2 Lite
No in-app purchases









