GJ vs Dr. Copper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GJ
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GJ-Cloud MobileソフトウェアはiOS10.0以降のバージョンのiPhoneおよびiPadにインストールできます。Wi-Fiや4G LTEネットワークを利用してGJ-Cloudサーバにアクセスし、遠隔地のカメラやレコーダーのライブビュー、リモート再生、アラーム通知の受信などが行えます。
Dr. Copper
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Map-style display of various copper alloys enables identification of the optimal copper alloy for any application. By selecting products of interest on the map, users can also check product performance details in a radar chart format. In addition, access to the latest JX Metals catalog enables users to confirm recommended applications, real-world usages, and product-specific features. For more detailed information, users can inquire to the JX Metals support desk via the in-app chat function.
Screenshots
Verdict
The clearest difference is update cadence: Dr. Copper at every 4 days against GJ's every 4 months. GJ's advantage is iOS requirement (10.0 vs 14.0). On price, ads, in-app purchases and device support 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.
GJ ships an update every 4 months, Dr. Copper every 4 days. The most recent releases landed on October 8, 2026 and October 2, 2026 respectively.
| Parameter | GJ | Dr. Copper |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 10.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 183 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Grasphere Japan Co., Ltd. | JX NIPPON MINING & METALS CORPORATION |
In-app purchases
GJ
No in-app purchases
Dr. Copper
No in-app purchases
