K vs Dr. Copper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
K
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■ How to use The login screen displays after the application starts. Enter your user ID and password. And select a function from the main menu. ■ Note This app is for authorized KOBELCO dealers ONLY. KOBELCO user ID required.
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 K's every 4 months. K's advantage is iOS requirement (12.4 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.
K ships an update every 4 months, Dr. Copper every 4 days. The most recent releases landed on September 12, 2026 and May 16, 2026 respectively.
| Parameter | K | 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 | 12.4 — better | 14.0 |
| Further details — not scored | ||
| Size | 67 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | KOBELCO CONSTRUCTION MACHINERY CO., LTD. | JX NIPPON MINING & METALS CORPORATION |
In-app purchases
K
No in-app purchases
Dr. Copper
No in-app purchases
