D520 vs Join
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
D520
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起重機荷重保護 產品特性: ● 顯示型荷重超載限制器可對起重設備進行顯示和警報，當起吊物品時，傳感器產生變形，顯示型荷重超載限制器可以指 示出載荷的數值。 ● 高亮度紅色LED顯示螢幕 ● 重量過載異常時，蜂鳴器會發出警示音提醒操作人員，增強安全性。 ● 當重量超過額定負重時，超載控制器會自動切斷起升機構的動力源，避免事故發生
Join
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Join-System allows you to use the APP to observe the environmental variables of the place you specify You can use Join-Cloud so that you can see your environmental data through the Internet wherever you are You can observe the environmental variables around you in a safe way through Join-LAN We even provide remote control function, allowing you to remotely control the relays on the device For such a powerful system, please contact Jade Electronics. We will serve you wholeheartedly!
Screenshots
Verdict
The clearest difference is update cadence: Join at every 2 months against D520's every 4 months. D520's advantage is iOS requirement (11.0 vs 15.6). 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.
D520 ships an update every 4 months, Join every 2 months. The most recent releases landed on September 28, 2026 and September 27, 2026 respectively.
| Parameter | D520 | Join |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 8 MB | 40 MB |
| Age rating | 4+ | 4+ |
| Developer | SYSCODE INTERNATIONAL INC. | JETEC ELECTRONIC CO., LTD. |
In-app purchases
D520
No in-app purchases
Join
No in-app purchases
