Key vs ZMAX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Key
This utility app allows users to remotely control and connect to devices, facilitating data transmission and collection. It enables over-the-air upgrades and social sharing, while also displaying meter speeds and reading device information directly from a mobile phone.
- Remote control and connection
- Data transmission and collection
- Over-the-air (OTA) upgrades
- Social sharing capabilities
- Meter speed display
- Device information reading
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1. Remote control and connection 2. Data transmission, collection, OTA upgrade, social sharing 3. The mobile phone APP realizes the display of the meter speed 4. Read device information
ZMAX
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ZMAX主要是针对本公司生产的ZMAX型号矩阵进行控制
Screenshots
Verdict
Key and ZMAX are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
Key ships an update every 6 months, ZMAX every 12 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | Key | ZMAX |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (5 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 6 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 266 MB | 72 MB |
| Age rating | 4+ | 4+ |
| Developer | Tianjin Key-Disp Technology Co.,Ltd | 日聪 吴 |
In-app purchases
Key
No in-app purchases
ZMAX
No in-app purchases
