DBD+ vs QZsmart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DBD+
Unlock doors using your mobile phone via Bluetooth technology. Remotely share access with family and friends, and receive alerts for abnormal movement or low battery. Experience a convenient and efficient new way of life.
- Bluetooth door unlocking
- Remote key sharing
- Zero-distance contact with family/friends
- Abnormal movement alarm
- Weak current smart tips
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A don't have to take the key out of APP.Allows you to easily use a mobile phone unlock using bluetooth technology;Can remote sharing keys at the same time, realize you zero distance contact with family and friends in space and time;And abnormal movement alarm, weak current smart tips and individual character, more waiting for digging, you just to give you a convenient and efficient new way of life.
QZsmart
Control multiple smart devices remotely via Wi-Fi, eliminating the need for physical buttons. Schedule tasks with flexible timing and manage device settings easily. Shop for products and access customer service directly within the app.
- Wi-Fi product binding
- Multi-device control
- Flexible timing tasks
- Remote parameter settings
- In-app shopping
- Customer service access
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1. Bind the product through Wifi, saving the use of physical buttons for operation. 2. Can add multiple devices at the same time to realize one app to control all smart devices. 3. Flexible setting of timing tasks, accurate execution on time 4. View and modify the operation of products and parameter settings at any time 5. Can quickly shop and contact customer service through the app to protect customer rights and interests
Screenshots
Verdict
The clearest difference is rating: QZsmart at 4.3 against DBD+'s 2.3. DBD+'s advantage is review sentiment (30% vs 5%) and update cadence (every 2 months vs every 10 months). On price, ratings volume, 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.
QZsmart holds the better App Store score, 4.3 against 2.3. Both are backed by a comparable volume of ratings — 55 and 113 respectively. Written reviews complicate that: 30% of DBD+'s written reviews are positive against 5% of QZsmart's, so the app with the better star average is not the one people write more warmly about.
DBD+ ships an update every 2 months, QZsmart every 10 months. The most recent releases landed on August 12, 2026 and October 1, 2026 respectively.
| Parameter | DBD+ | QZsmart |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (55 ratings) | 4.3 (113 ratings) — better |
| Positive reviews | 30.0% of reviews — better | 4.5% of reviews |
| Number of ratings | 55 | 113 — better |
| Update frequency | Every 2 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 9.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 33 MB | 157 MB |
| Age rating | 4+ | 4+ |
| Developer | Shenzhen Dragon Brothers Digital Lock Co., Ltd. | AMZCHEF ELECTRIC CO. , LIMITED |
Customer experience
DBD+
QZsmart
In-app purchases
DBD+
No in-app purchases
QZsmart
No in-app purchases
