# DBD+ vs QZsmart

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.

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.

## The numbers

| Metric | DBD+ | QZsmart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (55 ratings)](https://appshunter.io/ios/app/dbd-plus/id1532426159/reviews) | **[4.3 (113 ratings)](https://appshunter.io/ios/app/qzsmart/id1602524485/reviews)** |
| Number of ratings | 55 | **113** |
| Positive reviews | **30.0% of reviews** | 4.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 33 MB | 157 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Dragon Brothers Digital Lock Co., Ltd.](https://appshunter.io/developer/1503502098) | [AMZCHEF ELECTRIC CO. , LIMITED](https://appshunter.io/developer/1602524487) |

## What reviewers say

### DBD+

[App page](https://appshunter.io/ios/app/dbd-plus/id1532426159)

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.

**Highlights:** Bluetooth door unlocking, Remote key sharing, Zero-distance contact with family/friends, Abnormal movement alarm, Weak current smart tips

**Features:** macOS Compatibility

**In-app purchases:** none


### QZsmart

[App page](https://appshunter.io/ios/app/qzsmart/id1602524485)

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.

**Highlights:** Wi-Fi product binding, Multi-device control, Flexible timing tasks, Remote parameter settings, In-app shopping, Customer service access

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DBD+ free?

DBD+ is free to download, with no in-app purchases.

### Is QZsmart free?

QZsmart is free to download, with no in-app purchases.

### Which has better reviews, DBD+ or QZsmart?

QZsmart is rated higher. DBD+ averages 2.3 out of 5 from 55 ratings, while QZsmart averages 4.3 from 113 ratings.

### Do DBD+ or QZsmart have ads?

Neither DBD+ nor QZsmart shows ads.

### Which is updated more often, DBD+ or QZsmart?

DBD+ ships an update every 2 months, and QZsmart every 10 months. Most recently, DBD+ was updated on August 12, 2026 and QZsmart on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*