# DDLock vs Kstert

The clearest difference is update cadence: Kstert at every 3 weeks against DDLock's every 4 months. Kstert also leads on review sentiment (37% vs 20%). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 2.9 for DDLock against 2.9 for Kstert. Both are backed by a comparable volume of ratings — 99 and 36 respectively. Written reviews are what separate them: 20% of DDLock's written reviews are positive against 37% of Kstert's.

DDLock ships an update every 4 months, Kstert every 3 weeks. The most recent releases landed on October 10, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | DDLock | Kstert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.9 (99 ratings)](https://appshunter.io/ios/app/ddlock/id6443749440/reviews)** | [2.9 (36 ratings)](https://appshunter.io/ios/app/kstert/id6476297297/reviews) |
| Number of ratings | **99** | 36 |
| Positive reviews | 20.0% of reviews | **36.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 407 MB | 105 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Shenzhen Kaadas Intelligent Technology Co.,Ltd](https://appshunter.io/developer/1155786021) | [Shenzhen Aierweile Electronics Co., Ltd](https://appshunter.io/developer/1777735349) |

## What reviewers say

### DDLock

[App page](https://appshunter.io/ios/app/ddlock/id6443749440)

Unlock your doors using your smartphone, eliminating the need for physical keys. This app offers a more convenient and modern way to manage access to your locks.

**Highlights:** Unlock with smartphone, Eliminates physical keys, Convenient lock access, Modern security solution

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Kstert

[App page](https://appshunter.io/ios/app/kstert/id6476297297)

Control Bluetooth devices and connect with friends through integrated social features. Discover new and exciting ways to interact with your devices and community.

**Highlights:** Bluetooth device control, Integrated social features, Discover new gameplay, Connect with friends

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DDLock free?

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

### Is Kstert free?

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

### Which has better reviews, DDLock or Kstert?

DDLock is rated higher. DDLock averages 2.9 out of 5 from 99 ratings, while Kstert averages 2.9 from 36 ratings.

### Do DDLock or Kstert have ads?

Neither DDLock nor Kstert shows ads.

### Which is updated more often, DDLock or Kstert?

DDLock ships an update every 4 months, and Kstert every 3 weeks. Most recently, DDLock was updated on October 10, 2026 and Kstert on October 9, 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.*