# 51数字钥匙 vs CDDK

The clearest difference is update cadence: 51数字钥匙 at every 3 weeks against CDDK's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

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

51数字钥匙 ships an update every 3 weeks, CDDK every 3 months. The most recent releases landed on September 24, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | 51数字钥匙 | CDDK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/51/id1595016316/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 59 MB | 45 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [深圳市卓联启航科技有限公司](https://appshunter.io/developer/1266211236) | [深圳市创艺慧云信息有限公司](https://appshunter.io/developer/1069607179) |

## What reviewers say

### 51数字钥匙

[App page](https://appshunter.io/ios/app/51/id1595016316)

This utility app uses Bluetooth to connect to your vehicle, allowing you to unlock, lock, and open the trunk directly from your phone. It eliminates the need to carry physical keys for these functions.

**Highlights:** Bluetooth vehicle connectivity, Remote car unlocking, Remote car locking, Remote trunk opening, Eliminates physical keys

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### CDDK

[App page](https://appshunter.io/ios/app/cddk/id1640293218)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 51数字钥匙 free?

51数字钥匙 is free to download, with no in-app purchases.

### Is CDDK free?

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

### Do 51数字钥匙 or CDDK have ads?

Neither 51数字钥匙 nor CDDK shows ads.

### Which is updated more often, 51数字钥匙 or CDDK?

51数字钥匙 ships an update every 3 weeks, and CDDK every 3 months. Most recently, 51数字钥匙 was updated on September 24, 2026 and CDDK on September 9, 2026.

---

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