# D vs Ultimate Cardin

The clearest difference is iOS requirement: D at 10.0 against Ultimate Cardin's 13.0. On price, update cadence, 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.

D ships an update every 5 weeks, Ultimate Cardin monthly. The most recent releases landed on October 7, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | D | Ultimate Cardin |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Free | — |
| Size | 23 MB | 17 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SECUREMME SRL](https://appshunter.io/developer/1076281466) | [CARDIN ELETTRONICA S.p.A.](https://appshunter.io/developer/965252906) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-smart/id1076281467)

Transform your existing European cylinder locks into smart locks with this device. Control your doors remotely via smartphone, manage access permissions, and create virtual keys. Enjoy convenient and secure access control without needing to replace your current lock.

**Highlights:** Automate European cylinder locks, Smartphone control via Bluetooth, Virtual key creation, Timed access management, User access control, Multiple access methods (transponder, keypad)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ultimate Cardin

[App page](https://appshunter.io/ios/app/ultimate-cardin/id1635143076)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is Ultimate Cardin free?

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

### Do D or Ultimate Cardin have ads?

Neither D nor Ultimate Cardin shows ads.

### Which is updated more often, D or Ultimate Cardin?

D ships an update every 5 weeks, and Ultimate Cardin monthly. Most recently, D was updated on October 7, 2026 and Ultimate Cardin on October 18, 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.*