# D vs e

The clearest difference is iOS requirement: D at 13.0 against e's 15.0. 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 3 weeks, e every 6 weeks. The most recent releases landed on September 17, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | D | e |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (97 ratings)](https://appshunter.io/ios/app/d-keys/id1502365079/reviews)** | — |
| Number of ratings | **97** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free | — |
| Size | 134 MB | 3 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Kuznetsova Vera](https://appshunter.io/developer/1451290672) | [Center for Research in Perspective Technologies - Armenia LLC](https://appshunter.io/developer/1706506047) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-keys/id1502365079)

Remotely control your intercom with a single button press on your smartphone. Open your building's entrance door from anywhere using Wi-Fi or mobile data. Registration is required to ensure security and access.

**Highlights:** Remote door opening, Single-button control, Works via Wi-Fi or mobile data, Supports multiple entrances, Remote access for guests, Secure registration process

**In-app purchases:** none


### e

[App page](https://appshunter.io/ios/app/e-mark-app/id6465251159)

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

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is e free?

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

### Do D or e have ads?

Neither D nor e shows ads.

### Which is updated more often, D or e?

D ships an update every 3 weeks, and e every 6 weeks. Most recently, D was updated on September 17, 2026 and e on September 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.*