# PrimeServ EyeTech vs D

The clearest difference is iOS requirement: D at 13.0 against PrimeServ EyeTech's 18.0. 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.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 22, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | PrimeServ EyeTech | D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 73 MB | 15 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Maintastic GmbH](https://appshunter.io/developer/1351261559) | [Winkong Marine Engineering Co.,Ltd.](https://appshunter.io/developer/1602619555) |

## What reviewers say

### PrimeServ EyeTech

[App page](https://appshunter.io/ios/app/primeserv-eyetech/id1471501306)

**Features:** Vision Pro support

**In-app purchases:** none


### D

[App page](https://appshunter.io/ios/app/d-vesselkeeper/id6677012335)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PrimeServ EyeTech free?

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

### Is D free?

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

### Do PrimeServ EyeTech or D have ads?

Neither PrimeServ EyeTech nor D shows ads.

### Which is updated more often, PrimeServ EyeTech or D?

PrimeServ EyeTech ships an update every 2 months, and D every 2 months. Most recently, PrimeServ EyeTech was updated on October 22, 2026 and D on October 6, 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.*