# Promark VR vs Dock Line Calculator

The clearest difference is in-app purchases: Promark VR at none against Dock Line Calculator's 1. Promark VR also leads on iOS requirement (12.0 vs 16.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Dock Line Calculator sells 1 one-off in-app purchase. Promark VR asks for nothing beyond the download.

Promark VR ships an update monthly, Dock Line Calculator every 2 months. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Promark VR | Dock Line Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (55 ratings)](https://appshunter.io/ios/app/promark-vr/id1131572874/reviews)** | — |
| Number of ratings | **55** | — |
| Positive reviews | 14.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free | — |
| Size | 32 MB | 2 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ShanTou City Vison Electronictechnology Co., Ltd.](https://appshunter.io/developer/1388222999) | [EVREN YUCEBAS](https://appshunter.io/developer/6782353474) |

## What reviewers say

### Promark VR

[App page](https://appshunter.io/ios/app/promark-vr/id1131572874)

Control a toy quadrocopter via Wi-Fi with real-time video streaming. This application enables seamless piloting and visual feedback from your drone.

**Highlights:** Wi-Fi quadrocopter control, Real-time video transfer, Drone piloting, Live video feed

**Features:** macOS Compatibility

**In-app purchases:** none


### Dock Line Calculator

[App page](https://appshunter.io/ios/app/dock-line-calculator/id6792283809)

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dock Line Calculator Pro | $4.99 | one-time |


## Frequently asked questions

### Is Promark VR free?

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

### Is Dock Line Calculator free?

Dock Line Calculator is free to download, with in-app purchases available.

### Do Promark VR or Dock Line Calculator have ads?

Neither Promark VR nor Dock Line Calculator shows ads.

### Which is updated more often, Promark VR or Dock Line Calculator?

Promark VR ships an update monthly, and Dock Line Calculator every 2 months. Most recently, Promark VR was updated on November 6, 2026 and Dock Line Calculator on November 10, 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.*