# Promark VR vs SJ

The clearest difference is rating: SJ at 3.7 against Promark VR's 3.1. SJ also leads on review sentiment (33% vs 14%). On price, ratings volume, update cadence and ads there is nothing between them.

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

SJ holds the better App Store score, 3.7 against 3.1. Both are backed by a comparable volume of ratings — 55 and 23 respectively. Written reviews point the same way: 14% of Promark VR's written reviews are positive against 33% of SJ's.

Promark VR ships an update monthly, SJ every 3 weeks. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Promark VR | SJ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (55 ratings)](https://appshunter.io/ios/app/promark-vr/id1131572874/reviews) | **[3.7 (23 ratings)](https://appshunter.io/ios/app/sj-gps/id1238596836/reviews)** |
| Number of ratings | **55** | 23 |
| Positive reviews | 14.3% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 32 MB | 242 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ShanTou City Vison Electronictechnology Co., Ltd.](https://appshunter.io/developer/1388222999) | [Guangdong Shiji Technology Co.,Ltd.](https://appshunter.io/developer/1405540461) |

## 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


### SJ

[App page](https://appshunter.io/ios/app/sj-gps/id1238596836)

Control a toy quadrocopter using Wi-Fi and receive real-time video feedback. This application is compatible with a range of iOS devices and versions.

**Highlights:** Wi-Fi quadrocopter control, Real-time video transfer, Compatible with multiple iOS versions, Supports various iPhone models

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Promark VR free?

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

### Is SJ free?

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

### Which has better reviews, Promark VR or SJ?

SJ is rated higher. Promark VR averages 3.1 out of 5 from 55 ratings, while SJ averages 3.7 from 23 ratings.

### Do Promark VR or SJ have ads?

Neither Promark VR nor SJ shows ads.

### Which is updated more often, Promark VR or SJ?

Promark VR ships an update monthly, and SJ every 3 weeks. Most recently, Promark VR was updated on November 6, 2026 and SJ on November 2, 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.*