# ATTOP HD vs Smart Device Controller

The clearest difference is iOS requirement: ATTOP HD at 5.1.1 against Smart Device Controller's 10.3. 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.

ATTOP HD ships an update every 4 months, Smart Device Controller every 3 months. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | ATTOP HD | Smart Device Controller |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.3 (6 ratings)](https://appshunter.io/ios/app/smart-device-controller/id1372692970/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 27.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 69 MB | 26 MB |
| Requires iOS | **5.1.1** | 10.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [俊溶 乔](https://appshunter.io/developer/1288385845) | [SEKISUI KINZOKU CO., LTD](https://appshunter.io/developer/1343709801) |

## What reviewers say

### ATTOP HD

[App page](https://appshunter.io/ios/app/attop-hd/id1042292613)

Control your four-axis aircraft remotely using your iOS device. Stream real-time video from the aircraft's camera and capture photos and videos directly to your phone or tablet.

**Highlights:** Remote aircraft control via WiFi, Real-time video streaming, Photo and video recording, Supports 720P video

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

**In-app purchases:** none


### Smart Device Controller

[App page](https://appshunter.io/ios/app/smart-device-controller/id1372692970)

Transform your smartphone into a wireless remote for model trains. It offers compatibility with Soundbox, allowing for operation or use as a wireless power pack without the Soundbox. Control your model train setups with ease.

**Highlights:** Wireless model train operation, Soundbox compatibility, Use as wireless power pack, Smartphone remote control

**In-app purchases:** none


## Frequently asked questions

### Is ATTOP HD free?

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

### Is Smart Device Controller free?

Smart Device Controller is free to download, with no in-app purchases.

### Do ATTOP HD or Smart Device Controller have ads?

Neither ATTOP HD nor Smart Device Controller shows ads.

### Which is updated more often, ATTOP HD or Smart Device Controller?

ATTOP HD ships an update every 4 months, and Smart Device Controller every 3 months. Most recently, ATTOP HD was updated on September 30, 2026 and Smart Device Controller on September 29, 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.*