# iVSP vs RocControl

The clearest difference is review sentiment: iVSP at 100% against RocControl's 50%. iVSP also leads on iOS requirement (13.0 vs 16.6). RocControl's advantage is update cadence (fortnightly vs every 21 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

iVSP ships an update every 21 months, RocControl fortnightly. The most recent releases landed on October 15, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | iVSP | RocControl |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ivsp/id1451717453/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 384 MB | 4 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Voith Digital Solutions Inc](https://appshunter.io/developer/1281566238) | [Rocrail](https://appshunter.io/developer/342277956) |

## What reviewers say

### iVSP

[App page](https://appshunter.io/ios/app/ivsp/id1451717453)

Experience ship navigation with Voith propulsion systems. Explore the mechanics and hydrodynamics of Voith Schneider Propellers (VSP) and their unique thrust capabilities on various vessel types. Learn about the innovative technology behind this propulsion system.

**Highlights:** Steer ships with Voith propulsion, Explore Voith Schneider Propeller mechanics, Understand VSP hydrodynamics, Simulate various vessel types, Learn about VSP thrust generation

**Features:** macOS Compatibility

**In-app purchases:** none


### RocControl

[App page](https://appshunter.io/ios/app/roccontrol/id6673909633)

Control your digital model railroad layouts remotely. Manage locomotives, switches, and signals, and set trains to run automatically. Connect to a Rocrail server to operate your entire layout from your mobile device.

**Highlights:** Control locomotives, switches, and signals, Automatic train operation, Dialogs for blocks, turntables, and staging yards, Dedicated locomotive throttle, Layout, driving, and system control tabs, Automatic connection to local Rocrail servers

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iVSP free?

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

### Is RocControl free?

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

### Do iVSP or RocControl have ads?

Neither iVSP nor RocControl shows ads.

### Which is updated more often, iVSP or RocControl?

iVSP ships an update every 21 months, and RocControl fortnightly. Most recently, iVSP was updated on October 15, 2026 and RocControl on September 30, 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.*