# VSI Spray Control vs TowCalc

The clearest difference is in-app purchases: VSI Spray Control at none against TowCalc's 1. VSI Spray Control also leads on iOS requirement (13.6 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. TowCalc sells 1 one-off in-app purchase. VSI Spray Control asks for nothing beyond the download.

VSI Spray Control ships an update every 3 weeks, TowCalc every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | VSI Spray Control | TowCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (225 ratings)](https://appshunter.io/ios/app/vsi-spray-control/id1531591443/reviews)** | — |
| Number of ratings | **225** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 17 MB | 3 MB |
| Requires iOS | **13.6** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Voigt Smith Innovation LLC](https://appshunter.io/developer/1529673044) | [InnovaLabWorks](https://appshunter.io/developer/1888514726) |

## What reviewers say

### VSI Spray Control

[App page](https://appshunter.io/ios/app/vsi-spray-control/id1531591443)

Control your VSI sprayer with advanced features like auto rate control using sensor and GPS data. Track your usage and gain a digital edge over competitors.

**Highlights:** Operate VSI sprayer, Auto rate control, Sensor data integration, GPS data integration, Usage tracking, CSV data export

**In-app purchases:** none


### TowCalc

[App page](https://appshunter.io/ios/app/towcalc-trailer-weights/id6790220566)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TowCalc Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is VSI Spray Control free?

VSI Spray Control is free to download, with no in-app purchases.

### Is TowCalc free?

TowCalc is free to download, with in-app purchases available.

### Do VSI Spray Control or TowCalc have ads?

Neither VSI Spray Control nor TowCalc shows ads.

### Which is updated more often, VSI Spray Control or TowCalc?

VSI Spray Control ships an update every 3 weeks, and TowCalc every 2 weeks. Most recently, VSI Spray Control was updated on November 3, 2026 and TowCalc on October 31, 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.*