# Unipro ApS vs Fox + Son Jetmax

The clearest difference is in-app purchases: Unipro ApS at none against Fox + Son Jetmax's 1. Unipro ApS also leads on iOS requirement (12.0 vs 15.1). Fox + Son Jetmax's advantage is update cadence (every 3 months vs every 21 months). On price, ads and device support there is nothing between them.

Both are free to download. Fox + Son Jetmax sells 1 in-app purchase, starting at $7.99 per year. Unipro ApS asks for nothing beyond the download.

Unipro ApS ships an update every 21 months, Fox + Son Jetmax every 3 months. The most recent releases landed on October 14, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Unipro ApS | Fox + Son Jetmax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fox-plus-son-jetmax/id6748326003/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 3 months** |
| Monetization | — | Subscription |
| Size | 63 MB | 16 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Unipro ApS](https://appshunter.io/developer/933636605) | [Trophy Inc.](https://appshunter.io/developer/1752591571) |

## What reviewers say

### Unipro ApS

[App page](https://appshunter.io/ios/app/unipro-aps/id933636606)

**Features:** macOS Compatibility

**In-app purchases:** none


### Fox + Son Jetmax

[App page](https://appshunter.io/ios/app/fox-plus-son-jetmax/id6748326003)

This application simplifies jetting calculations for Rotax engines, factoring in weather and altitude. It provides racers with precise tuning recommendations, including relative horsepower and an interactive gear chart, to optimize performance on race day.

**Highlights:** Rotax engine jetting calculator, Weather and altitude adjustments, Relative horsepower calculation, Interactive gear chart, Rotax tuning tips

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Yearly | $7.99 | per year |


## Frequently asked questions

### Is Unipro ApS free?

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

### Is Fox + Son Jetmax free?

Fox + Son Jetmax is free to download, with in-app purchases available.

### Do Unipro ApS or Fox + Son Jetmax have ads?

Neither Unipro ApS nor Fox + Son Jetmax shows ads.

### Which is updated more often, Unipro ApS or Fox + Son Jetmax?

Unipro ApS ships an update every 21 months, and Fox + Son Jetmax every 3 months. Most recently, Unipro ApS was updated on October 14, 2026 and Fox + Son Jetmax on September 23, 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.*