Unipro ApS vs Fox + Son Jetmax
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Unipro ApS
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Download and analyze sessions from your UniStop V2 stopwatch and UniTire V2 pressure gauge. Change settings and update your UniStop V2 and UniTire V2.
Fox + Son Jetmax
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.
- Rotax engine jetting calculator
- Weather and altitude adjustments
- Relative horsepower calculation
- Interactive gear chart
- Rotax tuning tips
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Precision jetting made easy — This app helps you calculate jetting for Rotax engines based on weather and altitude. Now every Rotax racer has access to the same jetting Fox + Son has used to power our engines to countless Rotax National wins and Grand Finals tickets. After many months of development and testing, we have successfully brought the same jetting algorithms we use on our dyno to a quick, easy-to-use app. We have also included all of our popular Rotax tuning tips that are found on our website, along with a handy interactive gear chart for your convenience. As we do with our website, we will continually update the app as we discover new tuning information. Anytime a new cylinder or part is introduced, all of the testing we do at the shop will flow directly to Jetmax. Jetmax will also calculate the relative horsepower for that atmospheric condition. The relative horsepower percentage is helpful information to have when selecting your gear ratio. In certain situations you can benefit from increasing your gear ratio when HP is low & decreasing your gear ratio when HP is high. Whether you're competing at the track or fine-tuning your kart for practice, Jetmax gives you accurate, reliable recommendations so you can focus on performance. Features: - Jetting calculator for Rotax engines - Calculates relative horsepower - Includes an interactive gearing chart Engineered by racers, for racers — Fox + Son Jetmax App delivers the tools you need to stay competitive on race day. *You must have a valid subscription in order to use this app.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Unipro ApS | Fox + Son Jetmax |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 21 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Subscription |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 63 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Unipro ApS | Trophy Inc. |
In-app purchases
Unipro ApS
No in-app purchases
Fox + Son Jetmax
- Premium Yearly7 Days trial$7.991 Year
Questions
Is Unipro ApS free?
Is Fox + Son Jetmax free?
Do Unipro ApS or Fox + Son Jetmax have ads?
Which is updated more often, Unipro ApS or Fox + Son Jetmax?
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