Fox + Son Jetmax vs SetupKart Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
SetupKart Pro
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SetupKart Pro – Your Digital Kart Setup Tool No more paper notes at the track! SetupKart Pro records your complete kart setup digitally – from tire pressure to carburetor settings to lap times. Built by kart racers, for kart racers. TIRES & CHASSIS Cold and warm tire pressure, front and rear track width, camber adjustment with laser visualization – everything recorded and saved at a glance. ENGINE & CARBURETOR Main jet, idle, air screw, needle position, spark plug – with dedicated views for Dell'Orto and Tillotson carburetors. Rotax, IAME X30, Vortex, TM or Honda – all common engines supported. WEATHER & TRACK Temperature, weather conditions and GPS location of the track. Save your setup per circuit and load it in seconds on your next visit. LAP TIMES Record best times, import laptimer CSV files and track your progress throughout the season. Compare setups and find out what really makes you faster. SHARE YOUR SETUP Export your setup as a .kart file and share it via WhatsApp, email or Bluetooth with your teammates. VOICE INPUT Dictate notes by voice – perfect when your hands are dirty from wrenching. PRIVACY All data stays on your device. No cloud upload, no account needed, fully offline. Your setups belong to you – and only you. SUPPORTED ENGINES - Rotax Max, Junior, Mini, Micro - IAME X30 with Tillotson carburetor - Vortex Mini, Junior, Senior - TM KZ, OK - Honda GX, Rental - KZ Shifter Kart AVAILABLE IN 6 LANGUAGES German, English, French, Italian, Spanish, Dutch Try SetupKart Pro free for 30 days – all features included, no credit card required. Datenschutz: https://setupkart.ch/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: SetupKart Pro at weekly against Fox + Son Jetmax's every 3 months. On price, ads, in-app purchases 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 and SetupKart Pro sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.
Fox + Son Jetmax ships an update every 3 months, SetupKart Pro weekly. The most recent releases landed on September 23, 2026 and October 6, 2026 respectively.
| Parameter | Fox + Son Jetmax | SetupKart Pro |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Subscription | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 49 MB |
| Age rating | 4+ | 4+ |
| Developer | Trophy Inc. | Hermann Kopp |
In-app purchases
Fox + Son Jetmax
- Premium Yearly7 Days trial$7.991 Year
SetupKart Pro
- SetupKart Pro Monatsabo$5.991 Month
- Jahresabo2 variants$29.991 Year
Questions
Is Fox + Son Jetmax free?
Is SetupKart Pro free?
Do Fox + Son Jetmax or SetupKart Pro have ads?
Which is updated more often, Fox + Son Jetmax or SetupKart Pro?
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