# KartMAX PRO EVO vs Fox + Son Jetmax

The clearest difference is price: Fox + Son Jetmax at Free against KartMAX PRO EVO's $9.99. Fox + Son Jetmax also leads on rating (5.0 vs 2.0) and review sentiment (100% vs 83%). KartMAX PRO EVO's advantage is in-app purchases (none vs 1). On ratings volume, update cadence, ads and device support there is nothing between them.

Fox + Son Jetmax is free to download; KartMAX PRO EVO costs $9.99 up front. Fox + Son Jetmax sells 1 in-app purchase, starting at $7.99 per year. KartMAX PRO EVO asks for nothing beyond the download.

Fox + Son Jetmax holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 83% of KartMAX PRO EVO's written reviews are positive against 100% of Fox + Son Jetmax's.

KartMAX PRO EVO ships an update every 6 months, Fox + Son Jetmax every 3 months. The most recent releases landed on October 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | KartMAX PRO EVO | Fox + Son Jetmax |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [2.0 (5 ratings)](https://appshunter.io/ios/app/kartmax-pro-evo/id806348482/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fox-plus-son-jetmax/id6748326003/reviews)** |
| Number of ratings | **5** | 2 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | **Paid** | Subscription |
| Size | 108 MB | 16 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rafael Bartolome](https://appshunter.io/developer/382000336) | [Trophy Inc.](https://appshunter.io/developer/1752591571) |

## What reviewers say

### KartMAX PRO EVO

[App page](https://appshunter.io/ios/app/kartmax-pro-evo/id806348482)

This application provides precise engine tuning recommendations for Rotax MAX EVO karting engines. It calculates optimal jetting, needle clip position, and spark plug type based on real-time weather conditions and various engine configurations. It's designed for professional teams, tuners, and club racers to enhance performance.

**Highlights:** Jetting recommendations, Weather condition integration, Support for EVO and non-EVO engines, Multiple engine configurations, Spark plug type selection, Fuel octane and oil ratio adjustment, Carburetor ice warning

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

**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 KartMAX PRO EVO free?

KartMAX PRO EVO costs $9.99, with no in-app purchases.

### Is Fox + Son Jetmax free?

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

### Which has better reviews, KartMAX PRO EVO or Fox + Son Jetmax?

Fox + Son Jetmax is rated higher. KartMAX PRO EVO averages 2.0 out of 5 from 5 ratings, while Fox + Son Jetmax averages 5.0 from 2 ratings.

### Do KartMAX PRO EVO or Fox + Son Jetmax have ads?

Neither KartMAX PRO EVO nor Fox + Son Jetmax shows ads.

### Which is updated more often, KartMAX PRO EVO or Fox + Son Jetmax?

KartMAX PRO EVO ships an update every 6 months, and Fox + Son Jetmax every 3 months. Most recently, KartMAX PRO EVO was updated on October 10, 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.*