# Kart Pass vs Fox + Son Jetmax

The clearest difference is review sentiment: Fox + Son Jetmax at 100% against Kart Pass's 0%. Fox + Son Jetmax also leads on rating (5.0 vs 4.5) and ads (none vs shown). Kart Pass's advantage is in-app purchases (none vs 1) and ratings volume (173 vs 2). On price 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. Kart Pass asks for nothing beyond the download.

Fox + Son Jetmax holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Kart Pass has 173 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Kart Pass's written reviews are positive against 100% of Fox + Son Jetmax's.

Kart Pass ships an update every 6 weeks, Fox + Son Jetmax every 3 months. The most recent releases landed on October 23, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Kart Pass | Fox + Son Jetmax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (173 ratings)](https://appshunter.io/ios/app/kart-pass/id1528031831/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fox-plus-son-jetmax/id6748326003/reviews)** |
| Number of ratings | **173** | 2 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 69 MB | 16 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pit Pay Inc.](https://appshunter.io/developer/1489064520) | [Trophy Inc.](https://appshunter.io/developer/1752591571) |

## What reviewers say

### Kart Pass

[App page](https://appshunter.io/ios/app/kart-pass/id1528031831)

This app allows users to purchase pit passes for karting events in advance, saving time at the track. It offers secure electronic ID verification, waiver signing, and easy access to event information and navigation.

**Highlights:** Advance pit pass purchase, Electronic ID verification, Digital waiver signing, Favorite tracks and series, Event notifications, In-app navigation

**Features:** macOS Compatibility, Apple Wallet

**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 Kart Pass free?

Kart Pass 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.

### Which has better reviews, Kart Pass or Fox + Son Jetmax?

Fox + Son Jetmax is rated higher. Kart Pass averages 4.5 out of 5 from 173 ratings, while Fox + Son Jetmax averages 5.0 from 2 ratings.

### Do Kart Pass or Fox + Son Jetmax have ads?

Kart Pass shows ads; Fox + Son Jetmax does not.

### Which is updated more often, Kart Pass or Fox + Son Jetmax?

Kart Pass ships an update every 6 weeks, and Fox + Son Jetmax every 3 months. Most recently, Kart Pass was updated on October 23, 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.*