# Prisma Electronics vs Fox + Son Jetmax

The clearest difference is in-app purchases: Prisma Electronics at none against Fox + Son Jetmax's 1. Fox + Son Jetmax's advantage is update cadence (every 3 months vs every 7 months) and iOS requirement (15.1 vs 17.0). 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. Prisma Electronics asks for nothing beyond the download.

Prisma Electronics ships an update every 7 months, Fox + Son Jetmax every 3 months. Both last shipped on September 23, 2026.

## The numbers

| Metric | Prisma Electronics | 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 7 months | **Every 3 months** |
| Monetization | — | Subscription |
| Size | 14 MB | 16 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Prisma Electronics srl](https://appshunter.io/developer/1766155967) | [Trophy Inc.](https://appshunter.io/developer/1752591571) |

## What reviewers say

### Prisma Electronics

[App page](https://appshunter.io/ios/app/prisma-electronics/id6670408611)

**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 Prisma Electronics free?

Prisma Electronics 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 Prisma Electronics or Fox + Son Jetmax have ads?

Neither Prisma Electronics nor Fox + Son Jetmax shows ads.

### Which is updated more often, Prisma Electronics or Fox + Son Jetmax?

Prisma Electronics ships an update every 7 months, and Fox + Son Jetmax every 3 months. Most recently, Prisma Electronics was updated on September 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.*