# Rally Timer Pro vs Rotax MAX Jetting

The clearest difference is price: Rotax MAX Jetting at Free against Rally Timer Pro's $9.99. Rotax MAX Jetting also leads on update cadence (every 3 months vs every 14 months). Rally Timer Pro's advantage is iOS requirement (12.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Rotax MAX Jetting is free to download; Rally Timer Pro costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rally Timer Pro ships an update every 14 months, Rotax MAX Jetting every 3 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Rally Timer Pro | Rotax MAX Jetting |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[1.9 (8 ratings)](https://appshunter.io/ios/app/rotax-max-jetting/id1152315347/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 7 MB | 13 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dream-Up](https://appshunter.io/developer/445196122) | [BRP-Rotax GmbH & Co KG](https://appshunter.io/developer/1152315346) |

## What reviewers say

### Rally Timer Pro

[App page](https://appshunter.io/ios/app/rally-timer-pro/id1078491284)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rotax MAX Jetting

[App page](https://appshunter.io/ios/app/rotax-max-jetting/id1152315347)

This app helps users find the ideal carburetor main jet size for Rotax kart engines. It calculates settings based on ambient conditions like temperature, altitude, and air pressure, either automatically via GPS or manually. Supports various Rotax MAX engine types.

**Highlights:** Optimal main jet calculation, Supports multiple Rotax MAX engines, Automatic GPS weather data, Manual ambient parameter entry, Celsius/Fahrenheit toggle, Meters/Feet toggle

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

**In-app purchases:** none


## Frequently asked questions

### Is Rally Timer Pro free?

Rally Timer Pro costs $9.99, with no in-app purchases.

### Is Rotax MAX Jetting free?

Rotax MAX Jetting is free to download, with no in-app purchases.

### Do Rally Timer Pro or Rotax MAX Jetting have ads?

Neither Rally Timer Pro nor Rotax MAX Jetting shows ads.

### Which is updated more often, Rally Timer Pro or Rotax MAX Jetting?

Rally Timer Pro ships an update every 14 months, and Rotax MAX Jetting every 3 months. Most recently, Rally Timer Pro was updated on October 29, 2026 and Rotax MAX Jetting on October 24, 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.*