Jetting Rotax Max Kart vs Kartz
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Jetting Rotax Max Kart
This app provides jetting recommendations for Rotax 125 Max non-EVO kart engines using environmental data and engine configuration. It offers two tuning modes and detailed insights into fuel mix quality and carburetor performance.
- Jetting recommendations for Rotax 125 Max engines
- Automatic weather data acquisition
- Two tuning modes: 'By regulations' and 'Freestyle'
- Detailed tuning parameters
- History of jetting setups
- Graphic display of fuel mix quality
- Adjustable fuel/oil ratio
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This app provides, using temperature, altitude, humidity, atmospheric pressure and your engine configuration, a recommendation about jetting for karts with Rotax 125 Max non-EVO engines, which use a Dellorto VHSB 34 QS/QD carbs: • Micro with stop sleeve RTX251730 • Micro/Mini with restrictor RTX267530 or RTX267535 • Micro/Mini without any restrictors • Junior • Senior • DD2 • Supermax This app can obtain automatically the position and altitude to get the temperature, pressure and humidity from the nearest weather station thought internet. Internal barometer is used on supported devices for better precision. Application can run without GPS, WiFi and internet, in this case user has to enter weather data manually. • Two different tuning modes: "By regulations" and "Freestyle"! • In first mode, the following values are given: main jet, spark plug, spark plug gap, needle type and position (including intermediate positions with washer), air screw position, idle screw position, optimal water temp, gear oil recommendation • In second mode (Freestyle), the following values are given: main jet, spark plug, emulsion tube, needle, needle type and position (including intermediate positions with washer), venturi, idle jet (outer pilot jet), idle emulsifier (inner pilot jet), air screw position • Fine tuning for all these values • History of all your jetting setups • Graphic display of fuel mix quality (Air/Flow Ratio or Lambda) • Selectable fuel type (VP MS93, gasoline with or without ethanol) • Adjustable fuel/oil ratio • Adjustable floats height • Mix wizard to get the perfect mix ratio (fuel calculator) • Carburetor ice warning • Possibility of use automatic weather data or a portable weather station. • If you don't want to share your location, you can manually select any place in the world, jetting recommendation will be adapted for this place • let you use different measure units: ºC y ºF for temperatures, meter and feet for altitude, liters, ml, gallons, oz for fuel, and mb, hPa, mmHg, inHg atm for pressures The application contains four tabs, which are described next: • Results: In this tab two jetting setups are shown. These data are calculated depending on the weather conditions and the engine and track configuration given in the next tabs. This tab lets do a fine tuning adjustment for all values for each jetting setup to adapt to the concrete engine. Besides this jetting information, the air density, density altitude, relative air density, SAE - dyno correction factor, station pressure, SAE - relative horsepower, oxygen pressure and volumetric content of oxygen are shown too. You can also see in a graphic form the calculated ratio of air and fuel (lambda). • History: This tab contains the history of all jetting setups. If you change the weather, or engine setup, or fine tuning, the new setup will be saved in history. • Engine: You can configure in this screen the information about the engine, that is, engine model (Micro Max, Mini Max, Junior Max, Senior, Max DD2), needle type, float type and height, venturi (8.5 or 12.5), idle jet, idle emulsifier, fuel type, oil mix ratio and type of the track. Depending of this parameters, the jetting setups will be adapted. • Weather: In this tab, you can set the values for current temperature, pressure, altitude and humidity. Also this tab allows to use the GPS to get the current position and altitude, and connect to an external service to get the weather conditions of the nearest weather station. In addition, this app can work with a pressure sensor built into the iPhone. You can see if it is available on your device and turn it on or off. For Rotax Max EVO Engine please try our other app: Jetting Rotax Max Evo Kart. If you have any doubt about using this App, please, contact us. We answer every question, and we take care of all comments from our users to try to improve our software. We are also users of this application.
Kartz
Track your karting lap times, compare your performance across circuits, and connect with a community of amateur drivers in France. Discover nearby tracks, share your sessions, and earn badges for your achievements.
- Record lap times
- Track progress circuit by circuit
- Compare times with other drivers
- Discover nearby circuits
- Share and comment on sessions
- Unlock performance badges
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Kartz, c'est l'app de la communauté karting amateur en France. Enregistre chaque session, garde une trace de tes meilleurs temps et suis ta progression circuit par circuit. Fini les chronos gribouillés sur ton téléphone : tout est au même endroit, propre et comparable. CE QUE TU PEUX FAIRE • Enregistrer tes chronos et retrouver ton meilleur temps sur chaque piste • Te comparer aux autres pilotes sur le classement de ton circuit • Suivre ta progression dans le temps • Découvrir les circuits près de chez toi sur la carte • Partager tes sessions dans le fil, liker et commenter celles des autres • Débloquer des badges au fil de tes performances POUR QUI Que tu roules en loisir le week-end ou que tu vises le podium, Kartz te donne les outils pour suivre et améliorer tes temps. Rejoins les pilotes déjà sur Kartz et montre ce que tu as dans le moteur. Conditions d'utilisation (EULA) : https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Politique de confidentialité : https://kartz.fr/privacy
Screenshots
Verdict
The clearest difference is price: Kartz at Free against Jetting Rotax Max Kart's $7.99. Kartz also leads on update cadence (weekly vs monthly) and review sentiment (100% vs 92%). Jetting Rotax Max Kart's advantage is in-app purchases (none vs 7) and iOS requirement (9.0 vs 15.0). On ads 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
Kartz is free to download; Jetting Rotax Max Kart costs $7.99 up front. Kartz sells 7 in-app purchases, starting at $3.99 per month. Jetting Rotax Max Kart asks for nothing beyond the download.
Jetting Rotax Max Kart ships an update monthly, Kartz weekly. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.
| Parameter | Jetting Rotax Max Kart | Kartz |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | 4.9 (9 ratings) — better | — |
| Positive reviews | 91.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 9 — better | — |
| Update frequency | Monthly | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 40 MB | 107 MB |
| Age rating | 4+ | 12+ |
| Developer | Ballistic Solutions LLC | Theo manzella |
Customer experience
Jetting Rotax Max Kart
Kartz
In-app purchases
Jetting Rotax Max Kart
No in-app purchases
Kartz
- Kartz Pro3 Days trial$3.991 Month
- Kartz Pro$34.991 Year
- 100 boulons$0.99
- 250 boulons$1.99
- 450 boulons$3.99
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- 700 boulons$5.99
- 2 100 boulons$19.99
Questions
Is Jetting Rotax Max Kart free?
Is Kartz free?
Do Jetting Rotax Max Kart or Kartz have ads?
Which is updated more often, Jetting Rotax Max Kart or Kartz?
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