ZenSim vs Gauge King
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ZenSim
Manage your eSIMs, purchase travel data plans, and monitor your usage. This app allows you to activate new eSIMs, order add-ons, and change your service plan easily.
- eSIM activation
- Buy travel eSIMs
- Account management
- Usage monitoring
- Order add-ons
- Change plan
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Welcome to the ZenSim app, where you can activate your eSIMs, buy Travel eSIMs, manage your account, check your usage, order add-ons, change your plan and more.
Gauge King
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Gauge King turns your iPhone into a clean, customisable digital gauge dashboard for your car. Connect a compatible Bluetooth OBDII reader and view live vehicle telemetry in a modern dashboard designed for drivers, enthusiasts, and anyone who wants a clearer view of what their car is doing. Build your own gauge layout, choose the data that matters to you, and monitor key information in real time. Gauge King can display supported vehicle data such as: RPM Speed Coolant temperature Intake air temperature Throttle position Engine load Battery voltage Fuel-related data as well as shift light layouts, calculated horsepower/Kw data and much more. Gauge King also includes Demo Mode, allowing you to experience the dashboard using simulated telemetry even when you are not connected to an OBDII reader. This is useful for trying layouts, testing gauges, previewing the app, or seeing how the dashboard feels before connecting to a vehicle. Features include: Customisable digital gauge dashboards Audible warnings based on configurable thresholds Apple CarPlay support Compatible Bluetooth OBDII reader support Live vehicle telemetry where supported by the vehicle and adapter Demo Mode with simulated data Performance-inspired gauge layouts Clear connection status Designed for car enthusiasts and everyday drivers Gauge King is built to make vehicle data easier to see, understand, and enjoy. Important notes: Gauge King requires a compatible Bluetooth OBDII reader for live vehicle telemetry. Available telemetry depends on your vehicle, OBDII adapter, and supported sensors. Demo Mode uses simulated data and does not show real vehicle information. Gauge King is intended for information and display purposes only. Always drive safely and follow local road rules. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: ZenSim at none against Gauge King's 1. ZenSim also leads on iOS requirement (15.1 vs 17.2). Gauge King's advantage is update cadence (every 5 days vs every 3 weeks). On price, 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
Both are free to download. Gauge King sells 1 in-app purchase, starting at $9.99 per year. ZenSim asks for nothing beyond the download.
ZenSim ships an update every 3 weeks, Gauge King every 5 days. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.
| Parameter | ZenSim | Gauge King |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (3 ratings) — better | — |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.2 |
| Further details — not scored | ||
| Size | 53 MB | 8 MB |
| Age rating | 9+ | 4+ |
| Developer | ZenSim | Mark Ross |
In-app purchases
ZenSim
No in-app purchases
Gauge King
- Gauge King Premium7 Days trial$9.991 Year
