# Fuel vs KTuner FlexFuel

The clearest difference is rating: KTuner FlexFuel at 5.0 against Fuel's 3.1. KTuner FlexFuel also leads on update cadence (daily vs every 10 months) and iOS requirement (11.0 vs 13.4). Fuel's advantage is ratings volume (33 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

KTuner FlexFuel holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Fuel has 33 ratings behind it against 1, so its average is the more settled of the two.

Fuel ships an update every 10 months, KTuner FlexFuel daily. The most recent releases landed on August 27, 2026 and August 19, 2026 respectively.

## The numbers

| Metric | Fuel | KTuner FlexFuel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (33 ratings)](https://appshunter.io/ios/app/fuel-it-eca/id1004246767/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ktuner-flexfuel/id6447161311/reviews)** |
| Number of ratings | **33** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Daily** |
| Monetization | Free | Free |
| Size | 20 MB | 41 MB |
| Requires iOS | 13.4 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dmac Mobile Developments, LLC](https://appshunter.io/developer/372235786) | [Peter Linszter](https://appshunter.io/developer/530077583) |

## What reviewers say

### Fuel

[App page](https://appshunter.io/ios/app/fuel-it-eca/id1004246767)

Monitor your vehicle's ethanol concentration and fuel temperature in real-time. This app wirelessly connects to a compatible Bluetooth module, freeing up your device's port for simultaneous charging and monitoring. It includes an ethanol fill-up concentration calculator and customizable display views.

**Highlights:** Real-time ethanol concentration monitoring, Real-time fuel temperature monitoring, Wireless Bluetooth connectivity, Ethanol fill-up concentration calculator, Fahrenheit or Celsius display options, Two display views

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

**In-app purchases:** none


### KTuner FlexFuel

[App page](https://appshunter.io/ios/app/ktuner-flexfuel/id6447161311)

This utility app connects to specific hardware units via Bluetooth to display real-time ethanol content and temperature. It provides essential data for users monitoring fuel mixtures.

**Highlights:** Bluetooth BLE connectivity, Real-time ethanol content display, Real-time temperature display, Supports KTuner FlexFuel units

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fuel free?

Fuel is free to download, with no in-app purchases.

### Is KTuner FlexFuel free?

KTuner FlexFuel is free to download, with no in-app purchases.

### Which has better reviews, Fuel or KTuner FlexFuel?

KTuner FlexFuel is rated higher. Fuel averages 3.1 out of 5 from 33 ratings, while KTuner FlexFuel averages 5.0 from 1 ratings.

### Do Fuel or KTuner FlexFuel have ads?

Neither Fuel nor KTuner FlexFuel shows ads.

### Which is updated more often, Fuel or KTuner FlexFuel?

Fuel ships an update every 10 months, and KTuner FlexFuel daily. Most recently, Fuel was updated on August 27, 2026 and KTuner FlexFuel on August 19, 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.*