# e85Cal vs KTuner FlexFuel

The clearest difference is update cadence: KTuner FlexFuel at daily against e85Cal's every 4 months. KTuner FlexFuel also leads on rating (5.0 vs 4.7). e85Cal's advantage is ratings volume (35 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 4.7. That said, the two scores are not equally well evidenced: e85Cal has 35 ratings behind it against 1, so its average is the more settled of the two.

e85Cal ships an update every 4 months, KTuner FlexFuel daily. The most recent releases landed on July 23, 2026 and August 19, 2026 respectively.

## The numbers

| Metric | e85Cal | KTuner FlexFuel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (35 ratings)](https://appshunter.io/ios/app/e85cal/id1470313135/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ktuner-flexfuel/id6447161311/reviews)** |
| Number of ratings | **35** | 1 |
| Positive reviews | 81.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Monetization | Free | Free |
| Size | 15 MB | 41 MB |
| Requires iOS | 12.1 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Michael Joe](https://appshunter.io/developer/1132486512) | [Peter Linszter](https://appshunter.io/developer/530077583) |

## What reviewers say

### e85Cal

[App page](https://appshunter.io/ios/app/e85cal/id1470313135)

This app assists users in calculating the precise amounts of standard and ethanol gasoline needed to achieve a desired ethanol percentage in their fuel mix. It simplifies the process by taking into account tank size, current fuel level, and the ethanol content of available fuel types.

**Highlights:** Calculate ethanol percentage goal, Enter gas tank size, Input standard pump gas ethanol %, Input ethanol pump gas ethanol %, Set target ethanol % mix, Enter current fuel level %

**Features:** macOS Compatibility

**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 e85Cal free?

e85Cal 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, e85Cal or KTuner FlexFuel?

KTuner FlexFuel is rated higher. e85Cal averages 4.7 out of 5 from 35 ratings, while KTuner FlexFuel averages 5.0 from 1 ratings.

### Do e85Cal or KTuner FlexFuel have ads?

Neither e85Cal nor KTuner FlexFuel shows ads.

### Which is updated more often, e85Cal or KTuner FlexFuel?

e85Cal ships an update every 4 months, and KTuner FlexFuel daily. Most recently, e85Cal was updated on July 23, 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.*