# KM eFlash vs Ethanol Calculator

The clearest difference is price: KM eFlash at Free against Ethanol Calculator's $9.99. KM eFlash also leads on update cadence (every 3 days vs every 9 days). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

KM eFlash is free to download; Ethanol Calculator costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

KM eFlash ships an update every 3 days, Ethanol Calculator every 9 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | KM eFlash | Ethanol Calculator |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 9 days |
| Size | 52 MB | 10 MB |
| Requires iOS | 16.4 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [KM Engineers GmbH](https://appshunter.io/developer/1799146204) | [MOSTUNED LTD](https://appshunter.io/developer/6814598013) |

## What reviewers say

### KM eFlash

[App page](https://appshunter.io/ios/app/km-eflash/id6742645180)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ethanol Calculator

[App page](https://appshunter.io/ios/app/ethanol-calculator-e85-fuel/id6757930343)

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

**In-app purchases:** none


## Frequently asked questions

### Is KM eFlash free?

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

### Is Ethanol Calculator free?

Ethanol Calculator costs $9.99, with no in-app purchases.

### Do KM eFlash or Ethanol Calculator have ads?

Neither KM eFlash nor Ethanol Calculator shows ads.

### Which is updated more often, KM eFlash or Ethanol Calculator?

KM eFlash ships an update every 3 days, and Ethanol Calculator every 9 days. Most recently, KM eFlash was updated on October 25, 2026 and Ethanol Calculator 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.*