Comparison

KM eFlash vs Ethanol Calculator

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

KM eFlash

Features
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KM eFlash makes vehicle diagnostics and ECU programming simple and efficient. Use the specially developed KM eFlash OBD2 dongle directly from your smartphone to: * Read, analyze, and clear diagnostic trouble codes (DTCs) * Flash engine and transmission control units * Display and record real-time telemetry data The connection is established conveniently via Wi-Fi, ensuring fast and reliable data transmission. The app can only be used with the KM eFlash OBD2 dongle and a valid user account. For more information, visit: https://www.km-tuning.com

About

Ethanol Calculator

Features
Read full description

Ethanol Calculator helps you determine exactly how much pure ethanol to add to your fuel tank to reach your desired ethanol ratio. KEY FEATURES: - Fill Tank mode: enter the total you want and see exactly how much E85 and gas to pump - Mix with E85 or a custom blend, not only pure ethanol - Liters, US gallons and UK gallons - Calculate required ethanol amount instantly - Preset buttons for E10, E20, E25, E30, E50, E85 - Buying gas too? Enter it and still hit your target - Real-time results as you adjust sliders - Dark & Light mode support - Available in 30 languages PERFECT FOR: - Flex fuel vehicle owners - E85 enthusiasts & tuners - Race fuel blending - Biofuel mixing calculations Simply enter your current fuel amount, current ethanol percentage, and target ethanol percentage. The app instantly calculates how much pure ethanol you need to add. Buying gas as well? Enter how much and the app tells you how much ethanol to add on top to land exactly on your target blend. Note: Calculations are based on mathematical formulas using 100% pure ethanol as reference.

Screenshots

KM eFlash4 screens
Ethanol Calculator4 screens

Verdict

The call

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.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences ยท 4 level
KM eFlash versus Ethanol Calculator: the parameters behind the verdict, then further details
ParameterKM eFlashEthanol Calculator
PriceFree โ€” better$9.99
Update frequencyEvery 3 days โ€” betterEvery 9 days
AdsNoNo
In-app purchasesNoNo
DevicesiPhoneiPhone, iPad โ€” better
Requires iOS16.416.0 โ€” better
Further details โ€” not scored
Size52 MB10 MB
Age rating4+17+
DeveloperKM Engineers GmbHMOSTUNED LTD

In-app purchases

None

KM eFlash

No in-app purchases

None

Ethanol Calculator

No in-app purchases

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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