Ethanol Calculator vs passwhistle
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ethanol Calculator
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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.
passwhistle
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Verdict
The clearest difference is price: passwhistle at Free against Ethanol Calculator's $9.99. Ethanol Calculator's advantage is update cadence (every 9 days vs every 2 months). On ads, in-app purchases, device support and iOS requirement 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
passwhistle is free to download; Ethanol Calculator costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Ethanol Calculator ships an update every 9 days, passwhistle every 2 months. Both last shipped on October 24, 2026.
| Parameter | Ethanol Calculator | passwhistle |
|---|---|---|
| Price | $9.99 | Free — better |
| Update frequency | Every 9 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 10 MB | 41 MB |
| Age rating | 17+ | 4+ |
| Developer | MOSTUNED LTD | KAM INOVASYON BILISIM REKLAMCILIK A.S. |
In-app purchases
Ethanol Calculator
No in-app purchases
passwhistle
No in-app purchases
Questions
Is Ethanol Calculator free?
Is passwhistle free?
Do Ethanol Calculator or passwhistle have ads?
Which is updated more often, Ethanol Calculator or passwhistle?
Other comparisons
