# E85 Calculator vs eFlexApp

The clearest difference is rating: eFlexApp at 3.2 against E85 Calculator's 1.0. eFlexApp also leads on update cadence (monthly vs every 29 months) and ratings volume (10 vs 2). E85 Calculator's advantage is iOS requirement (16.0 vs 26.6). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

eFlexApp holds the better App Store score, 3.2 against 1.0. That said, the two scores are not equally well evidenced: eFlexApp has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 25% and 25% positive.

E85 Calculator ships an update every 29 months, eFlexApp monthly. The most recent releases landed on October 10, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | E85 Calculator | eFlexApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/e85-calculator/id1029273167/reviews) | **[3.2 (10 ratings)](https://appshunter.io/ios/app/eflexapp/id1526677191/reviews)** |
| Number of ratings | 2 | **10** |
| Positive reviews | 25.0% of reviews | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Monthly** |
| Monetization | Free | Free |
| Size | 3 MB | 53 MB |
| Requires iOS | **16.0** | 26.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sheharyar Irfan](https://appshunter.io/developer/974971911) | [StepOne Tech Ltd](https://appshunter.io/developer/1388519134) |

## What reviewers say

### E85 Calculator

[App page](https://appshunter.io/ios/app/e85-calculator/id1029273167)

This application helps performance enthusiasts and flex-fuel vehicle owners precisely calculate the amounts of E85 and gasoline needed for specific ethanol percentages or octane ratings. It offers both simple and advanced modes for fuel mixing calculations, supporting metric and imperial units.

**Highlights:** Calculate E85 and gasoline amounts, Target specific ethanol percentages, Calculate by desired octane rating, Metric and imperial unit support, Real-time calculations, Easy and advanced modes

**Features:** macOS Compatibility

**In-app purchases:** none


### eFlexApp

[App page](https://appshunter.io/ios/app/eflexapp/id1526677191)

Monitor your eFlexFuel device in real-time, with features varying by device version. Adjust settings like language, temperature units, and theme. Track ethanol content, engine temperature, and more, depending on your specific eFlexFuel model.

**Highlights:** Real-time device monitoring, Adjustable settings (language, temp, theme), Ethanol content tracking, Engine temperature monitoring, Device status checks, Bluetooth connectivity

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is E85 Calculator free?

E85 Calculator is free to download, with no in-app purchases.

### Is eFlexApp free?

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

### Which has better reviews, E85 Calculator or eFlexApp?

eFlexApp is rated higher. E85 Calculator averages 1.0 out of 5 from 2 ratings, while eFlexApp averages 3.2 from 10 ratings.

### Do E85 Calculator or eFlexApp have ads?

Neither E85 Calculator nor eFlexApp shows ads.

### Which is updated more often, E85 Calculator or eFlexApp?

E85 Calculator ships an update every 29 months, and eFlexApp monthly. Most recently, E85 Calculator was updated on October 10, 2026 and eFlexApp on October 17, 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.*