# e85Cal vs eFlexApp

The clearest difference is review sentiment: e85Cal at 82% against eFlexApp's 33%. e85Cal also leads on rating (4.7 vs 3.4) and ratings volume (35 vs 8). eFlexApp's advantage is update cadence (monthly vs every 4 months). 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.

e85Cal holds the better App Store score, 4.7 against 3.4. Both are backed by a comparable volume of ratings — 35 and 8 respectively. Written reviews point the same way: 82% of e85Cal's written reviews are positive against 33% of eFlexApp's.

e85Cal ships an update every 4 months, eFlexApp monthly. The most recent releases landed on July 23, 2026 and July 9, 2026 respectively.

## The numbers

| Metric | e85Cal | eFlexApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (35 ratings)](https://appshunter.io/ios/app/e85cal/id1470313135/reviews)** | [3.4 (8 ratings)](https://appshunter.io/ios/app/eflexapp/id1526677191/reviews) |
| Number of ratings | **35** | 8 |
| Positive reviews | **81.8% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free | Free |
| Size | 15 MB | 58 MB |
| Requires iOS | **12.1** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Michael Joe](https://appshunter.io/developer/1132486512) | [StepOne Tech Ltd](https://appshunter.io/developer/1388519134) |

## 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


### 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

**In-app purchases:** none


## Frequently asked questions

### Is e85Cal free?

e85Cal 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, e85Cal or eFlexApp?

e85Cal is rated higher. e85Cal averages 4.7 out of 5 from 35 ratings, while eFlexApp averages 3.4 from 8 ratings.

### Do e85Cal or eFlexApp have ads?

Neither e85Cal nor eFlexApp shows ads.

### Which is updated more often, e85Cal or eFlexApp?

e85Cal ships an update every 4 months, and eFlexApp monthly. Most recently, e85Cal was updated on July 23, 2026 and eFlexApp on July 9, 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.*