# E85 Calculator vs PROFLEX Connect

The clearest difference is rating: PROFLEX Connect at 2.8 against E85 Calculator's 1.0. PROFLEX Connect also leads on update cadence (weekly vs every 29 months) and ratings volume (56 vs 1). 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.

PROFLEX Connect holds the better App Store score, 2.8 against 1.0. That said, the two scores are not equally well evidenced: PROFLEX Connect has 56 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 25% of E85 Calculator's written reviews are positive against 38% of PROFLEX Connect's.

E85 Calculator ships an update every 29 months, PROFLEX Connect weekly. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | E85 Calculator | PROFLEX Connect |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/e85-calculator/id1029273167/reviews) | **[2.8 (56 ratings)](https://appshunter.io/ios/app/proflex-connect/id1262287275/reviews)** |
| Number of ratings | 1 | **56** |
| Positive reviews | 25.0% of reviews | **37.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Weekly** |
| Monetization | Free | Free |
| Size | 3 MB | 22 MB |
| Requires iOS | 16.0 | **12.4** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sheharyar Irfan](https://appshunter.io/developer/974971911) | [ADVANCED FUEL DYNAMICS](https://appshunter.io/developer/1564136309) |

## 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


### PROFLEX Connect

[App page](https://appshunter.io/ios/app/proflex-connect/id1262287275)

This app allows you to monitor your vehicle's fuel system performance in real-time. It displays device settings and helps locate nearby E85 fuel stations for convenient ethanol blending.

**Highlights:** Real-time device setting display, E85 station locator, Fuel ratio monitoring, Performance flex fuel system integration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is E85 Calculator free?

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

### Is PROFLEX Connect free?

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

### Which has better reviews, E85 Calculator or PROFLEX Connect?

PROFLEX Connect is rated higher. E85 Calculator averages 1.0 out of 5 from 1 ratings, while PROFLEX Connect averages 2.8 from 56 ratings.

### Do E85 Calculator or PROFLEX Connect have ads?

Neither E85 Calculator nor PROFLEX Connect shows ads.

### Which is updated more often, E85 Calculator or PROFLEX Connect?

E85 Calculator ships an update every 29 months, and PROFLEX Connect weekly. Most recently, E85 Calculator was updated on November 1, 2026 and PROFLEX Connect on November 2, 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.*