# E85 Calculator vs Spool Ethanol Analyzer

The clearest difference is rating: Spool Ethanol Analyzer at 4.1 against E85 Calculator's 1.0. Spool Ethanol Analyzer also leads on review sentiment (40% vs 25%) and update cadence (every 13 months vs every 29 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.

Spool Ethanol Analyzer holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: Spool Ethanol Analyzer has 14 ratings behind it against 2, 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 40% of Spool Ethanol Analyzer's.

E85 Calculator ships an update every 29 months, Spool Ethanol Analyzer every 13 months. The most recent releases landed on October 10, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | E85 Calculator | Spool Ethanol Analyzer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/e85-calculator/id1029273167/reviews) | **[4.1 (14 ratings)](https://appshunter.io/ios/app/spool-ethanol-analyzer/id1418992096/reviews)** |
| Number of ratings | 2 | **14** |
| Positive reviews | 25.0% of reviews | **40.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 13 months** |
| Monetization | Free | Free |
| Size | 3 MB | 9 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sheharyar Irfan](https://appshunter.io/developer/974971911) | [Ajay Rajeev](https://appshunter.io/developer/1418992095) |

## 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


### Spool Ethanol Analyzer

[App page](https://appshunter.io/ios/app/spool-ethanol-analyzer/id1418992096)

This application connects to a wireless sensor kit to measure in-tank ethanol content and fuel temperature. It also features a mixing ratio calculator that can be used independently of the sensor hardware.

**Highlights:** Connects to Spool Wireless Ethanol Sensor Kit, Measures in-tank ethanol content, Measures fuel temperature, Includes mixing ratio calculator, Uses Low energy Bluetooth protocols, Fast and reliable data

**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 Spool Ethanol Analyzer free?

Spool Ethanol Analyzer is free to download, with no in-app purchases.

### Which has better reviews, E85 Calculator or Spool Ethanol Analyzer?

Spool Ethanol Analyzer is rated higher. E85 Calculator averages 1.0 out of 5 from 2 ratings, while Spool Ethanol Analyzer averages 4.1 from 14 ratings.

### Do E85 Calculator or Spool Ethanol Analyzer have ads?

Neither E85 Calculator nor Spool Ethanol Analyzer shows ads.

### Which is updated more often, E85 Calculator or Spool Ethanol Analyzer?

E85 Calculator ships an update every 29 months, and Spool Ethanol Analyzer every 13 months. Most recently, E85 Calculator was updated on October 10, 2026 and Spool Ethanol Analyzer on October 4, 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.*