# e85Cal vs BuildSpec

The clearest difference is rating: BuildSpec at 5.0 against e85Cal's 4.7. BuildSpec also leads on review sentiment (100% vs 83%). e85Cal's advantage is ratings volume (37 vs 1) and iOS requirement (12.1 vs 17.6). On price, update cadence, 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.

BuildSpec holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: e85Cal has 37 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 83% of e85Cal's written reviews are positive against 100% of BuildSpec's.

e85Cal ships an update every 4 months, BuildSpec every 3 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | e85Cal | BuildSpec |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (37 ratings)](https://appshunter.io/ios/app/e85cal/id1470313135/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/buildspec-car-builds/id6758304475/reviews)** |
| Number of ratings | **37** | 1 |
| Positive reviews | 83.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 15 MB | 11 MB |
| Requires iOS | **12.1** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Michael Joe](https://appshunter.io/developer/1132486512) | [Grant Johnson](https://appshunter.io/developer/1866959368) |

## 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


### BuildSpec

[App page](https://appshunter.io/ios/app/buildspec-car-builds/id6758304475)

Easily track, organize, and showcase your car modification projects. Log parts, costs, and installation details for multiple vehicles in a structured, searchable garage. Designed for car builders and modifiers to maintain a complete build history.

**Highlights:** Track modifications and parts, Log costs and installation details, Maintain build history, Create multiple vehicle profiles, Store specifications and photos, Organized garage dashboard

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is e85Cal free?

e85Cal is free to download, with no in-app purchases.

### Is BuildSpec free?

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

### Which has better reviews, e85Cal or BuildSpec?

BuildSpec is rated higher. e85Cal averages 4.7 out of 5 from 37 ratings, while BuildSpec averages 5.0 from 1 ratings.

### Do e85Cal or BuildSpec have ads?

Neither e85Cal nor BuildSpec shows ads.

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

e85Cal ships an update every 4 months, and BuildSpec every 3 months. Most recently, e85Cal was updated on November 3, 2026 and BuildSpec on November 5, 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.*