# e85Cal vs Knuckle Log

The clearest difference is in-app purchases: e85Cal at none against Knuckle Log's 3. e85Cal also leads on iOS requirement (12.1 vs 17.0). Knuckle Log's advantage is update cadence (weekly vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Knuckle Log sells 3 in-app purchases, starting at $24.99 per year. e85Cal asks for nothing beyond the download.

e85Cal ships an update every 4 months, Knuckle Log weekly. The most recent releases landed on September 26, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | e85Cal | Knuckle Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (35 ratings)](https://appshunter.io/ios/app/e85cal/id1470313135/reviews)** | — |
| Number of ratings | **35** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | Free | — |
| Size | 15 MB | 8 MB |
| Requires iOS | **12.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Michael Joe](https://appshunter.io/developer/1132486512) | [SCOTT DAVID DONALD KRELL](https://appshunter.io/developer/6792063393) |

## 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


### Knuckle Log

[App page](https://appshunter.io/ios/app/knuckle-log/id6792113792)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic | $24.99 | per year |
| Premium | $49.99 | per year |
| Buyer Report Unlock | $35.99 | one-time |


## Frequently asked questions

### Is e85Cal free?

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

### Is Knuckle Log free?

Knuckle Log is free to download, with in-app purchases available.

### Do e85Cal or Knuckle Log have ads?

Neither e85Cal nor Knuckle Log shows ads.

### Which is updated more often, e85Cal or Knuckle Log?

e85Cal ships an update every 4 months, and Knuckle Log weekly. Most recently, e85Cal was updated on September 26, 2026 and Knuckle Log on September 18, 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.*