# E vs Fuel Density Calculation

The clearest difference is price: E at Free against Fuel Density Calculation's $2.99. E also leads on iOS requirement (13.0 vs 17.0). On rating, ratings volume, update cadence and ads there is nothing between them.

E is free to download; Fuel Density Calculation costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for E against 5.0 for Fuel Density Calculation. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

E ships an update every 3 months, Fuel Density Calculation every 2 months. The most recent releases landed on September 29, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | E | Fuel Density Calculation |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/e-force-sli/id6449679204/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/fuel-density-calculation/id6636469810/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 39 MB | 1 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Rescue Digital Systems Gmbh](https://appshunter.io/developer/1533789837) | [Richard Montoya](https://appshunter.io/developer/1762752434) |

## What reviewers say

### E

[App page](https://appshunter.io/ios/app/e-force-sli/id6449679204)

Access all your E-FORCE SLi battery rescue tools in one place. This application from GENESIS RESCUE SYSTEMS provides essential functionalities for managing and utilizing your rescue equipment.

**Highlights:** Battery rescue tool access, E-FORCE SLi system management, GENESIS RESCUE SYSTEMS tools, Integrated functionalities

**Features:** macOS Compatibility

**In-app purchases:** none


### Fuel Density Calculation

[App page](https://appshunter.io/ios/app/fuel-density-calculation/id6636469810)

This utility app assists wide-body aircrews, specifically for Boeing and Airbus aircraft, in comparing uploaded fuel quantities with actual fuel on board. It incorporates density calculations for accurate fuel management.

**Highlights:** Fuel density calculations, Compare uploaded vs. actual fuel, Designed for Boeing and Airbus aircrews, Accurate fuel on board (FOB) verification

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

**In-app purchases:** none


## Frequently asked questions

### Is E free?

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

### Is Fuel Density Calculation free?

Fuel Density Calculation costs $2.99, with no in-app purchases.

### Which has better reviews, E or Fuel Density Calculation?

E and Fuel Density Calculation are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do E or Fuel Density Calculation have ads?

Neither E nor Fuel Density Calculation shows ads.

### Which is updated more often, E or Fuel Density Calculation?

E ships an update every 3 months, and Fuel Density Calculation every 2 months. Most recently, E was updated on September 29, 2026 and Fuel Density Calculation on October 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.*