# Cost Index vs E

The clearest difference is rating: Cost Index at 5.0 against E's 3.3. Cost Index also leads on iOS requirement (8.0 vs 14.0). E's advantage is update cadence (every 4 months vs every 16 months) and ratings volume (4 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.

Cost Index holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

Cost Index ships an update every 16 months, E every 4 months. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Cost Index | E |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cost-index/id671845599/reviews)** | [3.3 (4 ratings)](https://appshunter.io/ios/app/e-jets-training-guide-lite/id1071733240/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 3 MB | 536 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flight Efficiency Limited](https://appshunter.io/developer/466443228) | [Jorge Gonzalez Galvan](https://appshunter.io/developer/915982572) |

## What reviewers say

### Cost Index

[App page](https://appshunter.io/ios/app/cost-index/id671845599)

This app helps airline and corporate aircraft operators achieve significant operational savings by calculating the optimum cruise speed for flights based on pilot-inputted conditions and aircraft-specific data. It offers advanced features for cost, fuel, and time optimization, including level change analysis and turbulence margin adjustments.

**Highlights:** Optimum cruise speed calculation, Customizable operational data display, Minimum fuel burn speed for long range, Turbulence margin adjustment, Level change analysis for climb/descent decisions, Automated data updates

**Features:** macOS Compatibility

**In-app purchases:** none


### E

[App page](https://appshunter.io/ios/app/e-jets-training-guide-lite/id1071733240)

This pilot training tool offers a comprehensive knowledge base for E-JET aircraft systems and procedures, based on official manuals. It features interactive diagrams, extensive question banks, and a fast search engine to help pilots stay current and improve their skills.

**Highlights:** Interactive electrical diagram, Extensive question banks with explanations, Fast search engine for definitions and abbreviations, Virtual interactive panel with system pages, Unit fast converter, Dark mode enabled

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

**In-app purchases:** none


## Frequently asked questions

### Is Cost Index free?

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

### Is E free?

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

### Which has better reviews, Cost Index or E?

Cost Index is rated higher. Cost Index averages 5.0 out of 5 from 1 ratings, while E averages 3.3 from 4 ratings.

### Do Cost Index or E have ads?

Neither Cost Index nor E shows ads.

### Which is updated more often, Cost Index or E?

Cost Index ships an update every 16 months, and E every 4 months. Most recently, Cost Index was updated on October 6, 2026 and E on October 12, 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.*