# Cost Index vs Simple Flight App

The clearest difference is in-app purchases: Cost Index at none against Simple Flight App's 3. Cost Index also leads on iOS requirement (8.0 vs 15.6). Simple Flight App's advantage is update cadence (every 3 weeks vs every 16 months). On price, ads and device support there is nothing between them.

Both are free to download. Simple Flight App sells 3 in-app purchases, starting at $4.99 per month. Cost Index asks for nothing beyond the download.

Cost Index ships an update every 16 months, Simple Flight App every 3 weeks. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Cost Index | Simple Flight App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cost-index/id671845599/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 65 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Flight Efficiency Limited](https://appshunter.io/developer/466443228) | [SIMPLE FLIGHT TECNOLOGIA DA INFORMACAO LTDA](https://appshunter.io/developer/1602377818) |

## 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


### Simple Flight App

[App page](https://appshunter.io/ios/app/simple-flight-app/id1602377816)

Manage aviation expenses, track costs, and split bills with partners. Easily record expenses, reimbursements, and monitor critical expiration dates. Export all your data in PDF format for efficient record-keeping.

**Highlights:** Cost management, Expense tracking, Cost sharing, Expiration date tracking, PDF data export, Aircraft and shared cost viewing

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plano Premium Simple Flight | $4.99 | per month |
| Business Plan | $5.99 | per month |
| Business | $99.99 | per month |


## Frequently asked questions

### Is Cost Index free?

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

### Is Simple Flight App free?

Simple Flight App is free to download, with in-app purchases available.

### Do Cost Index or Simple Flight App have ads?

Neither Cost Index nor Simple Flight App shows ads.

### Which is updated more often, Cost Index or Simple Flight App?

Cost Index ships an update every 16 months, and Simple Flight App every 3 weeks. Most recently, Cost Index was updated on October 6, 2026 and Simple Flight App on October 7, 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.*