# Cost Index vs ACN/PCN Calculator

The clearest difference is in-app purchases: Cost Index at none against ACN/PCN Calculator's 10. Cost Index also leads on rating (5.0 vs 4.6) and iOS requirement (8.0 vs 17.6). ACN/PCN Calculator's advantage is update cadence (every 2 months vs every 16 months) and ratings volume (144 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. ACN/PCN Calculator sells 10 one-off in-app purchases. Cost Index asks for nothing beyond the download.

Cost Index holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: ACN/PCN Calculator has 144 ratings behind it against 1, so its average is the more settled of the two.

Cost Index ships an update every 16 months, ACN/PCN Calculator every 2 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Cost Index | ACN/PCN Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cost-index/id671845599/reviews)** | [4.6 (144 ratings)](https://appshunter.io/ios/app/acnpcn-calculator/id1049063069/reviews) |
| Number of ratings | 1 | **144** |
| Positive reviews | — | 45.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 4 MB |
| Requires iOS | **8.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Flight Efficiency Limited](https://appshunter.io/developer/466443228) | [AeroKitPro LLC](https://appshunter.io/developer/1049063068) |

## 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


### ACN/PCN Calculator

[App page](https://appshunter.io/ios/app/acnpcn-calculator/id1049063069)

This app calculates aircraft pavement classification numbers (PCN) and aircraft classification numbers (ACN) to assess airport pavement strength. It helps pilots and aviation professionals ensure safe operations by verifying aircraft weight limitations on runways, taxiways, and aprons.

**Highlights:** ACN/PCN calculation, Pavement strength evaluation, Aircraft weight verification, ICAO ACN/PCN method, Comprehensive aircraft database, User-friendly interface

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| G600 (41.7t) | Free | one-time |
| G650 (45.3t) | $4.99 | one-time |
| Global 5000 GVFD (42.0t) | $4.99 | one-time |
| Global 6000 (45.2t) | $4.99 | one-time |
| G650ER (47.1t) | $4.99 | one-time |
| G550 (41.4t) | $4.99 | one-time |
| G450 (33.7t) | $4.99 | one-time |
| G280 (18.0t) | $4.99 | one-time |
| Global 7500 (52.2t) | $4.99 | one-time |
| FALCON 7X (31.8t) | $4.99 | one-time |


## Frequently asked questions

### Is Cost Index free?

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

### Is ACN/PCN Calculator free?

ACN/PCN Calculator is free to download, with in-app purchases available.

### Which has better reviews, Cost Index or ACN/PCN Calculator?

Cost Index is rated higher. Cost Index averages 5.0 out of 5 from 1 ratings, while ACN/PCN Calculator averages 4.6 from 144 ratings.

### Do Cost Index or ACN/PCN Calculator have ads?

Neither Cost Index nor ACN/PCN Calculator shows ads.

### Which is updated more often, Cost Index or ACN/PCN Calculator?

Cost Index ships an update every 16 months, and ACN/PCN Calculator every 2 months. Most recently, Cost Index was updated on November 1, 2026 and ACN/PCN Calculator on November 6, 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.*