# Average ISA Deviation vs ISA Deviation Calculator

The clearest difference is iOS requirement: ISA Deviation Calculator at 15.1 against Average ISA Deviation's 26.1. On price, ads, in-app purchases and chart position there is nothing between them.

Average ISA Deviation costs $3.99 and ISA Deviation Calculator $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Average ISA Deviation | ISA Deviation Calculator |
| --- | --- | --- |
| Price | $3.99 | $3.99 |
| Rating | **[3.5 (2 ratings)](https://appshunter.io/ios/app/average-isa-deviation/id630933637/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | — |
| Monetization | Paid | — |
| Best chart rank | #164 | **#79** |
| Size | 1 MB | 32 MB |
| Requires iOS | 26.1 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Juan Mauricio Padilla Villarreal](https://appshunter.io/developer/604279584) | [Omar Mando Pol](https://appshunter.io/developer/1895425536) |

## What reviewers say

### Average ISA Deviation

[App page](https://appshunter.io/ios/app/average-isa-deviation/id630933637)

**Currently charting:** #164 Top Paid · Navigation (US App Store)

This utility helps professional pilots quickly calculate average ISA temperature deviation for descent planning on specific aircraft models. It simplifies manual calculations, reduces workload, and operates offline, making it ideal for cockpit use.

**Highlights:** Calculate average ISA deviation, Reduce descent planning workload, Simplify manual calculations, Offline cockpit use, Designed by a pilot

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

**In-app purchases:** none


### ISA Deviation Calculator

[App page](https://appshunter.io/ios/app/isa-deviation-calculator/id6763664276)

**Currently charting:** #79 Top Paid · Navigation (US App Store)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Average ISA Deviation free?

Average ISA Deviation costs $3.99, with no in-app purchases.

### Is ISA Deviation Calculator free?

ISA Deviation Calculator costs $3.99, with no in-app purchases.

### Do Average ISA Deviation or ISA Deviation Calculator have ads?

Neither Average ISA Deviation nor ISA Deviation Calculator shows ads.

### Which is more popular, Average ISA Deviation or ISA Deviation Calculator?

Average ISA Deviation currently peaks at #164 in the App Store charts, and ISA Deviation Calculator at #79. Chart position reflects recent download velocity rather than total install base.

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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.*