# Average ISA Deviation vs Jeppesen Aviator

The clearest difference is review sentiment: Average ISA Deviation at 67% against Jeppesen Aviator's 0%. Jeppesen Aviator's advantage is price (Free vs $3.99) and rating (4.9 vs 3.5). On ads, in-app purchases and device support there is nothing between them.

Jeppesen Aviator is free to download; Average ISA Deviation costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Jeppesen Aviator holds the better App Store score, 4.9 against 3.5. That said, the two scores are not equally well evidenced: Jeppesen Aviator has 15 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 67% of Average ISA Deviation's written reviews are positive against 0% of Jeppesen Aviator's, so the app with the better star average is not the one people write more warmly about.

Average ISA Deviation ships an update every 14 months, Jeppesen Aviator every 3 months. The most recent releases landed on August 1, 2026 and August 27, 2026 respectively.

## The numbers

| Metric | Average ISA Deviation | Jeppesen Aviator |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/average-isa-deviation/id630933637/reviews) | **[4.9 (15 ratings)](https://appshunter.io/ios/app/jeppesen-aviator/id1135983832/reviews)** |
| Number of ratings | 2 | **15** |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 284 MB |
| Requires iOS | 26.1 | **16.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Juan Mauricio Padilla Villarreal](https://appshunter.io/developer/604279584) | [Jeppesen](https://appshunter.io/developer/382536359) |

## What reviewers say

### Average ISA Deviation

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

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


### Jeppesen Aviator

[App page](https://appshunter.io/ios/app/jeppesen-aviator/id1135983832)

This comprehensive flight management tool offers pilots a centralized hub for essential Electronic Flight Bag (EFB) functions. It streamlines workflows with configurable modules for briefings, navigation logs, documents, and performance data, integrating seamlessly with other aviation applications.

**Highlights:** Centralized EFB tools, Configurable dashboard module, Electronic briefing and navlog, Digital document viewer, Flight optimization, Device-to-device data sharing

**In-app purchases:** none


## Frequently asked questions

### Is Average ISA Deviation free?

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

### Is Jeppesen Aviator free?

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

### Which has better reviews, Average ISA Deviation or Jeppesen Aviator?

Jeppesen Aviator is rated higher. Average ISA Deviation averages 3.5 out of 5 from 2 ratings, while Jeppesen Aviator averages 4.9 from 15 ratings.

### Do Average ISA Deviation or Jeppesen Aviator have ads?

Neither Average ISA Deviation nor Jeppesen Aviator shows ads.

### Which is updated more often, Average ISA Deviation or Jeppesen Aviator?

Average ISA Deviation ships an update every 14 months, and Jeppesen Aviator every 3 months. Most recently, Average ISA Deviation was updated on August 1, 2026 and Jeppesen Aviator on August 27, 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.*