# Average ISA Deviation vs Navigraph Charts

The clearest difference is price: Navigraph Charts at Free against Average ISA Deviation's $3.99. Navigraph Charts also leads on rating (4.9 vs 3.5) and update cadence (monthly vs every 14 months). Average ISA Deviation's advantage is chart position (#164 vs unranked). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Navigraph Charts 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.

Navigraph Charts holds the better App Store score, 4.9 against 3.5. That said, the two scores are not equally well evidenced: Navigraph Charts has 2.8K ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 67% and 67% positive.

Average ISA Deviation ships an update every 14 months, Navigraph Charts monthly. The most recent releases landed on October 2, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Average ISA Deviation | Navigraph Charts |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/average-isa-deviation/id630933637/reviews) | **[4.9 (2.8K ratings)](https://appshunter.io/ios/app/navigraph-charts/id999805677/reviews)** |
| Number of ratings | 2 | **2.8K** |
| Positive reviews | 66.7% of reviews | **67.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#164** | — |
| Size | 1 MB | 94 MB |
| Requires iOS | 26.1 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Juan Mauricio Padilla Villarreal](https://appshunter.io/developer/604279584) | [Navigraph](https://appshunter.io/developer/999805676) |

## 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


### Navigraph Charts

[App page](https://appshunter.io/ios/app/navigraph-charts/id999805677)

This app provides comprehensive aviation charts and navigation data for flight simulation. It offers worldwide IFR and VFR chart coverage, updated regularly, and integrates seamlessly with popular flight simulators. Features include moving maps, weather overlays, and annotation tools to enhance the simulated flight experience.

**Highlights:** Jeppesen charts and navigation data, Worldwide IFR and VFR chart coverage, Regular 28-day AIRAC updates, Moving Maps, Weather overlays (radar, winds), 3D Globe Projection, Annotation tools

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Excellent navigation and flight planning features
- 🔒 Seamless integration with flight simulators
- 👍 Intuitive and user-friendly interface
- 🚀 Comprehensive database of charts and airport information
- 👍 Helpful for both VFR and IFR flying

**What reviewers complain about**

- 🐛 Frequent crashes and freezes after recent updates
- 🔋 High battery consumption on mobile devices
- 🔒 Requires a paid subscription to access full functionality
- 🐛 Occasional issues with weather data and chart rendering
- 🔒 Lack of offline mode for charts and data

**Reported bugs**

- Sim link not working consistently on some platforms
- Waypoint recognition issues when entering SIDs/STARs
- Occasional blank or missing chart displays
- Login problems after recent iOS updates

**Requested features**

- Add ability to draw and annotate on charts
- Improve integration with other flight planning tools like PFPX
- Implement live traffic overlay on charts
- Introduce VFR chart options
- Add more customization options for chart views


## Frequently asked questions

### Is Average ISA Deviation free?

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

### Is Navigraph Charts free?

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

### Which has better reviews, Average ISA Deviation or Navigraph Charts?

Navigraph Charts is rated higher. Average ISA Deviation averages 3.5 out of 5 from 2 ratings, while Navigraph Charts averages 4.9 from 2.8K ratings.

### Do Average ISA Deviation or Navigraph Charts have ads?

Neither Average ISA Deviation nor Navigraph Charts shows ads.

### Which is updated more often, Average ISA Deviation or Navigraph Charts?

Average ISA Deviation ships an update every 14 months, and Navigraph Charts monthly. Most recently, Average ISA Deviation was updated on October 2, 2026 and Navigraph Charts on October 13, 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.*