Comparison

Average ISA Deviation vs Navigraph Charts

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Average ISA Deviation

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
Currently charting
Read full description

Average ISA Deviation is a fast and precise utility designed for pro pilots who need to calculate the average ISA temperature deviation to correctly enter the DES FORECAST in the FMC of the Boeing 737 (NG / MAX) and other aircraft. The app allows you to: • Quickly calculate the average ISA deviation • Reduce workload and potential errors during descent planning • Simplify calculations that are normally done manually • Work fully offline, ideal for cockpit use Designed by a pilot, for pilots. Legal Disclaimer This application is intended as an advisory and informational tool only. It does not replace official aeronautical charts, flight planning systems, company procedures, or regulatory guidance.

About

Navigraph Charts

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
Read full description

Looking for the most comprehensive software solution for flight simulation? Navigraph Charts is your co-pilot. Navigraph Charts 8 has been developed with emphasis on delivering a seamless and intuitive experience, reducing the pilot workload in all phases of the simulated flight. Why you'll always want Navigraph Charts with you in the cockpit: - Only provider of Jeppesen charts and navigation data for flight simulation. - Access to IFR chart coverage at over 7,000 airports worldwide. - Charts and data sourced from Jeppesen and updated every 28 days according to the AIRAC calendar. - Largest dataset of its kind in the world. - Most up-to-date and modern navigation software for flight simulation. - Simulator sceneries, flight plans, charts, navigation systems, and addon software are all in sync with data from the same source. - Great support. New features in Navigraph Charts 8: - Worldwide VFR Charts powered by Jeppesen VFR data - Seamless Zoom - 3D Globe Projection - Autopinning of Procedure Charts - Runway Crosswind and Airport Weather Information - Vector Charts - Weather overlays including radar and winds - ATIS - NOTAM - Annotate and draw on charts and SimBrief operational flight plan - VATSIM and IVAO traffic and ATC sector display Navigraph Unlimited features: - Moving Maps - Zoom all the way down to gate level. - 3D globe projection helps visualize Great Circle distances and polar routes. - Saves time and effort by automatically organizing relevant airport charts to pinboard. - Weather information including runway crosswinds updated in real-time. - No commitment - cancel any time you like. Moving Maps compatible with Microsoft Flight Simulator, X-Plane and Prepar3d.

Screenshots

Average ISA Deviation2 screens
Navigraph Charts4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 4 level
Average ISA Deviation versus Navigraph Charts: the parameters behind the verdict, then further details
ParameterAverage ISA DeviationNavigraph Charts
Price$3.99Free — better
Rating3.5 (2 ratings)4.9 (2.8K ratings) — better
Positive reviews66.7% of reviews67.0% of reviews — better
Number of ratings22.8K — better
Update frequencyEvery 14 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree with in-app purchases — better
Best chart rank#164 — better—
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.116.4 — better
Further details — not scored
Size1 MB94 MB
Age rating4+4+
DeveloperJuan Mauricio Padilla VillarrealNavigraph

Customer experience

Average ISA Deviation

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Navigraph Charts

All ratings2,783 ratings
Positive98.5%
Neutral0.4%
Negative1.1%
Written reviews112 reviews
Positive67.0%
Neutral3.6%
Negative29.5%

Bugs and requests

Average ISA Deviation

Not enough reviews yet to summarise bugs or requests.

Navigraph Charts

Reported bugs

4 issues
  • 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

5 requests
  • 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

In-app purchases

None

Average ISA Deviation

No in-app purchases

None

Navigraph Charts

No in-app purchases

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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