Average ISA Deviation vs INSTGPS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Calculate average ISA deviation
- Reduce descent planning workload
- Simplify manual calculations
- Offline cockpit use
- Designed by a pilot
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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.
INSTGPS
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App INSTPS para gestión de flotas
Screenshots
Verdict
The clearest difference is price: INSTGPS at Free against Average ISA Deviation's $3.99. INSTGPS also leads on iOS requirement (17.0 vs 26.1). On update cadence, 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
INSTGPS 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.
Average ISA Deviation ships an update every 14 months, INSTGPS every 10 months. The most recent releases landed on August 1, 2026 and September 7, 2026 respectively.
| Parameter | Average ISA Deviation | INSTGPS |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 3.5 (2 ratings) — better | — |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 14 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.1 | 17.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 119 MB |
| Age rating | 4+ | 4+ |
| Developer | Juan Mauricio Padilla Villarreal | Daniel Roberto Barraza Cota |
In-app purchases
Average ISA Deviation
No in-app purchases
INSTGPS
No in-app purchases
