TruAirspeed vs Diamond ECL
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TruAirspeed
This utility calculates true airspeed, pressure altitude, density altitude, and Mach number. It accounts for compressibility effects and offers unit choices and keypad styles. Users can also input a correction factor for their airspeed indicator.
- True airspeed calculation
- Pressure and density altitude calculation
- Mach number calculation
- Compressibility effects accounted for
- Choice of input/result units
- Calculator or telephone keypad options
- Airspeed indicator correction factor
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TruAirspeed is a True Airspeed Calculator for the iPhone and iPad. It's a bit different from other true airspeed calculators, in which the pressure altitude is an input. This requires resetting the altimeter to the standard sea level pressure of 29.92"Hg to read the pressure altitude. With TruAirspeed, you input the indicated altitude and the Kollsman window's pressure setting — the app then calculates the pressure altitude, density altitude, true airspeed and mach number for you. The calculations involved take full account of compressibility effects, but not shock waves, so it's limited to subsonic, non-transonic flight only. You have a choice of units for inputs and results, and you may choose either a calculator-style keypad (top row: 7-8-9) or a telephone-style keypad (top row: 1-2-3). You may also set a correction factor for your bird's airspeed indicator/pitot-static system, if you know it (mine is 0.95).
Diamond ECL
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This is an electronic checklists app for Diamond Da-40/42NG aircraft.
Screenshots
Verdict
The clearest difference is price: TruAirspeed at Free against Diamond ECL's $1.99. TruAirspeed also leads on iOS requirement (15.6 vs 17). Diamond ECL's advantage is update cadence (every 2 months vs every 24 months). On 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
TruAirspeed is free to download; Diamond ECL costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
TruAirspeed ships an update every 24 months, Diamond ECL every 2 months. The most recent releases landed on October 2, 2026 and September 27, 2026 respectively.
| Parameter | TruAirspeed | Diamond ECL |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.1 (8 ratings) — better | — |
| Positive reviews | 71.4% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 24 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17 |
| Further details — not scored | ||
| Size | 8 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | James Petty | Gadir Mamedov |
In-app purchases
TruAirspeed
No in-app purchases
Diamond ECL
No in-app purchases
Questions
Is TruAirspeed free?
Is Diamond ECL free?
Do TruAirspeed or Diamond ECL have ads?
Which is updated more often, TruAirspeed or Diamond ECL?
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