TruAirspeed vs SwitcheOn
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).
SwitcheOn
Control your power outlets and thermostat remotely. Features include multi-channel power control with temperature sensing and automations. It also offers advanced thermostat functionality for various HVAC systems.
- Remote power control (2 or 4 channels)
- Temperature sensor and OLED display
- Time and temperature automations
- Thermostat for HVAC systems
- Multi-stage fan and heat source control
- Easy programming for schedules
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Remote power control and thermostat that Just Works Power Control: *2 or 4 channels and up to 15 amps (1800 watts) *Temperature sensor *Bright OLED display *Local and ZULU time *Automations (Time,temperature minimum/maximum) for each channel Thermostat: * Works with most residential, commercial and RV HVAC systems * 6 outputs to control multi-stage fans, compressors and multiple heat sources * Easy programming for day, time, or day of week
Screenshots
Verdict
The clearest difference is update cadence: SwitcheOn at every 2 months against TruAirspeed's every 24 months. SwitcheOn also leads on rating (4.5 vs 4.1) and review sentiment (80% vs 71%). TruAirspeed's advantage is monetization model (free vs ad-supported). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
SwitcheOn holds the better App Store score, 4.5 against 4.1. Both are backed by a comparable volume of ratings — 8 and 30 respectively. Written reviews point the same way: 71% of TruAirspeed's written reviews are positive against 80% of SwitcheOn's.
TruAirspeed ships an update every 24 months, SwitcheOn every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | TruAirspeed | SwitcheOn |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (8 ratings) | 4.5 (30 ratings) — better |
| Positive reviews | 71.4% of reviews | 80.0% of reviews — better |
| Number of ratings | 8 | 30 — better |
| Update frequency | Every 24 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 93 MB |
| Age rating | 4+ | 4+ |
| Developer | James Petty | Malmoset, LLC |
Customer experience
TruAirspeed
SwitcheOn
In-app purchases
TruAirspeed
No in-app purchases
SwitcheOn
No in-app purchases
Questions
Is TruAirspeed free?
Is SwitcheOn free?
Which has better reviews, TruAirspeed or SwitcheOn?
Do TruAirspeed or SwitcheOn have ads?
Which is updated more often, TruAirspeed or SwitcheOn?
Other comparisons
