NormalClock vs TruAirspeed
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NormalClock
This utility app functions as a basic clock with alarm features. It allows customization of alarm sounds using iPod library tunes and includes a screen burn-in prevention mechanism by slightly shifting the clock's position.
- Customizable alarm sounds
- iPod library integration for alarm tunes
- Screen burn-in prevention
- Alarm on/off functionality
- Alarm time setting
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It is a normal clock. There is a shadow on the clock hand. Alarm on/off pushes the icon. The alarm time setting begins the drug from the clock center. Alarm stop pushes the icon. Please push the power supply button after pushing the home button when you erase the screen after the alarm is set. The alarm sound can be set according to an arbitrary number of seconds for an arbitrary iPod library tune. ( The correspondence music file is only AAC(.m4a) and MP3 of 44.1k and stereo file. AAC file is quick.alarm sound is 60 sec. ) Please do not erase the application with the alarm set. The alarm is not stopped. It is by design that the clock position has moved slightly to prevent screen burn-in. However, please note that this does not completely prevent burn-in.
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).
Screenshots
Verdict
The clearest difference is price: TruAirspeed at Free against NormalClock's $0.99. TruAirspeed also leads on rating (4.1 vs 1.0) and review sentiment (71% vs 50%). NormalClock's advantage is update cadence (every 10 months vs every 24 months). On ads, in-app purchases, device support and iOS requirement 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; NormalClock costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
TruAirspeed holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: TruAirspeed has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of NormalClock's written reviews are positive against 71% of TruAirspeed's.
NormalClock ships an update every 10 months, TruAirspeed every 24 months. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.
| Parameter | NormalClock | TruAirspeed |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 1.0 (1 ratings) | 4.1 (8 ratings) — better |
| Positive reviews | 50.0% of reviews | 71.4% of reviews — better |
| Number of ratings | 1 | 8 — better |
| Update frequency | Every 10 months — better | Every 24 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 3 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | r2r660cc | James Petty |
Customer experience
NormalClock
TruAirspeed
In-app purchases
NormalClock
No in-app purchases
TruAirspeed
No in-app purchases
Questions
Is NormalClock free?
Is TruAirspeed free?
Which has better reviews, NormalClock or TruAirspeed?
Do NormalClock or TruAirspeed have ads?
Which is updated more often, NormalClock or TruAirspeed?
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