Comparison

TruAirspeed vs SMIDIG

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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).

About

SMIDIG

This app facilitates sharing, renting, and vending of items through smart lockers. It enables click-and-collect services, peer-to-peer exchanges, and on-demand asset rental or sales.

Highlights
  • Click and Collect services
  • Person-to-person item sharing
  • Sharing with payment for repairs
  • On-demand asset renting
  • Subscription-based asset access
  • On-demand storage rental
  • Instant item vending via QR code
Features
Read full description

SMIDIG ( Sharing , Renting , Vending) How Does SMIDIG Work? SHARING - Click and Collect : Where customer orders an item and retailer place their order in the box by assigning access to them. - Person to Person Sharing : This could be an ideal in apartments where keys/tools/gadgets etc can be exchanged with others by placing in the box and give other access. - Sharing with payment : It is an ideal for repair businesses , where they can repair items and place in the box and item owners can pick items by paying outstanding amount. It is an ideal for cellphone/computer/mobility repair industry RENTING - Asset on demand : Place an item in the box , set the duration and price. - Asset as a Subscription : Offer membership possibilities to customers , they can pay once in month and use asset(s) based on their needs. - Storage on demand : Users can rent storage like lockers for certain duration. It is an ideal for cafe, co-working spaces. VENDING - Sell Anything Anywhere Anytime : Place an item or bunch of items in the box . Set a price on that box. Customer can buy instantly by scanning QR code. Visit https://www.shrvee.com/ to know more and connect with us.

Screenshots

TruAirspeed4 screens
SMIDIG4 screens

Verdict

The call

The clearest difference is rating: SMIDIG at 5.0 against TruAirspeed's 4.1. SMIDIG also leads on update cadence (fortnightly vs every 24 months) and iOS requirement (13.0 vs 15.6). TruAirspeed's advantage is ratings volume (8 vs 1). On price, ads, in-app purchases and monetization model 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

SMIDIG holds the better App Store score, 5.0 against 4.1. 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.

UpkeepUpdate frequency

TruAirspeed ships an update every 24 months, SMIDIG fortnightly. The most recent releases landed on October 23, 2026 and October 6, 2026 respectively.

Scorecard4 real differences · 6 level
TruAirspeed versus SMIDIG: the parameters behind the verdict, then further details
ParameterTruAirspeedSMIDIG
PriceFreeFree
Rating4.1 (8 ratings)5.0 (1 ratings) — better
Positive reviews71.4% of reviews—
Number of ratings8 — better1
Update frequencyEvery 24 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size8 MB54 MB
Age rating4+4+
DeveloperJames PettyAZ-Team AB

Customer experience

TruAirspeed

All ratings8 ratings
Positive75.0%
Neutral12.5%
Negative12.5%
Written reviews7 reviews
Positive71.4%
Neutral14.3%
Negative14.3%

SMIDIG

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

TruAirspeed

No in-app purchases

None

SMIDIG

No in-app purchases

Questions

Is TruAirspeed free?
TruAirspeed is free to download, with no in-app purchases.
Is SMIDIG free?
SMIDIG is free to download, with no in-app purchases.
Which has better reviews, TruAirspeed or SMIDIG?
SMIDIG is rated higher. TruAirspeed averages 4.1 out of 5 from 8 ratings, while SMIDIG averages 5.0 from 1 ratings.
Do TruAirspeed or SMIDIG have ads?
Neither TruAirspeed nor SMIDIG shows ads.
Which is updated more often, TruAirspeed or SMIDIG?
TruAirspeed ships an update every 24 months, and SMIDIG fortnightly. Most recently, TruAirspeed was updated on October 23, 2026 and SMIDIG on October 6, 2026.

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