# TruAirspeed vs SMIDIG

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.

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

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.

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

## The numbers

| Metric | TruAirspeed | SMIDIG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (8 ratings)](https://appshunter.io/ios/app/truairspeed/id855269892/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/smidig/id1630059935/reviews)** |
| Number of ratings | **8** | 1 |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 8 MB | 54 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [James Petty](https://appshunter.io/developer/603661046) | [AZ-Team AB](https://appshunter.io/developer/1032382682) |

## What reviewers say

### TruAirspeed

[App page](https://appshunter.io/ios/app/truairspeed/id855269892)

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:** macOS Compatibility

**In-app purchases:** none


### SMIDIG

[App page](https://appshunter.io/ios/app/smidig/id1630059935)

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:** Apple Wallet

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*