# TruAirspeed vs performify

The clearest difference is in-app purchases: TruAirspeed at none against performify's 1. TruAirspeed also leads on iOS requirement (15.6 vs 17.0). performify's advantage is update cadence (every 2 months vs every 24 months). On price, ads and device support there is nothing between them.

Both are free to download. performify sells 1 in-app purchase, starting at $2.99 per month. TruAirspeed asks for nothing beyond the download.

TruAirspeed ships an update every 24 months, performify every 2 months. The most recent releases landed on June 2, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | TruAirspeed | performify |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (8 ratings)](https://appshunter.io/ios/app/truairspeed/id855269892/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 8 MB | 95 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [James Petty](https://appshunter.io/developer/603661046) | [Pascal Burlet](https://appshunter.io/developer/1493425854) |

## 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


### performify

[App page](https://appshunter.io/ios/app/performify/id1493425855)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AviatorPro | $2.99 | per month |


## Frequently asked questions

### Is TruAirspeed free?

TruAirspeed is free to download, with no in-app purchases.

### Is performify free?

performify is free to download, with in-app purchases available.

### Do TruAirspeed or performify have ads?

Neither TruAirspeed nor performify shows ads.

### Which is updated more often, TruAirspeed or performify?

TruAirspeed ships an update every 24 months, and performify every 2 months. Most recently, TruAirspeed was updated on June 2, 2026 and performify on September 17, 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.*