# Cair

> Cair (iPhone/iPad app by Dave Guerin.)

- Source: https://appshunter.io/ios/app/cair/id1197989847 (this page in markdown: same URL + `.md`)
- Developer: [Dave Guerin](https://appshunter.io/developer/357488432)
- Category: Utilities, Music
- Price: $0.99
- Age rating: 4+
- Requires: iOS 16.6 · 3 MB
- Languages: English
- Released: 2017-01-26
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/cair/id1197989847/reviews.md

## What is Cair?

The Speed of Sound in Air, where you are.

The Cair app calculates the Speed of Sound in Air from the air temperature, air pressure, and air humidity, optionally using the local conditions as provided by Apple Weather. If your device supports it, Cair is able to get the local air pressure directly from the device. There are popups to see the values in both metric and imperial units, and you can pick your preferred units for the main display of the values.

Cair can pass it's calculated Speed of Sound to another dgApps app, Lambda version 2.0.0 and newer. Lambda can use the Cair calculated Speed of Sound in it's calculation of frequency, wavelength, and musical note. Cair is a universal app, equally at home on an iPhone as on a iPad. In Split Mode on an iPad device, side by side with Lambda, the calculated Speed of Sound in Air is passed in real time to the Lambda app.

Cair allows you to share it's calculated Speed of Sound in Air via all the usual sharing methods.


## Version history (last 5 releases)

### 5.0.0 — 2026-05-01

The Speed of Sound in Air, where you are.

5.0.0
Updated for iOS 26
Updated for iPadOS 26

### 4.0.0 — 2023-04-04

4.0.0
iOS 16.0 and up now.
iPadOS 16.0 and up now.
A few UI tweaks.
Now using Apple WeatherKit for local weather values.
Apple Weather attribution is shown when the current slider value is the same as the latest retrieved value from Apple Weather.

### 3.0.0 — 2020-02-11

Totally removed Crashlytics and Answers. The only analytics and crash reporting of any sort is now via Apple, if you've (hopefully!) opted in to that.
iOS 13.2 and up now.
Now using SwiftPackages.
Now using *weatherstack for local weather values.
UI updated to work on all current devices.

### 2.0.1 — 2017-01-30

If your device supports it, Cair is now able to get the local air pressure directly from the device.
Better caching of the local weather conditions.
The units popups are now dismissed on rotating the device.
The units popups now point more towards their relevant value.

### 2.0.0 — 2017-01-26

No release notes.

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## More apps by Dave Guerin

- [Futurometer](https://appshunter.io/ios/app/futurometer/id357488429)
- [Lambda](https://appshunter.io/ios/app/lambda/id434581690)
- [Colo-u-ring](https://appshunter.io/ios/app/colo-u-ring/id1120052422)
- [Faders by dgApps](https://appshunter.io/ios/app/faders-by-dgapps/id1534494376)
- [Router by dgApps](https://appshunter.io/ios/app/router-by-dgapps/id1561324955)

All apps by Dave Guerin: https://appshunter.io/developer/357488432

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-17.*