Fully updated for iOS 15 and 16 and iPadOS 15 and 16. iOS 15.0 and iPadOS 15 and up now. Now using SwiftPackages. UI updated to work on all current devices. Audio tone generator totally rewritten from scratch using AudioKit, Swift, and SwiftUI. Audio frequency tracker totally rewritten from scratch using AudioKit, Swift, and SwiftUI. This is the first time Swift and SwiftUI has been used in an app from dgApps! The Privacy Policy is now show in the users default browser from dgapps.ie. The Harmonic table has been reworked so that the text isn't overwritten. The Questions and Comments email should now open in the users default email client. Slight tweaks to the design of the Frequency of A4 and the Speed of Sound settings. All screens now respect the users appearance settings for dark or light modes.

This app has been updated by Apple to display the Apple Watch app icon. Better handling of the Speed of Sound in Air notifications from the Cair app. Bug fixes.

Fully updated and rewritten for iOS 10. Now features a Frequency Tracker. Now using AudioKit. Now a universal iPhone and iPad app. Now rotates to all orientations. Now features a waveform plot for both the Oscillator and the Frequency Tracker. Now uses both imperial and metric units for both wavelength and the Speed of Sound. Can use the Speed of Sound in Air as calculated by another dgApps app Cair. The Cair calculated Speed of Sound in Air is passed in real time to the Lambda app, especially useful in Split Mode on an iPad device when Lambda is side by side with Cair.