Hi! I've released a second version of my free app for live sound engineers. It calculates the speed of sound and the time delay using temperature, humidity and pressure. https://apps.apple.com/us/app/speedair-speed-of-sound/id6480329550?platform=iphone This time, I decided to make it more international and improve the plain screenshots. I added US units (feet and °F) and French and German translations. I also used automatic number formatting. I also wanted simple in-app purchases. Just an optional tip jar to get used to the App Store configuration. I'm not expecting much, but it works! In-App Purchases - StoreKit2: Simple StoreView and TransactionObserver class - Products: Small, medium and Large tip Localisation - Language: String Catalog for German and French - Units: Locale Metric or US - Number Formatting: Decimal point vs comma Translation - ChatGPT: Asked for translations in an app context. E.g. 'Done', 'Close'. Screenshots - Used appscreens.com free version (allows 1 project) - Video (Not working) - Used iMovie to convert simulator mp4 to the correct resolution - Did not process in Connect correctly. Said audio corrupted but there was no audio. - I will try again