Calculator for Windows 10 was placed on the open-source repository GitHub some months ago. Now, the developer Jérôme Laban has released iOS, Android and WebAssembly ports via the Uno platform. Therefore, nearly anyone with any device can enjoy the versatile Fluent Design app.
https://www.notebookcheck.net/Windows-Calculator-ports-for-Android-iOS-and-web-are-now-available.426534.0.html