There are several technologies that can be used to build an app that can run on Android, Windows, and the web. Here are two common options:

Flutter: This is a cross-platform development framework that can be used to build native apps for Android, iOS, and the web. It uses Dart as the programming language and can also produce apps for Windows.

React Native with ReactJS: React Native can be used to build native apps for Android and iOS, and ReactJS can be used to build web apps. Both use JavaScript as the programming language, making it easier to share code between the different platforms.

There are other options as well, but these two are widely used and well-supported by a large community of developers, so they can be good starting points.
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