Flutter 3, released earlier this year, adds support for macOS and Linux desktop apps, in addition to the original Android, iOS, web, and Windows targets.

Developers have had to write different apps for iPhones and Android for years. These tools aim to make cross-platform app development easier.

The native client apps tested were the then-current versions of Apple Mail, Calendar, Contacts, and Notes on MacOS and iOS; Google Gmail, Calendar, and Contacts on Android; and Samsung Email ...