Flash used the NPAPI to “break out” of the web and was basically “native” code you could escape to, whereas Flutter really is using web APIs, like Wasm, ARIA, WebGL, JS, WebComponents, and so on, to create true web apps that just happen to not use much of the control set that HTML exposes.
Read moreHow do I deploy my flutter web app?
#1: Firebase Hosting
Read moreDo flutter apps work on web?
The web itself is a flexible platform, but Flutter is ideal for building web applications like PWAs or SPAs and bringing your existing mobile app to the web .
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