Possible ways to embed a flutter web app?

we want to embed a flutter WEB app on multiple web sites.

For now we can think of two approaches that could be followed

1. Embed using iFrame
2. Make the whole app using a script tag (not sure if it is possible with flutter yet)

Please let me know if there are other ways which I am missing out on.

Also, it would be great to know if there are any cons of using an iframe to embed a flutter web app.