[invalidname]

It never used GWT. They claimed GWT can be used to build apps like gmail and that was misleading. They didn't write it using GWT since it predated the existence of GWT.

[nailer]

Thanks. Did any well known Google apps use GWT?

[invalidname]

I think Wave was written in it... Not sure if there were others.

[sgt]

When I checked 2-3 years ago, Google Cloud portal was based on GWT.