I used stackblitz during my Draper University Product Launch. They gave a hard deadline to launch and get the users and stackblitz was simplest in those circumstances.
Do give swipepages a try. I like them because of the following reasons: Google AMP pages, self hosted, can itegrate payment gateway, forms, 2 way forms etc.
You might want to give Atrato.Page a look. They've got a great team of engineers and digital marketers who will build and market the landing page for you
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