Hi @Uelsimon,
At their heart, Pinegrow and Wappler are similar products, with some key differences. Both are designed to be low-code HTML builders. While I haven’t had a deep dive in how they handle API calls/dynamic data, it is likely through Ajax/JavaScript. These same methods can be used in Pinegrow. Granted, Wappler has some built-in tools for getting you up and running, but at a premium price.
Pinegrow also can be used to create WordPress themes. It isn’t a page builder like Divi or Elementor. However, if you can put the page together in HTML and PHP, Pinegrow works well.
Hope this helps,
Bob