Does AI AutoPost work with my theme, Elementor or Divi?

Yes. AI AutoPost creates normal WordPress posts, so they appear in your theme's usual single-post layout, the same as posts you write yourself. That includes themes built or customised with Elementor, Divi or any other page builder: whatever template you use for posts is used for AI AutoPost posts too.

• Posts go into your existing categories, with the author you choose; the plugin never creates new categories.
• The featured image is set the normal WordPress way, so your theme shows it wherever it shows featured images.
• You can edit any post afterwards in the normal WordPress editor.
• The plugin works in the background and loads nothing on your public pages.

It also works alone or together with SEO plugins such as Yoast SEO, Rank Math and All in One SEO. See the requirements for the WordPress and PHP versions it needs.