The tool that set the standard for this category and still the first one to try. You give Gamma a topic, an outline or a document, and it returns a full deck with a sensible structure, real layouts and images already placed. What makes it work is that the slides are built from flexible blocks rather than a fixed grid, so editing afterwards feels like editing a document rather than nudging text boxes, and nothing breaks when you add a paragraph.
The decks are web-first, which is the trade. They look best presented from a link, where they scroll and animate properly, and exporting to PowerPoint gives you something usable rather than something identical. If your deck ends its life as a shared link, that is no loss at all. If it has to arrive as a .pptx that a colleague will edit, look at Plus AI or Copilot instead.