I checked out SlideAI before; the image is from Pexels, not AI generated. I got inspired by tome.app, but it can't do presentations from text and it doesn't export ppts, nor pdf. So, we've got both; you can export ppts and it has AI generated images plus we're adding speaker's notes!

Edit - Please also do check that SlidesAI only creates presentations only from text, not topic. Also, do compare the content of generated presentations!