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The character cap is the real ceiling
SlidesAI's own pricing page states a per-presentation character limit at every tier: 2,500 characters on the free Basic plan, 6,000 on Pro, 12,000 on Premium. That's roughly the length of a long paragraph to a couple of pages of source text — enough to outline a deck, not enough to hand over a full brief, a set of research notes, or a real document and expect the tool to work through all of it.
Skiaw has no equivalent input cap. It reads whatever you attach — PDF, DOCX, PPTX, TXT, Markdown — and searches the web on top of it, then decides what belongs on which slide. The limiting factor is credits spent generating the deck, not characters spent describing it.