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A better canvas versus a finished deck
Beautiful.ai's central idea is the Smart Slide: pick a layout, add content, and the slide re-balances itself so it never ends up crooked. There are more than 300 of them, and it's a genuinely good answer to the problem of a person building slides by hand — you stay in the driving seat the whole time.
Skiaw starts one step earlier. Describe the deck, and the engine researches it, writes the argument, chooses the structure and designs every slide before you see anything. You then refine it in conversation rather than by picking layouts.
The honest version of 'why switch': if you enjoy building the deck and just want the tool to stop it looking amateur, Beautiful.ai already does that well. If the deck itself is the chore standing between you and the meeting, that's the gap switching closes.