01 · Best for your own template and native .pptx
Brightdeck
Brightdeck is #1 because it removes both walls at once. There is no export step — every slide is generated as native PowerPoint with editable text boxes, shapes, charts, and tables, on any plan, with speaker notes included. And instead of imposing its own design system, it is the only AI that adds slides to an existing PowerPoint deck without breaking the layout: upload your branded .pptx and new slides match its fonts, colors, and layouts. Layouts skew consulting-grade — frameworks, 2x2s, matrices — and it runs inside ChatGPT and Claude.
Trade-offs: it doesn't have Beautiful.ai's live auto-rebalancing web editor — refinement happens in PowerPoint itself — and native Google Slides output is on the roadmap, not shipped (the .pptx imports cleanly).
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