Gamma is about generating the deck itself with AI. GeneratePPT doesn't try to write your content for you at all - it's the opposite job, stripping presentation tooling down to the parts that actually help you deliver: a timer, a teleprompter, and now a rehearsal stage. If Gamma gets you the slides, this is what gets you ready to stand in front of people with them.
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no-login, no-server-upload is the right call for something people will use to rehearse nervously. question on the "audience" part - is it just a static backdrop/crowd image, or does it do anything dynamic like simulate a distracted phone-checker or a front-row nodder to react to your pacing? curious how much of the value is the stage/timer mechanics vs. actually training eye contact and reading a room.