protopie.io
Easiest prototyping tool
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Hunter's comment
Piece hi-fi interactions together, build sensor-aided prototypes and share your amazing creations in a matter of minutes
kinda neat actually, i mean especially if your looking for funding for a project and you just need to put together a basic MVP until you can actually you know hire the right people to put the thing together properly ;)
nah in all seriousness, i'm seeing a lot of prototyping tools coming out that actually allow the visual of us who don't enjoy being a code nerd play with the frontend and dynamically build the the initial codebase for further tinkering.
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Hunter: 
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