Prototyping
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Deliberately ugly, hand-drawn-style wireframes that keep stakeholders arguing about layout instead of button colors.
The fastest way to sketch a screen flow on a shared whiteboard that anyone can jump into and edit live, no signup required.
Basically the default for mocking up screens and wiring them into a clickable prototype your team can actually poke at.
Skips the mockup-then-rebuild cycle entirely — drag out a design and it's already a real, interactive site.
Meta's free patch-based tool for nailing motion and interaction detail that most drag-and-drop prototypers can't fake.
Handles the fiddly stuff — sensors, gestures, conditional logic — that makes a prototype feel like real software, no code.