
Fluid UI

Browser-based prototyping tool for building interactive, animated app prototypes without writing code

Proto.io is a web-based prototyping application. People build interactive web, iOS and Android prototypes by dragging and dropping elements, with no code involved, and can move from a basic wireframe to something that feels like a finished app.
UX designers, entrepreneurs, product managers, marketers and anyone with an app idea.
Profile written by TrustList from the business's own published information, Oct 2026.
An earned signal from verification, reviews, awards, transparency and engagement — the vendor can't buy it.
Updated 8/11/2026
As of 2026-10-05. Organic ranks only; sponsored placements are never ranks.
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