The best Prototyping alternative to Theory Maker is Penpot, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 10 alternatives to Theory Maker, but unfortunately only two of them are Prototyping Tools.
Open-source design platform offering web-based and self-hosted workflows, code inspection in HTML and CSS, adaptive layouts with CSS Grid and Flex, real-time collaboration, auto layout features, reusable components, design tokens, layer support, plugins, and no tracking.
OmniGraffle can help you make eye-popping graphic documents—quickly—by providing powerful styling tools, keeping lines connected to shapes even when they’re moved, and magically organizing diagrams with just one click.
Spain
EU
United States