The best Prototyping alternative to Microsoft Visio is Lucidchart, which is free. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft Visio and five of them are Prototyping Tools so hopefully you can find a suitable replacement. Other interesting Prototyping Tool alternatives to Microsoft Visio are Pencil Project, Miro, OmniGraffle and ProcessOn.
Lucidchart is a cloud-based platform that promotes teamwork through diagramming, collaboration, and data visualization. It serves millions worldwide, offering flowcharts, UML, real-time collaboration, Visio support, and browser access. Designed for innovation and understanding, it integrates easily into workflows.
Pencil is a standalone app that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
A secure collaboration platform for distributed teams offering real-time and asynchronous capabilities, infinite canvas, integrations with major tools like Google Suite, Slack, and Dropbox, and features for enhanced product development and design workflows.
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.
ProcessOn is One tool for diverse diagramming needs.Product capabilities are mainly divided into Mind Map,Flowchart,Whiteboard,Mermaid,Formula Editor.Most importantly, ProcessOn supports AI-powered graphing, empowering tools through intelligent AI.
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I have tried them all. Lucidchart is the easiest to use, works across all my devices, and supports real-time collaboration.