The best Prototyping alternative to Canva is Penpot, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Canva and three of them are Prototyping Tools so hopefully you can find a suitable replacement. Other interesting Prototyping Tool alternatives to Canva are Figma and Penpot Desktop.
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.
Figma is a web-based platform offering a robust set of tools for vector graphics editing and prototyping, along with offline desktop apps for seamless workflows. Designed specifically for UI and UX design, it emphasizes real-time collaboration, visual versioning, and vector networks to streamline the designer's work.
Penpot Desktop is an unofficial desktop application for the open-source design tool, Penpot.
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It's free and open source, so we can be sure it does not go away.