“My recommendation: Start with Penpot. It is probably the strongest starting point if you want to replace an established UI design and prototyping platform without committing to subscription costs.”
“Open source, collaborative, self-hosting, design systems”
“Penpot supports: - Interactive prototypes and transitions.”
“- Reusable components and design systems.”
“- Real-time collaboration.”
“- CSS, HTML, and SVG inspection.”
“- Self-hosting for greater data control.”
“Its free offering is particularly attractive because it includes core design and prototyping functionality without charging per editor.”
“2. Best for quick wireframes: Excalidraw.”
“| Wireframes and brainstorming | Simple, fast, collaborative | Not intended for high-fidelity prototyping |”
“| Wireframes and brainstorming | Simple, fast, collaborative | Not intended for high-fidelity prototyping |”
“3. Best for usability testing: Quant-UX.”
“| Interactive prototypes and user testing | Rapid prototyping, testing-oriented workflows | Less comprehensive design environment |”
“| Interactive prototypes and user testing | Rapid prototyping, testing-oriented workflows | Less comprehensive design environment |”
“4. Best for complex professional prototypes: Axure RP.”
“For example, Axure RP offers conditional logic, dynamic content, and functional forms.”
“| Complex UX prototypes | Advanced interactions and conditional logic |”
“5. Best for advanced interactive experiences: ProtoPie.”
“| High-fidelity prototypes | Advanced animations and realistic interactions |”
“- Figma – Collaborative interface design”