“### 3. Axure RP — Worth considering for complex prototypes”
“Axure is particularly useful for complex interactions and application logic.”
“Conditional interactions.”
“Dynamic content.”
“Complex workflows.”
“Data-driven prototypes.”
“Detailed functional specifications.”
“However, don't assume that its enterprise deployment options mean the entire design and collaboration workflow can be self-hosted. Confirm the exact deployment model with the vendor.”
“### 1. Penpot — Best overall starting point”
“Open-source platform.”
“Self-host on your own infrastructure.”
“Supports Docker and Kubernetes deployment.”
“Control over data storage and infrastructure.”
“Enterprise options for SSO, advanced permissions, and audit logs.”
“Air-gapped deployment support is available as an enterprise add-on.”
“Inspect mode for CSS, HTML, and SVG.”
“Measurements and spacing information.”
“Reusable components and variants.”
“Native design tokens.”
“CSS Flexbox and Grid layouts.”
“Exportable design assets.”
“It also supports interactive prototypes with clickable elements, transitions, overlays, and scrolling.”
“Penpot's Inspect mode provides many of these capabilities.”
“My verdict: Penpot is the best first tool to evaluate because it addresses both sides of your problem: infrastructure control and developer handoff.”
“One important distinction: if you're working with highly regulated or confidential data, evaluate Penpot Enterprise's governance and deployment options rather than assuming the free self-hosted edition includes every enterprise security feature.”
“### 2. Quant-UX — Worth evaluating for interactive prototyping”
“Interactive prototyping.”
“User testing and behavioral analytics.”
“Simulating application interactions.”
“Evaluating user journeys.”
“I'd verify its current self-hosting capabilities, maintenance model, and security controls before adopting it for a strict enterprise environment.”