Its signature feature is the of its UI elements (buttons, text fields, icons). This deliberate "unpolished" look encourages feedback on what the product does rather than what it looks like (e.g., colors, fonts, shadows).
It has not changed dramatically in years because its core value proposition remains strong. It forces the right kind of conversation early in the design process. If that's what you need, it's an excellent choice. If you need to go beyond that into visual UI or production handoff, look elsewhere (like Figma or Penpot). balsamiq mockups
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