UI Builder – Mockup Tool
UI Builder – Mockup Tool is a fast Web Wireframe & Web Design Tool that lets you sketch UI layouts on any live page or on a new blank page.
Features
Instant wireframes
Turn any site or a blank canvas into a playground for mockups.
True WYSIWYG
Change button labels, headers, and colors right on the screen.
Pixel-perfect exports
Save selected areas as PNG or copy screenshots to the clipboard.
Privacy first
No network calls, ensuring data lives in chrome.storage.local.
Keyboard friendly
Easily duplicate, delete, or cancel actions using keyboard shortcuts.