UI Builder – Mockup Tool icon
UI Builder – Mockup Tool icon

UI Builder – Mockup Tool

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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. Quickly show clients possible design changes directly on the live website, without switching tools.

UI Builder – Mockup Tool screenshot 1

License model

  • Free • Proprietary

Application types

Country of Origin

  • EE flagEstonia
  • European Union flagEU

Platforms

  • Google Chrome
UI Builder – Mockup Tool screenshot 1
UI Builder – Mockup Tool screenshot 2
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UI Builder – Mockup Tool screenshot 3
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Features

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Properties

  1.  Lightweight

Features

  1.  Auto Layout
  2.  Live Preview
  3.  No Tracking
  4.  Create UI Components
  5.  No Coding Required
  6.  Ad-free
  7.  Design handoff
  8.  Support for Layers
  9.  Works Offline
  10.  Color Picker
  11.  UI Design
  12.  Wireframing
  13.  Browser extension
  14.  Sketching
  15.  Prototyping

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UI Builder – Mockup Tool information

  • Developed by

    EE flagValmisLab

  • Licensing

    Proprietary and Free product.

  • Alternatives

    2 alternatives listed

  • Supported Languages

    • English
    • Arabic
    • Chinese
    • Czech
    • Danish
    • Dutch
    • Estonian
    • Finnish
    • French
    • German
    • Hebrew
    • Hindi
    • Hungarian
    • Indonesian
    • Italian
    • Japanese
    • Korean
    • Norwegian
    • Polish
    • Romanian
    • Russian
    • Slovak
    • Spanish
    • Swedish
    • Turkish
    • Vietnamese

AlternativeTo Categories

Photos & Graphics, Development, Web Browsers

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UI Builder – Mockup Tool was added to AlternativeTo by alx-hnld on May 5, 2025 and this page was last updated May 5, 2025.
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What is 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. Quickly show clients possible design changes directly on the live website, without switching tools.

🔵 Built for designers, product owners, developers and business analysts who need instant mockups without leaving the page. Drag-and-drop hand-drawn widgets, resize them smoothly, edit text in place, snap a quick screenshot, and share — all 100 % locally in your browser for rapid prototyping.

🔹 Instant wireframes – turn any site (or a blank canvas) into a playground for mockups 🔹 True WYSIWYG – change button labels, headers and colours right on the screen 🔹 Keyboard friendly – Ctrl/? + C/V to duplicate, Delete to remove, Esc to cancel 🔹 Pixel-perfect exports – save the selected area as PNG or copy a screenshot to clipboard 🔹 Privacy first – no network calls, analytics or trackers; data lives in chrome.storage.local 🔹 Lightweight – injected only on demand, keeping everyday browsing fast

  1. Install & pin the toolbar icon
  2. Click UI Builder – the palette appears
  3. Drag widgets (buttons, headers, inputs, frames, dividers…) onto the page or blank canvas
  4. Resize / recolour until it looks right
  5. Press the disk icon, draw a marquee, confirm ? – get your PNG or paste straight to Slack / Figma / Jira

Perfect for: 🔹 quick idea sketching before opening heavy design tools 🔹 annotating client websites during live calls 🔹 teaching web-design basics without extra software 🔹 creating product screenshots for specs and tickets

UI Builder – Mockup Tool Videos

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