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Top Open Source UI/UX Design Tools in 2026

A curated collection of the 4 best free and open-source UI/UX Design tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.

  • Plasmic

    Open-source visual builder for web apps

    Stars
    6,975
    Last commit
    10d ago
    License
    MIT

  • Quant-UX

    Open source UX design and user testing tool

    Stars
    2,690
    Last commit
    19d ago
    License
    GPL-3.0

  • Penpot

    Open-source design platform for teams

    Stars
    59,234
    Last commit
    10d ago
    License
    MPL-2.0

  • Grida

    Free open canvas for designing web apps

    Stars
    2,623
    Last commit
    16d ago
    License
    Apache-2.0
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Showing 4 of 4 open-source tools