Lunacy review

Lunacy is a free design app from Icons8 that runs natively on Windows, macOS and Linux, with a browser version added for quick access. It covers the core of interface work: auto layout with constraints, components and variables, clickable prototypes and real-time collaboration, and it keeps working offline. Built-in graphics are its distinctive extra, with Icons8 icons, illustrations, photos and UI kits available inside the canvas, plus AI helpers for upscaling, background removal, placeholder text and avatars. It also imports Figma files and converts them to the .sketch format. A full single user license costs nothing, which makes Lunacy the most capable free native option for Windows and Linux designers. Teams that need private infrastructure can deploy Lunacy Cloud on their own server, but that starts with a demo request. The plugin ecosystem and community are much smaller than Figma's, and prototyping stops at clickable flows rather than logic-driven interactions.

Who it is for

Windows and Linux designers who want a free native app that works offline

Price

Free; full single user license at no cost.

Full single user license Free
Quoted from the vendor pricing page on November 11, 2026.

Key features

• Native apps for Windows, macOS and Linux, plus a browser version
• Auto layout, components and variables
• Online and offline modes with real-time collaboration
• Clickable prototypes
• Built-in Icons8 icons, illustrations, photos and UI kits

Strengths and weaknesses

• Strength: Full single user license is free
• Strength: Runs natively on Linux, which most rivals do not support
• Strength: Imports Figma files and converts them to .sketch
• Weakness: Smaller community and plugin ecosystem than Figma or Sketch
• Weakness: Prototyping is limited to clickable flows compared with Axure RP or ProtoPie
• Weakness: Self-hosted Lunacy Cloud for teams requires a sales demo request

Key facts

• Free plan: Yes, full single user license
• Platforms: Windows, macOS, Linux and browser
• Offline mode: Yes
• Languages: English, Chinese, Spanish and 21 others

Where it ranks

Lunacy is No. 5 in our Best UI Design Tools verdict.