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Principle

principle.app

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Spec score 7.9 #17 of 30 in Prototyping tools

Spec sheet

Purpose
Principle is a tool for designing animated and interactive user interfaces for web, mobile, and desktop.Read 8 Oct 2026 · principle.app
Intended users
The maker describes Principle as a way to evaluate interface ideas before engineering work and communicate prototypes to engineering teams.Read 8 Oct 2026 · principle.app
Free plan
NoRead 21 Sep 2026 · principle.app
Trial
The full version is free to try for 14 days, counting only days the user actually uses it.Read 8 Oct 2026 · principle.app
Support
The maker says Principle is a one-person company and that replies to messages may take at least a week; help is also available through its community forum and documentation.Read 8 Oct 2026 · principle.app
Animation
Its timeline lets users customize animation timing and easing, including spring animations.Read 8 Oct 2026 · principle.app
Desktop platform
Principle is a native macOS app that runs on Intel and Apple Silicon Macs.Read 8 Oct 2026 · principle.app
Export
Principle can export a design as a single self-hostable HTML file, a video, or an animated GIF.Read 8 Oct 2026 · principle.app
Imports
Principle can import designs from Figma or Sketch and intelligently merge work when designs are imported again.Read 8 Oct 2026 · principle.app
Interactions
Prototypes can use interactions such as dragging, scrolling, paging, taps, and hover events.Read 8 Oct 2026 · principle.app
License limit
A license applies to one computer, and new features released after the first year require renewal to use.Read 8 Oct 2026 · principle.app
Multi-screen flows
Users can design multi-screen app flows and see an overview of their screens.Read 8 Oct 2026 · principle.app
Sharing
Share to Web creates a private shareable link that opens in a browser on Windows, macOS, Linux, Android, and iOS.Read 8 Oct 2026 · principle.app

Plans and prices

Principle license $129 a month Licenses can continue to be used after one year, but new features require renewal. 1 computer Read 21 Sep 2026 · principle.app
License renewal $99 a month Renewal price is listed per computer. 1 computer Read 21 Sep 2026 · principle.app
License renewal $99, paid once Per computer Renews an existing license Read 8 Oct 2026 · principle.app
Principle license $129, paid once Per computer; includes new features released within one year of purchase Continued use after one year; renewal required for new features Read 8 Oct 2026 · principle.app

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Where Specifiction places it

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