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Principle

Principle is software for designing animated, interactive interfaces for web, mobile, and desktop.

Place
#19 of 41
Score
6.9
Principle's website

What Principle is

Principle is software for designing animated, interactive interfaces for web, mobile, and desktop. Its timeline controls animation timing and easing, including spring animations. Prototypes can respond to dragging, scrolling, paging, taps, and hover events. You can map multi-screen app flows and review an overview of screens. Principle imports designs from Figma or Sketch and can merge work when designs are imported again. Share to Web creates a private browser link that opens on Windows, macOS, Linux, Android, and iOS. Exports include a self-hostable HTML file, video, or animated GIF. The native macOS app runs on Intel and Apple Silicon Macs. It is positioned for evaluating interface ideas before engineering and communicating prototypes to engineering teams. Principle is paid, with a 14-day usage-based trial and no free plan. The listed license is $129 a month for one computer; renewal is $99 a month per computer.

Good

  • Timeline supports easing and spring animations
  • Interactions include dragging, scrolling, taps, and hover
  • Imports Figma and Sketch designs
  • Exports HTML, video, and animated GIF
  • Private browser sharing supports many platforms

Watch out

  • No free plan
  • License applies to one computer
  • New features after one year require renewal
  • Support replies may take at least a week

Who it suits

Principle suits interface designers and teams building animated prototypes, multi-screen flows, or design-system work before engineering. It also fits people who need browser sharing or exports for engineering communication.

Verdict

Principle combines animation controls, interactive events, screen-flow mapping, imports, sharing, and exports in a native macOS tool. Check the one-computer licensing and renewal terms before choosing it.

Plans and prices

From Principle's own pricing page, checked 8 Oct 2026.

All about pricing
PlanPriceWhat it gives you
License renewal$99, paid onceRenews an existing license · Per computer
Principle license$129, paid onceContinued use after one year; renewal required for new features · Per computer; includes new features released within one year of purchase

The facts

Each one read from Principle's own pages, with the date it was checked.

What it does

Animation
Its timeline lets users customize animation timing and easing, including spring animations.checked 8 Oct 2026
Export
Principle can export a design as a single self-hostable HTML file, a video, or an animated GIF.checked 8 Oct 2026
Imports
Principle can import designs from Figma or Sketch and intelligently merge work when designs are imported again.checked 8 Oct 2026
Intended users
The maker describes Principle as a way to evaluate interface ideas before engineering work and communicate prototypes to engineering teams.checked 8 Oct 2026
Interactions
Prototypes can use interactions such as dragging, scrolling, paging, taps, and hover events.checked 8 Oct 2026
License limit
A license applies to one computer, and new features released after the first year require renewal to use.checked 8 Oct 2026
Multi-screen flows
Users can design multi-screen app flows and see an overview of their screens.checked 8 Oct 2026
Purpose
Principle is a tool for designing animated and interactive user interfaces for web, mobile, and desktop.checked 8 Oct 2026
Sharing
Share to Web creates a private shareable link that opens in a browser on Windows, macOS, Linux, Android, and iOS.checked 8 Oct 2026
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.checked 8 Oct 2026

Where it runs

Desktop platform
Principle is a native macOS app that runs on Intel and Apple Silicon Macs.checked 8 Oct 2026

Money

Free plan
Nochecked 21 Sep 2026
Trial
The full version is free to try for 14 days, counting only days the user actually uses it.checked 8 Oct 2026

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