Principle

Name: Principle
Brand: Principle

Mac app for designing animated and interactive user interfaces.

softwareUI & UX Designmac-prototypingui-animationinteraction-design

What is Principle?

Principle is a native macOS application for designing animated and interactive user interfaces, letting designers build timeline-based animations, transitions, and custom interactions without writing code. It imports files from Figma and Sketch, visualizes multi-screen app flows from a bird's-eye view, and exports prototypes as shareable web links or video/GIF files.

SpecificationsAI-estimated

deploymentDesktop App

open source❌ No

api available❌ No

key integrationsFigma, Sketch

Key Features of Principle

Provides a timeline-based editor for creating bounces, eases, and custom motion curves.

Lets designers define custom interactions and gestures without pre-defined limitations or code.

Visualizes multi-screen app flows from a bird's-eye view of the whole prototype.

Imports files from Figma and Sketch with intelligent layer merging.

Supports custom artboard sizing alongside built-in device presets.

Exports prototypes as shareable web links with a single click.

Exports finished animations directly as video or GIF files for presentations or social media.

Runs as a native macOS app with Retina support and auto-save.

Use Cases for Principle

Micro-interaction design

Designers fine-tune button taps, transitions, and gesture-driven animations.

Multi-screen app flow prototyping

Teams map out and animate transitions across an entire app's screen flow.

Motion handoff to developers

Designers export animation timing as reference video for engineers to replicate in code.

Design portfolio and social sharing

Designers export polished animated prototypes as GIFs or videos for portfolios.

Pros & Cons of Principle

Pros

One-time purchase price rather than a recurring subscription
Used by design teams at major companies including Apple, Google, and Netflix per the vendor's own site
Deep, code-free control over interaction timing and animation curves
Direct video/GIF export makes sharing motion work outside the app easy

Cons

macOS only, with no Windows version available
One-time license still charges for major version upgrades and additional seats
Narrower focus on animation/interaction compared to full-featured, collaborative design suites

Frequently Asked Questions

Is Principle free?

No, Principle is a one-time paid purchase at $129, not a subscription or free tool.

Does Principle run on Windows?

No, Principle is macOS only.

Can I import Figma files into Principle?

Yes, Principle supports importing files from both Figma and Sketch.

Can I export animations as video?

Yes, Principle can export prototypes as video or GIF files in addition to shareable web links.

Pricing Overview

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Paid (One-time)

Principle

$129

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