Principle

Interaction design and prototyping for Mac

Best for: iOS/macOS designers wanting precise timeline-based interaction animations for prototypes

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4.3/5Editorial score 79/100principleformac.com

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Editorial score79/100

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The editorial note

What to know about Principle

Principle is a Mac app for creating animated, interactive prototypes that feel like real apps. Unlike Figma (web-based prototyping), Principle's timeline-based animation editor lets designers craft transitions between screens with precise easing, stagger effects, and component animations. Used heavily by iOS and macOS designers to present interactions to developers before code is written. Principle exports to video for presentations and runs on device via the Principle Mirror app.

Is it right for you?

Who Principle suits

Choose it if

iOS/macOS designers wanting precise timeline-based interaction animations for prototypes

Look elsewhere if

Web design or team collaboration (Figma is better for both)

What you get

Key features

Timeline animations
Screen transitions
Component animations
Device preview
Video export
Figma import

Works with

Integrations3

Figma SketchPrinciple Mirror

The trade-off

Pros and cons

Pros

Timeline animation editor
Precise easing control
Mirror app for device preview
One-time purchase
Figma import
Video export

Cons

Mac-only
No real-time collaboration
Limited web design support

Quick read

At a glance

Category: Design & Creative
Pricing model: One time
Free plan: Not listed
Free trial: Available
Website: principleformac.com

The verdict

Our take on Principle

Best Mac app for precise iOS prototype animations. Principle's timeline editor gives iOS designers frame-level control over interactions that Figma's prototype mode cannot match — critical for presenting microinteractions to engineering teams.

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