Principle for Mac

Principle 6.43 arrives as a maintenance update, keeping the app steady on its foundation while the broader design world shifts around it. The Retina interface remains crisp, Auto Save guards your work, and the core promise endures: a direct path from a static artboard to something that feels alive under the fingertips.

Short animations made fast: bounce, ease and spring effects on a timeline

• Short, expressive animations: the timeline makes quick work of bounce, ease and spring effects that a static mockup can only gesture at.
• Multi-screen flows: link artboards and trigger transitions to sketch out an entire onboarding sequence or checkout journey.
• Desktop and web prototypes: support for hover events and mouse-wheel scrolling means you can design interactions a touchscreen never sees.
• Polished reviews: running a prototype on device often surfaces timing issues and awkward states that flat files hide.

Single-platform limitation: macOS only, Intel build, English interface

• macOS only: Principle runs on the Mac; there is no Windows or iPad counterpart.
• Intel architecture: the current build lists Intel-only support, requiring macOS 10.14 or later.
• English interface: the app speaks a single language, which may matter in a multilingual studio.
• Learning the timeline: the animation model is approachable, but designers accustomed to code-based motion tools will need an afternoon to adjust.

Interaction panel oversight: why your artboard links refuse to fire

A few friction points tend to surface early, then fade once you know the remedy.

• Artboard links that refuse to fire: check the event type in the interaction panel. A tap trigger meant for a mobile prototype will ignore a hover gesture, and vice versa. Reassign the event to match the device profile you are designing for.
• Jittery scrolling on long pages: large bitmaps inside a scroll group can choke the timeline preview. Pre-scale images in Sketch or Figma before importing, and avoid nesting scroll groups inside one another unless the interaction genuinely calls for it.
• Mirror not discovering the Mac: both devices must sit on the same local network and the iOS companion app needs to be awake. If the connection still stalls, toggling Wi-Fi off and on again on the iPhone usually nudges the handshake back into place.
• Timeline keyframes drifting after an edit: Principle interpolates between keyframes, so a small timing adjustment on one property can shift the feel of the entire motion. Zoom the timeline with ⌘ and the scroll wheel to expose fine detail, then nudge keyframes with the arrow keys rather than dragging.
• Driver animation stutter: when a complex prototype feels sluggish, hide layers you are not actively animating. The canvas renders every visible element, so an artboard crammed with forty icons will tax the engine more than a clean, focused layout.

Forecast-card prototype: collapsing a weather row into a full card

Imagine you are mocking up a weather app and want to show how the weekly forecast expands from a collapsed row into a full card. You open Principle, drop two artboards onto the canvas, and name them “Closed” and “Open.” On the first artboard you arrange a compact row: icon, day label, temperature. On the second you lay out the expanded state with a wind-speed graph and an hourly breakdown. You select the row on “Closed,” click the lightning bolt, and drag a wire to “Open.” The interaction panel lights up: you set the trigger to Tap and the transition to Push with a gentle ease-out curve.

Now the artboards feel connected. You hold ⌘ and hover over the canvas to preview the tap, watching the row bloom open. The card jumps a little, so you lower the spring damping in the animation inspector and shorten the duration by two-tenths of a second. Satisfied, you add a second wire from “Open” back to “Closed” for the dismiss gesture, mirror the settings, and test the round trip. A few minutes later you connect an iPhone via USB, open Principle Mirror, and run through the flow with a thumb. The bounce feels right on device: tight, quick, believable. You save the file, knowing the developer will see what you meant, not guess at it.

• macOS 10.14 or later
• Intel processor