{"slug":"emilkowalski-apple-design","name":"Apple Design","description":"Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing gesture-driven UI, spring animations, drag/swipe/sheet interactions, momentum and interruptible transitions, translucent materials and depth, typography (optical sizing, tracking, leading), reduced-motion, or the design foundations (feedback, spatial consistency, restraint) behind Apple-style interfaces.","long_description":"---\nname: apple-design\ndescription: Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing gesture-driven UI, spring animations, drag/swipe/sheet interactions, momentum and interruptible transitions, translucent materials and depth, typography (optical sizing, tracking, leading), reduced-motion, or the design foundations (feedback, spatial consistency, restraint) behind Apple-style interfaces.\n---\n\n# Apple Design\n\nHow Apple builds interfaces that stop feeling like a computer and start feeling like an extension of you. This knowledge comes from Apple's WWDC design talks — chiefly *Designing Fluid Interfaces* (WWDC 2018) — distilled and translated into the web platform (CSS, Pointer Events, `requestAnimationFrame`, spring libraries like Motion/Framer Motion).\n\nThe through-line: **an interface feels alive when motion starts from the current on-screen value, inherits the user's velocity, projects momentum forward, and can be grabbed and reversed at any instant.** Springs are the tool that makes all of this natural, because they are inherently interruptible and velocity-aware.\n\n## The Core Idea\n\n> \"When we align the interface to the way we think and move, something magical happens — it stops feeling like a computer and starts feeling like a seamless extension of us.\"\n\nAn interface is fluid when it behaves like the physical world: things respond instantly, move continuously, carry momentum, resist at boundaries, and can be redirected mid-motion. Everything below is a way to get closer to that.\n\nApple frames design as serving four human needs: **safety/predictability, understanding, achievement, and joy.** Every rule here serves one of them.\n\n## 1. Response — kill latency\n\nThe moment lag appears, the feeling of directness \"falls off a cliff.\" Response is the foundation everything else is built on.\n\n- **Respond on pointer-down, not on release.** Highlight a button the instant it's pressed. Waiting for `click`/touch-up to show feedback feels dead.\n- **Be vigilant about every latency.** Audit debounces, artificial timers, transition waits, and the ~300ms tap delay. Anything on the input path that isn't essential is a regression.\n- **Feedback must be continuous *during* the interaction, not just at the end.** For a drag, slider, or drawer, update the UI 1:1 with the pointer the whole way through — never animate only when the gesture completes.\n\n```css\n/* Feedback lives on the press, and it's instant */\n.button:active {\n  transform: scale(0.97);\n  transition: transform 100ms ease-out;\n}\n```\n\n## 2. Direct manipulation — 1:1 tracking\n\n> \"Touch and content should move together.\"\n\nWhen the user drags something, it must stay glued to the finger — and respect the offset from *where they grabbed it*. Snapping to the element's center on grab breaks the illusion immediately.\n\n- Use Pointer Events with `setPointerCapture` so tracking continues even when the pointer leaves the element's bounds.\n- Track a short **velocity/position history** (last few `pointermove` events), not just the current point — you'll need velocity at release.\n\n```js\nel.addEventListener('pointerdown', (e) => {\n  el.setPointerCapture(e.pointerId);\n  const grabOffset = e.clientY - el.getBoundingClientRect().top; // respect where they grabbed\n  // ...track position + timestamp history for velocity\n});\n```\n\n## 3. Interruptibility — the single most important principle\n\n> \"The thought and the gesture happen in parallel.\"\n\nEvery animation must be interruptible and redirectable at any moment. A user must be able to grab a moving element mid-flight and reverse it without waiting for the animation to finish. A closing modal the user grabs again should follow the finger — not finish closing first, then reopen.\n\n- **Never lock out input during a transition.**\n- **Always animate from the *presentation* (current) value, never the target value.** On interrupt, read the element's live on-screen transform and start the new animation from there. Starting from the logical/target value causes a visible jump.\n- **Avoid CSS transitions and `@keyframes` for anything gesture-driven** — they can't be smoothly grabbed and reversed mid-flight. Springs animate from the current value by default, which is exactly what interruption needs.\n- **When a gesture reverses, blend velocity — don't hard-cut it.** Replacing one animation with another at a reversal creates a velocity discontinuity, a \"brick wall.\" Spring libraries that carry velocity through a re-target avoid it. (This is what iOS's *additive animations* do natively; on the web, choose a spring library that re-targets from the current velocity.)\n- **Decompose 2D motion into independent X and Y springs.** A single spring on a 2D distance desyncs when X and Y have different velocities.\n\n## 4. Behavior over animation — use springs\n\n> \"Think of animation as a conversation between you and the object, not something prescribed by the interface.\"\n\nA pre-scripted, fixed-duration animation can't respond to new input. A spring can — new input just changes the target, and the motion stays continuous. Reach for springs for anything a user can touch.\n\nApple deliberately replaced the physics triplet (mass/stiffness/damping) with two designer-friendly parameters. Think in these:\n\n- **Damping ratio** — controls overshoot. `1.0` = critically damped, no bounce, smooth settle. `< 1.0` = overshoots and oscillates. Lower = bouncier.\n- **Response** — how quickly the value reaches the target, in seconds. Lower = snappier. **This is not \"duration\"** — a spring has no fixed duration; its settle time emerges from the parameters.\n\n**Defaults:**\n- Start most UI at **damping `1.0`** (critically damped) — graceful and non-distracting.\n- Add bounce (**damping ~`0.8`**) **only when the gesture itself carried momentum** (a flick, a throw, a drag release). Overshoot on a menu that just faded in feels wrong; overshoot on a card you flicked feels right.\n\n**Concrete values Apple ships:","tagline":"Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing gesture-driven UI, spring animations, drag/swipe/sheet interactions, momentum and interruptible transitions, translucent materials and depth, typography (optical sizing, tracking, leading), reduced-motion, or the design foundations (feedback, spatial consistency, restraint) behind Apple-style interfaces.","category":"design-creative","tags":["agent-skill","apple-design","interface-design","motion","web-ui"],"author":"Emil Kowalski","verified":true,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"curated github","sourceDetail":"emilkowalski/skills","creatorName":"Emil Kowalski","creatorUrl":"https://github.com/emilkowalski","sourceUrl":"https://github.com/emilkowalski/skills/tree/main/skills/apple-design","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/emilkowalski-apple-design#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. Creators can claim the listing to update ownership signals."},"stats":{"stars":7906,"forks":436,"downloads":0,"rating":0,"review_count":0,"quality_score":71.69},"quality":{"score":100,"tier":"excellent","label":"Excellent","summary":"High-confidence pick with strong adoption and healthy maintenance signals.","signals":[{"label":"GitHub stars","value":"7.9K","tone":"positive"},{"label":"Freshness","value":"1d ago","tone":"positive"},{"label":"Install ready","value":"Yes","tone":"positive"},{"label":"License","value":"MIT","tone":"neutral"}],"warnings":[]},"trust":{"version":"trust-score-v5","score":90,"base_score":93,"outcome_confidence":0,"tier":"strong","label":"Review then install","summary":"Good shortlist signal, but the agent should review audit notes, install policy, and outcome evidence before running it.","recommendedAction":"Use as the primary candidate after human or sandbox 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Skill purpose: Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing gesture-driven UI, spring animations, drag/swipe/sheet interactions, momentum and interruptible transitions, translucent materials and depth, typography (optical sizing, tracking, leading), reduced-motion, or the design foundations (feedback, spatial consistency, restraint) behind Apple-style interfaces."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"Apple Design\" from https://github.com/emilkowalski/skills/tree/main/skills/apple-design into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Apple's approach to interface design and fluid, physical motion, translated for the web. 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