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apple-hig

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Apple Human Interface Guidelines reference, updated for iPhone Duo and OS 27. Provides authoritative platform-specific design rules, component specifications, exact measurements, and interaction patterns for iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. Use when designing, reviewing, auditing, or fixing any Apple platform UI, or when asked about specific HIG components, sizing, system behaviors, frameworks (HealthKit, SiriKit, ARKit, etc.), or platform conventions. Also use when the user is designing any digital interface and could benefit from established design principles, even without an explicit Apple platform context. Includes a guided /duo workflow that adapts an existing iOS app to iPhone Duo, plus opt-in enforce mode with independent review.

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Last checked
Nov 6, 2026

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Oct 17, 2026
License
MIT

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# Apple HIG Skill

Use the distilled HIG references in `references/hig/` through `routing-index.md`. The source snapshot and verified release measurements are in README.md.

## Loading Protocol

Release **2026-09-27**; Apple source snapshot **2026-09-12**.
For help, installation, version or capability questions, read only this entry
point and the relevant README section. Do not load the HIG corpus for setup help.
Installing or upgrading this skill includes its `/duo` slash command. After the
skill folder is in place, check whether the host already offers `/duo`. If it
does not, copy `commands/duo.md` into the host's custom slash-command or custom
prompt directory (user-level unless the user asks for one project), confirm
`/duo` is available, and tell the user if a restart is needed.
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