# Apple Hig

Apple Human Interface Guidelines reference, updated for iPhone Duo and OS 27.

- Repository: https://github.com/justinwetch/HIGAgentSkills (704 stars)
- Category: Design
- License: MIT
- Last updated: 2026-10-17
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add justinwetch/HIGAgentSkills --skill apple-hig -g -a claude-code -y`
Codex: `npx skills add justinwetch/HIGAgentSkills --skill apple-hig -g -a codex -y`
Cursor: `npx skills add justinwetch/HIGAgentSkills --skill apple-hig -g -a cursor -y`
Gemini CLI: `npx skills add justinwetch/HIGAgentSkills --skill apple-hig -g -a gemini-cli -y`

## Description

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.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# 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.
Work directly in the conversation and the user's project; do not create a browser
intake form, onboarding site, dashboard, or browser setup step.

Ordinary guidance is the default. Only an explicit request to apply enforce mode
activates its procedure. Read `references/enforce.md` first in that case and check
reviewer, Python and observation capabilities before loading the design guidance.
A leading `/duo`, `Use apple-hig in Duo mode`, or an explicit request to adapt
an existing app for iPhone Duo starts Duo mode: read `references/duo.md` and
follow its stages. Questions about the command and ordinary Duo design questions
stay ordinary guidance. Duo mode works only in the app's native code; it never
produces HTML, SVG, or web mockups.
Use the available Python 3.10+ interpreter (`python3` or `python`); do not assume
the executable name. Ordinary guidance also works without Python.

The rest: https://github.com/justinwetch/HIGAgentSkills/blob/HEAD//SKILL.md