Mobile App

Mobile App Skill

Produce a single mobile-app screen mockup, framed inside a real-feeling iPhone 15 Pro device.

Resource map

mobile-app/
├── SKILL.md                ← you're reading this
├── assets/
│   └── template.html       ← seed: device frame + screen primitives (READ FIRST)
└── references/
    ├── layouts.md          ← 6 screen archetypes (Feed / Detail / Onboarding / Profile / Checkout / Focus)
    └── checklist.md        ← P0/P1/P2 self-review (anti-fake-device)

Workflow

Step 0 — Pre-flight

1. Read assets/template.html end-to-end through the `` block. The Dynamic Island, status bar SVG icons, home indicator, side rails, and tab bar are all already drawn in HTML/SVG — do not re-implement them inline on each screen.
2. Read references/layouts.md so you know which 6 archetypes exist.
3. Read the active DESIGN.md — map its tokens to the six :root variables in the seed.

Step 1 — Copy the seed

Copy assets/template.html to the project root as index.html. Replace the six :root variables with the active design system's tokens. Replace the page `` and the caption above the device.

Step 2 — Pick exactly one archetype

| Brief language | Use | |---|---| | feed, inbox, timeline, list, messages, notifications | A — Feed | | article, post, item, recipe, song, product, song detail | B — Detail | | sign-up, welcome, intro, walkthrough, tour | C — Onboarding | | profile, account, user page, someone's bio | D — Profile | | checkout, payment, order, form, settings step | E — Checkout | | timer, map, dashboard widget, single big number | F — Focus / hero card |

A mobile screen does one job. If the brief seems to combine two, ship one screen and offer the other as a follow-up.

Step 3 — Paste and fill

Copy the archetype block from layouts.md into `, replacing the placeholder card. Fill bracketed text with real, specific copy from the brief. **Drop the ` block entirely** for archetypes that don't show one (B, C, E).

Step 4 — Self-check

Run through references/checklist.md. Pay extra attention to:

• Frame still has the Dynamic Island, status bar SVGs, and home indicator
• Tap targets ≥ 44px
• One accent, used ≤ 2× on the screen
• Display headings still use var(--font-display) (serif)

Step 5 — Emit the artifact

...

One sentence before describing what's there. Stop after ``.

Hard rules

• The phone is real. Dynamic Island gap, SVG status icons, home indicator. The seed protects all three — don't rewrite the frame.
• Single screen, single job. No multi-tab tours, no spliced flows.
• Accent budget = 2. One active tab + one primary action is the default.
• Numerics in mono via .num class.
• Display in serif via var(--font-display).
• No external images — use .ph-img placeholders.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: nexu-io
• Source: nexu-io/open-design
• License: Apache-2.0
• Homepage: https://open-design.ai

Install and usage instructions live in the source repository linked above.