Prototype at the speed of a prompt
Describe the flow you have in mind and let your agent assemble a real, clickable prototype — multiple screens, shared styles, and live interactions — rendered straight to HTML you can open, share, and hand to engineering.
In one line
Open Design is the design layer for the coding agent you already use. For prototyping, that means going from a one-paragraph idea to a navigable, styled prototype in a single session — no design tool, no export step, no handoff gap.
How prototyping works with Open Design
- 01
Describe the flow
Tell your agent what you are building in plain language — "an onboarding flow with a welcome screen, a plan picker, and a confirmation." Open Design loads the prototype skill so the agent knows to produce screens, not a single page.
- 02
Generate styled screens
The agent applies a design system and prototype templates from Open Design, so every screen shares typography, spacing, and components instead of looking like a rough draft. You get a coherent set of screens, not disconnected mockups.
- 03
Wire up the interactions
Buttons navigate, tabs switch, modals open. The prototype renders to self-contained HTML, so it behaves like the real thing in any browser — no prototyping tool account required to view it.
- 04
Iterate and hand off
Refine by talking to the agent — "make the plan picker a three-column layout." Because the artifact lives in your project, the design and the eventual code share one source of truth, closing the usual designer-to-engineer handoff gap.
What you can prototype
prototype Read full prompt → Web Prototype
General-purpose desktop web prototype. Single self-contained HTML file built by copying the seed `assets/template.html` and pasting section layouts from `references/layouts.md`. Default for any landing / marketing / docs / SaaS page when no more specific skill matches.
prototype Read full prompt → Mobile App
A mobile-app screen rendered inside a pixel-accurate iPhone 15 Pro frame on the page. Built by copying the seed `assets/template.html` and pasting one screen archetype from `references/layouts.md`. Use when the brief asks for "mobile app", "iOS app", "Android app", "phone screen", or "app UI".
prototype Read full prompt → Saas Landing
Single-page SaaS landing with hero, features, social proof, pricing, and CTA. Respects the active DESIGN.md color/typography/layout tokens. Trigger keywords: "saas landing", "marketing page", "product landing".
prototype Read full prompt → Gamified App
A multi-frame gamified mobile-app prototype — three phone frames on a dark showcase stage. Frame 1: cover / poster, Frame 2: today's quests with XP ribbons and a level bar, Frame 3: quest detail. Vivid quest tiles, level ribbon, bottom tab bar. Use when the brief asks for a "gamified app", "habit tracker", "RPG-style life app", "level-up app", "daily quests", "XP / streak app", or "ELI5-style explainer app".
prototype Read full prompt → Hr Onboarding
A new-hire onboarding plan as a single page — first week schedule, buddy + manager intro, learning track, equipment checklist, and "you're set when…" outcomes. Use when the brief mentions "onboarding", "new hire", "first week plan", or "入职".
prototype Read full prompt → Kami Landing
Produce a print-grade single-page kami (紙 / 纸) document — warm parchment canvas, ink-blue accent, serif at one weight, no italic, no cool grays. The output reads like a professional white paper or studio one-pager, not an app UI. Multilingual by design (EN · zh-CN · ja). One self-contained HTML file, zero dependencies.
Prototyping with Open Design vs. the old way
| What you need | With Open Design | Traditional prototyping tools |
|---|---|---|
| Go from idea to first screen | ●One prompt in the agent you already have open | Open a separate tool, start a file, drag boxes by hand |
| Multiple linked screens | ●Generated as a set with shared styles and working navigation | Each frame drawn and linked manually |
| Consistent visual system | ●Pulled from a reusable design system the agent applies | Re-created per file or maintained by hand |
| Shareable result | ●Self-contained HTML — opens in any browser, no account | Viewer needs a seat or a share link in the vendor tool |
| Path to real code | ●Artifact lives in your repo; design and code share one source | Re-built from scratch after a separate handoff |
| Cost & lock-in | ●Open source, bring your own keys, runs locally | Per-seat subscription, vendor-hosted, export-limited |
Every one of these started as a prompt and rendered to a clickable artifact. Pick a template close to your idea, describe your variation, and the agent adapts it.
Prototyping FAQ
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01 Do I need a design tool like Figma to prototype with Open Design?
No. Open Design runs inside your coding agent and renders prototypes to HTML. You describe the flow in language; the agent produces the screens. There is no separate canvas tool to learn or pay for.
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02 Are the prototypes interactive or just static mockups?
Interactive. Navigation, tabs, and modals work because the output is real HTML and CSS. You can click through it in any browser exactly as a user would.
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03 Which agents can I use?
Open Design works with Claude Code, Codex, Cursor Agent, Gemini CLI, and a dozen more first-party adapters. You bring your own provider keys; nothing is hosted for you.
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04 Can a prototype become the real product?
That is the point. The artifact lives in your project, so the same design system and components carry into production code instead of being thrown away after a handoff.
Prototype your next idea tonight
Star the repo, install Open Design, and turn your next "what if" into something you can click — in the agent you already use.