StyleSeed

Your AI writes UI that looks like an AI wrote it.StyleSeed is the design engine that fixes that.

Design judgment for Claude Code · Codex · Cursor · vibe coding — so the output stops looking generated.

One component. Three brand DNAs. Same chat UI morphing across Toss · Raycast · Arc — colors, radius, motion, shadows, gradients all driven by StyleSeed tokens. Just a data-skin attribute.

Every design-AI skill makes your UI coherent. StyleSeed also fights the generic-AI look — and enforces it.

Judgment, not data — how designers think, not a palette collection  ·  Fights the AI tells — the default indigo, the icon-chip cliché, template layouts, rainbow lists  ·  A scored Quality Gate — reviews + fixes to ≥80/100 before you see it  ·  Every agent — ships CLAUDE.md + AGENTS.md + .cursorrules  ·  A design lock that stops drift  ·  Free & MIT

Full pages: before · after · more before/afters →

Same product, six looks — each one /ss-restyle <preset> away. Coherent, distinct, never generic.

Get Started · Engine + Skins · Motion · Skills · Wiki · 한국어

Get started in 30 seconds

The fastest way — paste this one sentence into Claude Code, Codex, Cursor, or any AI agent. It installs StyleSeed and runs the whole loop:

Install StyleSeed so its checks actually run: `npx skills add bitjaru/styleseed` (if you can't, read https://styleseed-demo.vercel.app/llms-full.txt instead). Then use it for every UI in this project. First, in plan mode, lock my key color, font, and motion with me and save them to STYLESEED.md so they don't drift. Build to the rules with ONE focal point and one accent. Before showing me anything, run the quality gate (/ss-score to ≥ 80: one accent, one radius, normal states grey not rainbow, real empty/error states) and fix what fails. If you're building a full screen, just run /ss-build — it enforces this whole loop.

Why the prompt installs first: the quality gate is the step that makes output stop looking generic — but /ss-score and /ss-build can only run if the skills are installed. Point an agent at the rules-URL alone and the "gate" degrades to an honor-system self-check it usually skips. Installing makes the loop real: the lock persists in STYLESEED.md (no drift), and the gate actually scores and fixes before you see anything. Can't install? The URL still teaches the rules — just weaker. Works with Claude Code (CLAUDE.md), Codex / Amp / Gemini CLI (AGENTS.md), and Cursor (.cursorrules) — StyleSeed ships all three. (Planning first is what keeps the result from looking random — see Troubleshooting.)

What your agent actually does with StyleSeed loaded:

you    ▸  build me a billing settings page
agent  ▸  (plan mode) key color? for billing I'd go deep teal — #0F766E, mood: sharp · calm ·
          trustworthy (not the default indigo). Motion: Snap. ok?  ▸ y
agent  ▸  ✓ wrote STYLESEED.md — skin, accent, font, radius, motion locked, re-read every prompt
agent  ▸  building… running the quality gate before I show you anything
gate   ▸  ✗ two accent colors   ✗ "normal" rows colored   ✗ no empty state   → fixing
agent  ▸  ✓ 88/100 — one accent, grey normal states, real empty/error states. here's the page.

The STYLESEED.md lock is the anti-drift mechanic. Your skin, key color, radius, and motion get written once and the rules make every agent re-read and obey them on every prompt — so the design stops being different each session. The Quality Gate then self-reviews and fixes the UI (rainbow lists, two accents, missing states) before you ever see it — and it can retrofit an old generic build too.

The rules are the product — and they need zero install or permissions. They're plain markdown (CLAUDE.md / AGENTS.md / DESIGN-LANGUAGE.md), so the prompt above — or just copying those files in — is 90% of StyleSeed with nothing to approve.

Want the /ss-* slash-command skills too (optional automation: setup wizard, review, score)?

npx skills add bitjaru/styleseed

Installs all 18 skills into Claude Code, Codex, Cursor, Gemini CLI, Amp and more — then run /ss-setup. Your agent will ask you to approve them once on first use (standard for any executable skill). No install possible? The rules alone still do the core work.

Your agent, its exact path:

More paths (manual copy, Cursor, awesome-design-md brands) in Install by hand below.

Who is this for?

• You asked Claude Code or Cursor to build a dashboard and it came out amateur-looking
• You're vibe coding a SaaS app and don't want to hire a designer
• You use shadcn/ui but the output still feels generic
• You want Toss-style refinement without reverse-engineering it yourself
• You're building a Claude Code skill or Cursor rules setup for design
• You ship fast with AI and need professional UI that doesn't look AI-generated

Where StyleSeed fits among design-AI skills

There are lots of "help your AI design" projects now. Most solve a slice. StyleSeed is the one that targets the whole "looks AI-generated" problem — and enforces the fix.

They're not all competitors — a DESIGN.md gives StyleSeed a skin; a generator gives it a first draft. StyleSeed is the judgment + enforcement layer the others don't have.

What it actually enforces (a taste)

The kind of specific, named calls a senior designer makes without thinking — written down so an AI applies them every time:

• The refined black is #2A2A2A, not #000 — a 5-step grayscale ramp, never pure black
• One accent, everything else greyscale — the single-accent law; a second hue is the fastest "un-designed" tell
• Numbers 2:1 with their unit — a 48px value over a 24px unit; equal sizes flatten magnitude into noise
• Nested-radius law: inner = outer − padding — concentric corners, so a card and its inner button agree
• Layered, low-opacity shadows (≤8%) lit from one direction — not one hard drop shadow
• Tabular numbers for anything that updates — no width jitter as values change
• Status color = severity only — a "normal" row is grey; color marks the exception, never a rainbow list
• No emoji icons, and no Lucide-in-a-pale-chip on every card (§CC-9b) — the two opposite AI icon tells
• 8px spatial grid; gap-around-a-group > gap-inside it — proximity that reads as structure
• **Optical, not pixel, ali