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πŸ”’keystone.design
Keystone
104 design seeds. One button. Zero design skills required.

Your product works. Now make it beautiful.

SeedFlip gives you curated design seeds β€” fonts, colors, shadows, the works β€” applied to a real page in one click. Export as CSS, Tailwind, shadcn/ui, or a complete DESIGN.md your AI agent actually understands. Or plug it straight into your editor with the MCP server.

β€œConsider me flipped.”

β€” @nikkimitss, Passive Studios

Flip β†’
Watch it work ↓

Works with your stack

104
CURATED SEEDS
98
PREMIUM FREE FONTS
7
EXPORT FORMATS
Aa
Real type pairings.
Google Fonts loaded live. Heading + body combos that actually work together β€” weights, spacing, and scale already dialed in. Not a font picker. A font decision.
β—‘
Complete color systems.
Background, surface, text, muted, accent, accent-soft, borders, gradients. Every seed has 10+ coordinated tokens. Not five swatches on a mood board. A system.
{ }
Ship-ready exports.
CSS Variables. Tailwind Config. shadcn/ui theme. IDE rule files. Or connect the MCP server and let your agent pull seeds directly. Seven formats. Zero guesswork.
β€œ

β€œAI gave every developer the power to build. It did not give them the power to design. The code was never the bottleneck. The design was. It still is.”

CURRENT SEED TYPOGRAPHY
Inter
Every seed pairs a heading and body font that actually belong together. Weights, spacing, and scale β€” already decided. You just flip.
LOCK & FLIP
Keep what you love. Flip the rest.
Lock any category β€” type, palette, shape, or atmosphere β€” and flip everything else. Thousands of combinations from 104 curated seeds. PRO
THE LAB
Extract the DNA.
Every way to take your seed home. CSS Variables. Tailwind Config. shadcn/ui theme. IDE rule files for Cursor, Claude, and Windsurf. Or connect the MCP server and let your agent pull seeds on demand.
THE ARCHIVE
104 seeds. All killer. No filler.
Browse every design seed in the collection. Dark, light, neon, editorial, brutalist, minimal β€” each one hand-curated with real Google Fonts and a full DESIGN.md. Your daily flip lands in your inbox every morning.
β€œ

I described the same design to Claude four different times and got four completely different results. Not one of them looked right. The problem was never my prompting. I didn’t have a design seed. I had adjectives. SeedFlip gave me the actual values. First try. Done.

J
Jamie K.
Indie Hacker
β€œ

My cofounder finally said it out loud. β€œThis looks like every other app on Product Hunt.” He was right. Same zinc palette. Same Inter font. Same everything. Pulled a SeedFlip seed into our Tailwind config and the next build looked like a different company made it.

P
Priya S.
Technical Cofounder
β€œ

I’ve shipped six projects and every single one looked like a developer made it. Because one did. Plugged the MCP server into Cursor, told it to pull something editorial and warm. Twenty minutes later I had a product I’d actually screenshot. No designer. No Figma file. Just the right inputs.

M
Marcus C.
Design Engineer

Simple pricing.

Free gets you flipping. Pro gets you shipping.

Free
$0
forever
βœ“ Unlimited flips
βœ“ 104 curated seeds
βœ“ CSS Variables export
βœ“ CLI + MCP server
βœ“ Edit mode
βœ“ Full Archive access
Start Flipping β†’
Just your email. That's it.
Pro
$19/mo
cancel anytime
Everything in Free, plus:
βœ“ Lock fonts, colors, shape & atmosphere
βœ“ DESIGN.md export
βœ“ Tailwind + shadcn/ui exports
Get Pro β†’
DESIGN.md is a complete design system document. Creative direction, exact tokens, and implementation code. Drop it in your repo and your AI builds to spec.

You're one flip away from looking like you hired a designer.

104 curated design seeds. Real fonts. Real color theory. AI-ready prompts that actually work. No Figma file. No design committee. No three-week sprint to pick a gray.

Flip β†’
SEED
Keystone
VIBE
Identity infrastructure. Clean, precise, slightly purple.
BEST FOR
authentication and identity management admin panelsdeveloper SDK documentation with component examplesAPI key and webhook management dashboardssecurity and access control configuration interfaces
01aggressive -0.03em tracking reads as precise and authoritative
02off-white #F7F7F8 background makes pure white cards pop
031px border ring gives components defined card-like quality
04violet-purple accent is strong trustworthy and modern
05slight purple tint in text unifies palette subliminally
Skip if:β€’ your brand is warm and editorial. the cool gray-purple palette fights warm organic design languageβ€’ your product targets mainstream consumers. the aggressive -0.03em tracking reads as developer-native not universalβ€’ you need dark-mode parity. this cool off-white palette does not translate cleanly to dark purple surfaces
104 design seeds. One button. Zero design skills required.

Your product works. Now make it beautiful.

SeedFlip gives you curated design systems β€” fonts, colors, shadows, the works β€” applied to a real page in one click. Export as CSS, Tailwind, or a complete DESIGN.md your agent actually understands.

β€œConsider me flipped.”

β€” @nikkimitss, Passive Studios

Flip β†’
Watch it work ↓

Works with your stack

104
CURATED SEEDS
98
PREMIUM FREE FONTS
7
EXPORT FORMATS
Aa
Real type pairings.
Google Fonts loaded live. Heading + body combos that actually work together β€” weights, spacing, and scale already dialed in. Not a font picker. A font decision.
β—‘
Complete color systems.
Background, surface, text, muted, accent, accent-soft, borders, gradients. Every seed has 10+ coordinated tokens. Not five swatches on a mood board. A system.
{ }
Ship-ready exports.
CSS Variables. Tailwind Config. Or a complete DESIGN.md that tells Cursor exactly what to build. Paste it. Watch it materialize. Take all the credit.
β€œ

β€œEvery AI app has the same auth flow, the same Stripe checkout, and the same shadcn components. Design is the last unfair advantage you haven't used yet.”

CURRENT SEED TYPOGRAPHY
Inter
Every seed pairs a heading and body font that actually belong together. Weights, spacing, and scale β€” already decided. You just flip.
LOCK & FLIP
Keep what you love. Flip the rest.
Lock any category β€” type, palette, shape, or atmosphere β€” and flip everything else. Thousands of combinations from 104 curated seeds. PRO
THE LAB
Extract the DNA.
Three ways to take your seed home. CSS Variables for purists. Tailwind Config for the utility-class faithful. Or DESIGN.md. A complete design system document your AI agent can follow from the first component. Paste it into Cursor. Watch a styled site materialize.
THE ARCHIVE
104 seeds. All killer. No filler.
Browse every design system in the collection. Dark, light, neon, editorial, brutalist, minimal β€” each one hand-curated with real Google Fonts and a full DESIGN.md. Your daily flip lands in your inbox every morning.
β€œ

I was mass-prompting Claude at 4am trying to describe the β€œvibe” I wanted. Turns out the vibe was 17 CSS variables I didn’t know existed.

J
Jamie K.
Indie Hacker
β€œ

Sent a SeedFlip export to my cofounder. His response was β€œwhy does our app look like a real company now.” We launched that week.

P
Priya S.
Technical Cofounder
β€œ

Tried the β€œmake my app look like Super Unicorn X, Y, Z” prompts. Didn’t work. This did. Wish I found it 12 projects ago.

M
Marcus C.
Design Engineer

Simple pricing.

Free gets you flipping. Pro gets you shipping.

Free
$0
forever
βœ“ Unlimited flips
βœ“ 104 curated seeds
βœ“ CSS Variables export
βœ“ Full Archive access
Start Flipping β†’
Pro
$19/mo
cancel anytime
Everything in Free, plus:
βœ“ Lock fonts, colors, shape & atmosphere
βœ“ DESIGN.md export
βœ“ Tailwind + shadcn/ui exports
Get Pro β†’

You're one flip away from looking like you hired a designer.

104 curated design seeds. Real fonts. Real color theory. AI-ready prompts that actually work. No Figma file. No design committee. No three-week sprint to pick a gray.

Flip β†’

Keystone is identity infrastructure made visible. The off-white background, the violet-purple accent, the aggressive tracking on bold headings. It's the design vocabulary of products that handle authentication, security, and trust. Your users are handing you their credentials. The interface better look like it deserves them.

Most developer-facing products default to cold blues and generic grays.

Keystone stands apart by threading a subtle purple undertone through everything. The text color. The muted tones. The accent. It all connects subliminally. You don't see it. You feel it. And that feeling is "this was built by people who obsess over details."

If you're shipping dev tools, AI products, or SaaS infrastructure, Keystone gives you the authority of a company that's been earning trust for a decade. Even if you launched last Tuesday.

The DNA.
Why Keystone works. Every decision, unpacked.
TYPOGRAPHY
Inter
Weight: 700
?
Β·Spacing: -0.03em
?
Β·Inter

Inter at bold weight with aggressive negative tracking is a power move. Tight tracking reads as precise. Bold weight reads as authoritative. Together, they create headings that feel like they were engineered, not typed. This is the typography of infrastructure companies.

Body text relaxes to regular weight with softer tracking. That contrast between the dense headings and the breathing body text is what makes the reading experience work. For documentation, dashboards, and landing pages, it creates a hierarchy that scans fast and reads clean.

PALETTE
background#F7F7F8
surface#FFFFFF
text#131316
muted#5E5F6E
accent#6C47FF
border#E4E4E7
?
Chart
?
Status
?
text / bg17.3:1 AA
?
accent / bg4.9:1 AA
?

The background isn't white. It's the faintest gray with a cool undertone. That tiny shift is everything. It turns pure white cards into elements that pop off the page without needing heavy shadows or borders.

Violet-purple is the accent doing the trust work. It's strong without being playful. Modern without being trendy. And the genius is how the purple undertone bleeds into the text and muted colors. The whole palette is quietly unified. Even the grays have a purple whisper in them. That's the kind of detail that makes users feel safe without knowing why.

SHAPE
4px
8px
16px
?
Tight rounding throughout. Nothing puffy, nothing aggressive. The real signature is the ring shadow technique. A one-pixel border ring gives every component a defined, card-like quality at rest. It's like a permanent focus state that makes everything feel considered and placed.
ATMOSPHERE
sm
?
md
?
Surface definition
?
Shadows are surgical. A soft drop paired with a ring border creates components that feel defined without being dramatic. Depth is precise. Elements don't float or hover. They sit in place with quiet confidence, like tiles in a well-organized grid.
Rip This.
Export Keystone as code, tokens, or a DESIGN.md for your AI agent.
/* Typography */
--font-heading: 'Inter', sans-serif;
--font-body: 'Inter', sans-serif;
--font-heading-weight: 700;
--letter-spacing: -0.03em;
/* Palette */
--color-bg: #F7F7F8;
--color-surface: #FFFFFF;
--color-text: #131316;
--color-text-muted: #5E5F6E;
--color-accent: #6C47FF;
--color-accent-soft: #F2EFFE;
--color-border: #E4E4E7;
/* Shape */
--radius: 8px;
--radius-sm: 4px;
--radius-xl: 16px;
/* Depth */
--shadow: 0 1px 3px rgba(0,0,0,0.06), 0 0 0 1px rgba(0,0,0,0.04);
--shadow-sm: 0 1px 2px rgba(0,0,0,0.04);

Drop your email to rip the full DNA.

Tailwind, shadcn/ui & DESIGN.md are Pro exports. Get Pro β†’
Share This.
Send Keystone to your team or post it to X.
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You@youΒ·just now
Vibe coded my app in days. Designed it in seconds. Flip. Rip. Ship. seedflip.co/seed/keystone
Inter
ABCDEFGHIJKLM
abcdefghijklm
0123456789 !@#
Body: Inter
✦ seedflip.co
#F7F7F8
#FFFFFF
#6C47FF
Aa
radius: 8px Β· Surface definition
seedflip.co
3
12
47
1.2K
IG PREVIEW
Typography
Inter
Identity infrastructure. Clean, precise, slightly purple.
in Inter 13pt
700 / -0.03em
Colors
Accent
#6C47FF
Surface
#FFFFFF
Text
#131316
Border
#E4E4E7
Shape & Atmosphere
Heading component
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor.
Action button
Keystone
Inter + Inter
seedflip.co
Typography
Inter
Identity infrastructure. Clean, precise, slightly purple.
in Inter 13pt
700 / -0.03em
Colors
Accent
#6C47FF
Surface
#FFFFFF
Text
#131316
Border
#E4E4E7
Shape & Atmosphere
Heading component
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor.
Action button
Keystone
Inter + Inter
seedflip.co
Typography
Inter
Identity infrastructure. Clean, precise, slightly purple.
in Inter 13pt
700 / -0.03em
Colors
Accent
#6C47FF
Surface
#FFFFFF
Text
#131316
Border
#E4E4E7
Shape & Atmosphere
Heading component
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor.
Action button
Keystone
Inter + Inter
seedflip.co
LINK
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Cursor Rules Design System→Design Tokens to IDE Rule Files→