Consistency over novelty
Spacing snaps to a grid and type follows a fixed scale, so screens match instead of drifting apart.
Bringing order to AI-generated frontend code.
A design system platform for AI-assisted frontend development
Constrainly turns your color, type, spacing, radius, and shadow decisions into one source of truth for AI coding tools — so every screen generated by AI stays consistent and on-brand.
Our mission
Consistency is the hardest part of UI — so we made it the default.
AI writes UI fast, but visual consistency breaks quickly. Colors drift, spacing becomes arbitrary, and components stop feeling related.
We built Constrainly to close that gap. Instead of relying on AI to remember your design rules, you define them once as structured design tokens and export them as strict, machine-readable constraints — a shared vocabulary both humans and AI tools follow, so the work that ships looks like it came from one deliberate, well-run design system.
The problem
The problem we're solving.
AI tools don't fail at writing code — they fail at staying consistent. These are the patterns we see break design systems again and again.
Spacing drift
Arbitrary padding and margins pile up, so layouts lose their rhythm.
Typography inconsistency
Missing hierarchy and random font sizes quietly erode readability.
Hardcoded color
One-off hex values replace tokens, breaking theming and dark mode.
What we believe
Principles behind Constrainly.
Tokens as the source of truth
Change a token like --color-primary once and every button, badge, and border updates with it.
Preview-first
See each change on real components as you make it — no exporting first to find out it broke.
AI-ready by design
Exports are strict rules — ‘use --color-primary, never raw hex’ — not hints a model can ignore.
How it fits together
From design decisions to AI-ready constraints.
A straightforward workflow that turns your design choices into rules every tool can follow.
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1
Define tokens
Set your colors, type scale, spacing, radius, and shadows in focused builders.
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2
Preview
See your tokens applied across real components before anything is exported.
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3
Export
Generate clean CSS, JSON, and AI-ready instructions from one source of truth.
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4
Use in AI tools
Feed the constraints into Claude, Cursor, or GPT for consistent UI every time.
What we're building
A focused toolkit for the foundations that matter.
We're starting with the primitives AI tools get wrong most often. Each builder works on its own, but feeds one shared token system.
Color systems
Semantic, themeable palettes with light and dark modes.
Typography scales
Responsive, mathematically consistent type hierarchy.
Spacing systems
A structured scale that keeps layouts in rhythm.
Radius systems
Personality-first corner styles, from sharp to pill.
Shadow systems
Elevation-driven shadows, from subtle cards to modals.
Design language export
CSS, JSON, and AI-ready instructions from one source of truth.
Build a design system your AI tools can't break.
Generate your design tokens, preview them on real components, and export AI-ready constraints that keep every generated screen consistent.