SaturnAI Design Tools · free
Describe what you’re making. Explore a direction grounded in real references, then take the brief to your assistant.
577 cards · Free, with no paid tier
Connect by URL, MCP, or HTTP. Your assistant does the building and browser checks.
Looking for the desktop workspace? Meet SaturnAI Desktop ↗
Get a direction, inspect its sources, then copy or download a brief for your assistant. Your project constraints come first. No account needed.
A reference library for the assistant you already use.
Find your setup path ↗01 · the loop
For new or substantial work, intake resolves the context, compose proposes one direction, and review checks the evidence after the build. Focused edits can use existing context without repeating intake.
Turns your words, known project context, and prior answers into a 20-field ledger. Your assistant asks only about consequential unknowns and uses delegated judgment for routine choices. When the fields are resolved, it returns a builder prompt for a small working version to check and refine.
Returns one named direction with typed constraints and DTCG tokens, plus premium_stack:
the technique ladder for the brief’s surface — required slots with alternatives, recommended reaches,
and the priced-in decoration to refuse. Your assistant summarizes the direction and its relevance
before building. Your explicit requirements and existing project constraints take precedence over
technique defaults. Never clone one card.
Checks measurements your assistant collects from the rendered page — contrast, layout, technique depth, and decoration — and returns PASS, REVISE, or REJECT with findings and required fixes. It does not browse the page, inspect screenshots, test interactions, or verify reviewer independence. Your assistant must inspect desktop and mobile output and exercise the primary path separately.
Use techniques suited to the brief and available platform, and explain deviations from required slots. The service is free; selected models, hosting, and integrations may have their own costs.
02 · the verdict — real receipts
After a build, your assistant runs collect-evidence.js in the rendered page — computed colours,
contrast maths, layout logic, technique probes — and posts the measurements to review. What comes
back is the object below. These two were issued against the engine’s own review fixtures on the date each
card names; the rubric rows, the scores and the evidence lines are verbatim.
100% evidence coverage · 5 contrast pairs measured, lowest 6.09:1 · no slop tell fired · 10 technique slots proven, 4 declared, 0 missing
No blocker. Every check that could run, ran.
100% evidence coverage · 2 contrast pairs measured, lowest 18.43:1 · 7 hard slop tells (purple_gradient_default, priced_in_aos_fadeup, priced_in_particles_bg) · 0 technique slots proven, 0 declared, 14 missing
4 blockers: 7 hard slop tell(s) · 1 failed checklist item(s) · logo test failed · 14 unmet premium-stack slot(s): a11y-gate, audit, color-system, cwv-gate, fonts, framework, images, lcp-priority, motion-a11y, navigation-feel, prerender, scroll-choreography, type-motion, type-precision
Scope of these examples: these are rule checks on supplied evidence. The service did not browse the page, inspect screenshots, or verify reviewer independence. A missing check is reported as NOT_ASSESSED and can block a PASS — it never grants one.
Works with your assistant
Start with a prompt, connect over MCP, or call the HTTP API. Choose the setup that fits your tools.
04 · what is inside
The 497 studies are apps, brands, patterns, movements, platforms, recipes, copy systems, offers and growth loops — each written up as what to steal and what to avoid, with the failure modes people usually miss. The 80 technique cards each carry dated browser support, a build recipe, a fallback, and the probe that proves the technique is actually in the page.
05 · access
These free Design Tools work with an assistant you already use. For the SaturnAI desktop workspace, release details, and planned project workflow, visit saturnai.dev.