Define
Choose a palette, a fixed font pairing and a layout that match the product. Name the role of every value instead of collecting unrelated styles.
Design systems for AI-built interfaces
Give the interface rules before the agent writes the screen.
Pixel Perfect turns a visual direction into named colours, type, spacing, layout and component instructions. The Design Bible explains the decisions. The Companion produces the files.
01 · The method
The problem is not a lack of prompts. It is a lack of decided visual rules.
When visual choices remain open, a coding agent often uses familiar defaults. Pixel Perfect records those choices before implementation and gives the result one source of truth.
Preview
See the system on a real interface composition before asking an agent to apply it across a project.
Export
Carry the same decisions into CSS variables, DESIGN.md, agent instructions, Tailwind configuration and design-token data.
Verify
Compare the rendered result with the declared system. A completed code task is not the same as a visually consistent interface.
02 · Clear boundary
Try the visual workflow before paying. The limits are stated plainly.
The public Companion contains a useful but restricted set. The paid file is delivered separately through Gumroad.
| Capability | Free Companion | Companion Pro · $12.99 |
|---|---|---|
| Colour systems | 3 palettes | All 7 palettes |
| Typography | 4 fixed pairings | All 12 fixed pairings |
| Layout | 3 compositions | All 6 compositions |
| Finish + detail | Preview controls only | 4 Atmospheres · 4 Finish + 5 Detail sliders |
| Output | CSS tokens | 7 output formats |
| Delivery | Runs on this website | Separate downloadable browser file |
03 · Products
Learn the system, generate the files, or take both.
Each product has one role. Every price is a one-time payment through Gumroad.
Companion Pro
All palettes, fixed font pairings, layouts, controls and seven export formats in one downloadable browser file.
$12.99 Buy the CompanionThe Design Bible
Fifteen chapters explaining colour roles, typography, spacing, layout, components, accessibility and agent instructions.
$20.00 Buy the bookComplete system
The Design Bible and Companion Pro together. Use the book to understand the decisions and the tool to produce the implementation files.
$24.99 Buy the complete system04 · Guard
A rule is useful only when the finished interface can be checked against it.
Guard Lite checks pasted CSS or HTML text against declared values. The analysis stays inside the browser.
- Input
- Your approved values and the code text you want to inspect.
- Method
- Five narrow checks covering colours, font families, font sizes, spacing and corner radius.
- Output
- Line-level findings with the declared value, the value found and a focused repair instruction.
- Limit
- It does not execute code, inspect a live website or prove complete accessibility and visual quality.
05 · Working guides
Use one system from the first design decision to the final browser check.
These guides contain downloadable files, implementation prompts and concrete repair steps. They are not keyword variations of the same article.
01
Build a useful DESIGN.md
What the file should contain, how it controls an agent and where its limits begin.
02Repair a generic AI-built interface
Seven changes for typography, colour roles, hierarchy, spacing, layout and component states.
03Give Cursor a controlled UI task
A scoped prompt and project-rule workflow that protects routes, logic and the agreed visual system.
04Read the Guard check library
Five rule definitions with measurable scope, common false positives and repair guidance.
Stop asking the agent to invent the visual system while it writes the code.
Define the direction once. Reuse the same decisions on every screen.
Get the complete system · $24.99