Color Converter (HEX/RGB/HSL)
Convert between HEX, RGB, HSL, and CMYK colour formats instantly. Includes a visual colour picker and CSS-ready output.
The Designer's Knife for Designer / Creatives
Nine design tools plus a live showroom — offline and always ready
Design and brainstorm without subscriptions. The Designer's Knife gives designer / creatives 9 specialised tools in a single HTML file that runs entirely offline.
The Designer's Knife puts nine essential design utilities plus a live preview Showroom into a single HTML file. Convert between color formats, check WCAG contrast compliance, build harmonious palettes, generate CSS gradients (linear, radial, conic), edit Bézier curves visually, build typographic scales from modular ratios, calculate spacing systems (linear, powers, Fibonacci), paint pixel art on a grid, and preview everything together in the Showroom — a live component gallery that renders your design system as buttons, cards, and typography in real time. All offline, all private, all yours forever.
WHAT'S INSIDE
9 tools in a single HTML file
WCAG Contrast Checker
Test foreground/background colour pairs against WCAG 2.1 AA and AAA contrast requirements. See pass/fail for normal and large text.
Palette Builder
Generate harmonious colour palettes — complementary, analogous, triadic, split-complementary, monochromatic, and tetradic — from any starting colour.
Gradient Generator
Build linear, radial, and conic CSS gradients visually. Add colour stops, adjust angles, and copy the CSS with one click.
HOW IT WORKS
Three steps. No setup.
1
Download the file
Purchase The Designer's Knife and download a single HTML file. No installer, no account, no setup.
2
Open in any browser
Double-click to open in Chrome, Firefox, Safari, or Edge. Works on any operating system.
3
Start working
Your data stays in your browser's local storage. Nothing is uploaded. Ever.
COMPLIANCE & GEOGRAPHY
Global
Works in any country. No server dependency, no regional restrictions.
FAQ
Frequently Asked Questions
Why should Designer / Creatives use The Designer's Knife?
The Designer's Knife is built for designer / creatives who need design & creative tools without cloud dependencies. Color converter, WCAG contrast checker, palette builder, gradient generator, Bézier editor, type scale, spacing calculator, pixel grid painter, and a live Showroom that previews your entire design system. Your design toolkit in one file.
Does The Designer's Knife work offline?
Yes. The Designer's Knife is a single HTML file that runs entirely in your browser. No internet connection required. Your data never leaves your machine.
Is The Designer's Knife a subscription?
No. The Designer's Knife is a one-time purchase ($39). No monthly fees, no renewals, no price increases.
What tools are included in The Designer's Knife?
The Designer's Knife includes 9 tools: Color Converter (HEX/RGB/HSL), WCAG Contrast Checker, Palette Builder, Gradient Generator, Bézier Curve Editor, Type Scale Builder, Spacing Calculator, Pixel Grid Painter, ✦ The Showroom. All accessible from a single HTML file.
Can I try The Designer's Knife before buying?
Yes. Every product page includes an interactive demo you can try in your browser. No signup required.
No cloud One fileOne-time purchase
Get The Designer's Knife — $39Sovereignty as a Service