Tetradic / Rectangle Color Generator
Generate 4-color tetradic (rectangle) and square colour schemes from any base colour. Switch between Square mode (90° intervals) and Rectangle mode (adjustable offset) to create perfectly balanced harmonious palettes. Each colour shows HEX, RGB, and HSL values with a colour wheel visualisation, palette bar, and practical usage tips. Fully private, 100% free, and no signup required.
Sample Colors
Square Scheme (90° Apart)
Primary
Dominant - Base color for the scheme
Primary
Dominant - Base color for the scheme
Secondary
Accent - Creates contrast and visual interest
Tertiary
Complement - Balances the primary color
Quaternary
Accent 2 - Completes the 4-color harmony
Primary (Base)
Primary
Secondary
Tertiary
Quaternary
Usage Tips
Use the Primary color as your dominant brand or background color - it sets the overall tone.
Apply the Secondary color (90°) for interactive elements like buttons, links, and highlights to create clear visual hierarchy.
Use the Tertiary color (180°, complement) sparingly - as an accent for errors, warnings, or important call-to-actions that need maximum attention.
The Quaternary color (270°) works well for subtle UI elements, borders, dividers, or secondary information panels.
TIP: Square schemes work best when you let one color dominate (60%), use a second as support (30%), and reserve the remaining two as accents (10%).
Why Use Our Tetradic Color Generator?
Instant 4-Color Harmony Generation
The Tetradic Color Generator instantly creates a perfectly balanced 4-colour scheme from any base colour. Switch between Square (90° intervals) and Rectangle (adjustable complementary pairs) modes with all swatches updating in real time as you type or pick a colour.
Square & Rectangle Modes
Choose between Square mode for evenly spaced 90° intervals with maximum visual energy, or Rectangle mode with an adjustable offset slider (10°-170°) to fine-tune the harmonic tension between your two complementary colour pairs.
100% Private - No Upload
All colour scheme generation happens locally in your browser. Your colour values never leave your device and are never sent to any server - safe for proprietary brand palettes and client-facing design work.
Free & Unlimited Schemes
Generate unlimited 4-colour schemes with no signup, no subscription, and no usage caps. The Tetradic Color Generator is completely free forever with no ads blocking the interface.
Common Use Cases for Tetradic Color Generator
Brand Identity & Logo Design
Brand designers use the Tetradic Color Generator to create complex, sophisticated brand colour palettes. The 4-colour tetradic system provides enough variety for a complete brand ecosystem - primary, secondary, accent, and highlight colours that all work harmoniously together.
UI/UX Design Systems
UI designers rely on the Tetradic Color Generator to build comprehensive design system colour tokens. The Square and Rectangle modes produce balanced palettes suitable for backgrounds, text, interactive elements, borders, and accent states across web and mobile interfaces.
Website & Dashboard Design
Web designers use the Tetradic Color Generator to create colour schemes for complex interfaces like dashboards, analytics platforms, and data visualisation tools where multiple distinct colours are needed while maintaining visual harmony.
CSS Custom Properties Export
Frontend developers use the Tetradic Color Generator to produce ready-to-use colour palettes with HEX, RGB, and HSL values. Each colour can be copied individually, or the complete scheme with usage notes can be copied at once for integration into CSS custom properties or Tailwind configurations.
Print & Editorial Design
Print designers use the Tetradic Color Generator to develop multi-colour layouts for magazines, brochures, and posters. The 4-colour system provides enough depth for headings, body text, pull quotes, and decorative elements without overwhelming the page.
Interior & Product Design
Product and interior designers use the Tetradic Color Generator to create colour schemes for physical spaces and products. The Rectangle mode is particularly useful here, where two complementary pairs can represent primary and accent colour families in a room or product line.
Understanding Tetradic & Rectangle Color Schemes
What is a Tetradic Color Scheme?
A tetradic colour scheme uses four colours arranged into two complementary pairs on the colour wheel. There are two main types: the Square scheme, where all four colours are evenly spaced 90° apart, and the Rectangle scheme (also called tetradic), where the colours form two complementary pairs at a user-defined offset angle. Our Tetradic Color Generator makes it easy to create and experiment with both types.
Tetradic schemes are among the most complex and versatile colour harmonies. They provide rich, vibrant palettes with plenty of variety while maintaining balance through the complementary pair structure. However, they require careful execution - using all four colours at equal intensity can feel chaotic. The key is letting one colour dominate while the others serve as accents.
How Our Tetradic Color Generator Works
- Enter your base colour: Type or paste a HEX colour value, or use the native colour picker to select any colour visually. The generator will use this as the starting point for the tetradic scheme, adjusting saturation and lightness as needed for optimal colour richness.
- Choose Square or Rectangle mode: In Square mode, the generator creates four colours at exactly 90° intervals (base, +90°, +180°, +270°). In Rectangle mode, you can adjust the offset angle using a slider - the scheme creates two complementary pairs: (base, base+180°) and (base+offset, base+180°+offset).
- Explore and copy: Each colour is displayed as a large swatch with HEX, RGB, and HSL values. A colour wheel arc shows where each colour sits on the wheel. Usage tips provide practical guidance for combining the colours in real projects. Copy any value individually or the entire scheme at once.
Square vs. Rectangle Schemes
- Square (90°): Four colours evenly spaced at 90° intervals. This creates a balanced, energetic scheme where no single colour dominates through proximity. Square schemes are excellent for UI design because they naturally provide a primary, secondary, accent, and subtle colour that all feel related.
- Rectangle (adjustable offset): Two complementary pairs with a user-defined offset angle. A smaller offset (10°-45°) creates tighter, more subtle harmony between the pairs. A wider offset (90°-150°) creates more dramatic contrast. Rectangle schemes are ideal when you need more nuanced colour relationships.
- When to use each: Choose Square when you need maximum colour variety with guaranteed balance - ideal for dashboards, charts, and multi-colour interfaces. Choose Rectangle when you have specific colour requirements and need to fine-tune the relationships between your two complementary pairs.
Privacy, Security & Availability
100% browser-based processing: Our Tetradic Color Generator processes all colour calculations entirely within your browser. Your colour values are never uploaded, stored, or transmitted to any server. This ensures complete privacy for confidential brand colour specifications and design projects.
Always available: Since the generator works entirely client-side, it continues to function even without an internet connection after the page loads. There are no server dependencies, no rate limits, and no API calls. Generate unlimited colour schemes anywhere, anytime.
Related Color Tools
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Analogous Color Scheme Generator
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Color Harmonies Explorer
Interactive colour wheel - click any position to explore complementary, analogous, triadic, tetradic, and monochromatic colour harmonies with CSS variables export.
Color Picker & Converter
Visual colour picker with HEX, RGB, HSL, HSV, CMYK, HWB, and CIE LAB conversion. Bidirectional inputs with WCAG contrast checker and CSS variable output.
Frequently Asked Questions About Tetradic Color Generator
A Tetradic Color Generator creates 4-colour harmonious colour schemes based on the tetradic colour harmony rule. It generates two types of schemes: Square (colours evenly spaced at 90° intervals on the colour wheel) and Rectangle (two complementary pairs with an adjustable offset angle). Each colour is displayed with HEX, RGB, and HSL values along with usage tips for practical application.
Square schemes space all four colours exactly 90° apart on the colour wheel, creating maximum visual energy and balance. Rectangle schemes use two complementary pairs with an adjustable offset angle - for example, with a 60° offset, the colours are at 0°, 60°, 180°, and 240°. Rectangle gives you more control over the harmonic relationships and lets you create subtler or more dramatic contrasts between the colour pairs.
The key to using a tetradic scheme is balance and proportion. Let one colour dominate (about 60% of the design), use a second colour for support (30%), and reserve the remaining two colours as accents (10% combined). Avoid using all four colours at equal intensity. Our Tetradic Color Generator provides specific usage tips for each generated scheme to help you apply the colours effectively.
Yes. All colour scheme generation happens entirely within your browser using JavaScript. Your colour values are never sent to any server, never stored, and never transmitted anywhere. The Tetradic Color Generator is completely private and processes everything locally on your device.
The Tetradic Color Generator accepts HEX colour values in both 3-digit (#RGB) and 6-digit (#RRGGBB) formats. You can type the value with or without the # prefix. The tool also includes a native colour picker for visual colour selection and preset swatches for quick testing of common colours.
The best offset angle depends on the look you want to achieve. Smaller offsets (10°-45°) create tighter, more subtle harmony and work well for elegant, refined designs. Medium offsets (45°-90°) provide good contrast while maintaining balance - the most versatile range. Wider offsets (90°-170°) create dramatic, high-contrast schemes ideal for bold, attention-grabbing designs. Experiment using the slider to see how the colours shift in real time.
The 60-30-10 rule is a timeless design principle for applying colour in balanced proportions. In a tetradic scheme, use your dominant colour for 60% of the design (usually backgrounds or main areas), a secondary colour for 30% (headings, navigation, or supporting elements), and the remaining two colours as 10% accents (buttons, links, highlights, or calls to action). This prevents the four-colour scheme from feeling chaotic.
Yes. The Tetradic Color Generator is 100% free with no signup required, no premium features, and no usage limits. Generate unlimited colour schemes without any restrictions or hidden costs. There are no ads blocking the interface, and the tool works entirely in your browser without any server communication.