Duotone Palette Builder
Pair shadow and highlight colors for duotone treatments.
Pair colors for duotone
A duotone treatment maps an image or design to two colors — one for shadows, one for highlights — for a bold, cohesive look. Choosing a pair that reads well is the hard part. This builder helps you select a shadow and highlight color and preview them together.
Seeing the two colors as a pair, rather than in isolation, tells you whether the duotone will feel striking or muddy. Lock in a combination and copy the hex values to apply the effect in CSS, a design tool, or an image editor.
Accurate and private
Everything runs locally in your browser using standard web APIs — nothing is uploaded, logged, or stored on any server — so the tool works offline, responds instantly, and keeps whatever you paste in on your own device. That makes it safe to use even for confidential, client, or internal data you would never send to an unknown website.
Frequently Asked Questions
What does the duotone palette builder do?
It pairs a shadow color and highlight color and returns CSS variables plus a preview gradient.
Can I use the output in production?
Yes. Review the generated values, then copy the CSS, color list, or text output into your design system or project files.
Does this upload my colors or images?
No. The tool runs in your browser. Uploaded images are read locally and are not sent to a server.
Is this tool free?
Yes. It is free to use and does not require an account.
Need a polished visual system? Bushe can help turn rough ideas into production-ready design.