About one in twelve men and one in two hundred women see colour differently. Drop in a design, a chart or a logo and see it as five different viewers would, side by side, before you ship it.

Runs in your browser. Nothing you add is uploaded or stored.

Drop a design, chart or logo herePNG, JPEG, WebP or GIF. It stays on your device.

Choose image

Pick an image or press Try a sample to see five views at once. Look for places where two things that differ in colour become hard to tell apart: that is where you add a label, an icon or a pattern.

Contrast Lab

Check any two colours against WCAG AA and AAA, see real text at real sizes, and get the nearest colour that passes.

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Password Forge

Strong passwords and passphrases made with your browser's secure random generator, with an honest strength reading.

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The lab is where we experiment. If you need something made specifically for your business, that is the rest of what we do.

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Meet Brook

Brook AI AssistantOnline · K4O5 Studio

Hi 👋 I'm Brook, K4O5's AI assistant.
Ask me about our services, pricing, or how we can help elevate your brand.

Hi 👋 I'm Brook. Ask me anything about K4O5 or your next project.