red green UI test

red green UI test: practical guide with Color Blindness Simulator

Critical states cannot depend only on red and green. This page explains when the use case makes sense, which parameters to control and how to avoid fragile visual-design decisions.

HEX colors

Simulation type

Original and simulated

#3DDC97

#E5C46B

#E07B8E

#4EA8DE

#F7F8F7

#796DAC

#D9DB86

#BAC288

#7069CE

#F7F7F7

#796DAC, #D9DB86, #BAC288, #7069CE, #F7F7F7

The palette is processed locally; no color or image is sent to the server.

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How to use this generator in the right context

Start with the visual goal: Check whether error and success remain distinguishable. If the output will be used in UI, test it alongside real content, contrast, interactive states and responsiveness.
Prefer reproducible parameters such as seed, numeric values and copyable SVG. This makes review, versioning and fine tuning easier in design systems or technical documentation.
Validate the result in its final destination. A texture that looks elegant alone may hurt readability; a harmonious color can fail accessibility; a perfect SVG may need optimization before production.

Practical configuration example

Recommended input

Input: #22c55e #ef4444 #f8fafc
Expected output: Swatches originais e simulados lado a lado

Use it as a starting point and tune in the preview until it matches the real layout.

Acceptance criterion

Input: Preview + exportação + revisão no contexto
Expected output: Asset claro, reprodutível e sem conflito com conteúdo

The tool speeds exploration; the final decision depends on readability, accessibility and visual consistency.

Full tool FAQ

Is color blindness simulation exact?

No. It approximates average perception with a mathematical model; real people vary in severity, adaptation and lighting context.

Which type of color blindness is most common?

Does WCAG contrast solve everything?

Can I use red and green together?

Does the tool analyze images?

How should I test charts?

Does simulation replace user testing?

Are colors sent to analytics?

Frequently asked questions

Can I use the output directly in production?

In many cases yes, but review SVG/CSS size, contrast, fallback and compatibility in the final environment.

Does the tool send my data to the server?

No. Generation happens in the browser; analytics events do not include typed content, specific colors or generated SVG.

How do I avoid thin visual output?

Use this page intent as a guide: define the function, validate context and document parameters to reproduce the result.