Calculator Tools

Calculate dates, ages, timestamps, units and measurements with compact utilities designed for quick repeat use.

Calculator Tools overview

Convert HEX, RGB and HSL, test WCAG contrast, generate palettes, gradients and CSS variables.

Convert HEX, RGB and HSL, test WCAG contrast, generate palettes, gradients and CSS variables. Common workflows run in the browser where the required browser APIs are available, helping you work quickly without creating an account.

Choose the right tool

Tool	Best for	Open
Color Converter	Convert colors between HEX, RGB and HSL with live swatches.	Open tool
Contrast Checker	Check color contrast ratios for accessible text and user interfaces.	Open tool
Palette Generator	Generate harmonious color palettes from a base color.	Open tool
CSS Gradient Generator	Create linear gradients and copy production-ready CSS.	Open tool
CSS Color Variables	Generate CSS custom properties from palette colors.	Open tool

What you can do

Open a focused utility for the exact task.
Review the input and result in the same browser workflow.
Copy or download supported results after checking them.
Move to a related tool without searching again.

A practical browser-first workflow

Choose the most specific tool for the task, review its options, run it and verify the result before using the output elsewhere.

For important work, verify the selected options and inspect the output before copying, downloading or publishing it. Bookmark the exact tool page when you expect to repeat the same task.

All tools

Browse all calculator tools

Design Tools Color Converter Convert colors between HEX, RGB and HSL with live swatches. Design Tools Contrast Checker Check color contrast ratios for accessible text and user interfaces. Design Tools Palette Generator Generate harmonious color palettes from a base color. Design Tools CSS Gradient Generator Create linear gradients and copy production-ready CSS. Design Tools CSS Color Variables Generate CSS custom properties from palette colors.

Calculator Tools FAQ

What is included in Design Tools?

Design Tools includes Color Converter, Contrast Checker, Palette Generator, CSS Gradient Generator, CSS Color Variables.

Are Design Tools free?

Yes. UtilKit category pages link to free utilities that run in a modern browser without requiring an account.

How do I choose the right Design Tools tool?

Start with the page that names your exact task, compare its description with the other tools in the category, then use nearby toolkit tabs only when you need a related follow-up action.

Do category tools upload data?

The utilities are designed around client-side processing wherever browser APIs support it, keeping common text, image, code and calculation tasks local.

Can I bookmark individual tools?

Yes. Every important function has a direct URL for repeat use.

Are results always production ready?

No tool can understand every project context. Review important results for formatting, units, meaning and privacy before publishing or deploying them.