About Kolorvia
Why Kolorvia exists
Color work is scattered. Converting a hex code lives on one site, checking contrast on another, simulating color blindness on a third — each with its own ads, quirks, and quality. Kolorvia brings the whole workflow into one place: fast, accurate, browser-based tools that share the same color math, link into each other, and hand you clean code output at every step. The mechanical part of color should be instant, so the actual design decisions get your attention instead.
The whole platform, at a glance
13 tools today, organized the way you work. Every one is free, instant, and account-free.
13
Free tools
148
CSS color names
286
Tailwind shades
19
Curated palettes
8
Guides published
0
Accounts required
What we believe
Browser-first
Conversions, palettes, and simulations run locally in your browser. When you drop an image into the color picker or the color blindness simulator, it is processed on your machine and never uploaded anywhere — there is no server that could keep it.
Accurate, verifiably
Industry-standard formulas — WCAG contrast, CIEDE2000 color difference, OKLab mixing — implemented from their specifications and covered by an automated test suite. The section below explains exactly how.
Free, with no gates
Every tool is free, with no usage limits, no sign-up walls, and no “pro” tier holding back the useful parts. Use it, bookmark it, share it.
Focused by design
Each page does one job well, explains the concepts behind it honestly, and links to the next tool in your workflow — no dark patterns, no fake urgency, no invented statistics.
How we keep the colors honest
Reference data on Kolorvia is generated from source, not retyped. The Tailwind shades in the color chart are read directly from the Tailwind CSS package itself, and the CSS color names come from the standard keyword list — so a typo in a hex value is structurally impossible.
The color math is held to the same bar. Our CIEDE2000 implementation is validated against the published Sharma–Wu–Dalal test pairs that the color-science community uses to verify conformance; contrast ratios follow the WCAG 2 formula exactly; and the color blindness simulations use the standard Brettel/Viénot linear-RGB matrices. Every formula runs identically in the browser and on the server, and an automated test suite checks all of it on every change.
Just as important is what we don’t do: no invented popularity numbers, no fake “trending” lists, no compatibility claims we haven’t verified. Where a value is an approximation — like CMYK conversions without a print profile, or quantized color counts in the image picker — the page says so.
Who Kolorvia is for
🎨 Designers
Build palettes from a brand color, blend perceptually even scales, and extract schemes from reference images — then export to CSS, SCSS, or Tailwind. Start with the palette generator.
💻 Developers
Convert between formats, grab utility classes from the Tailwind chart, and generate gradients as CSS, SVG, or Flutter code. Start with the converter or the color chart.
♿ Accessibility specialists
Audit contrast against WCAG AA/AAA, simulate all eight color vision deficiency types on colors and full screenshots, and verify that state pairs stay distinguishable. Start with the contrast checker.
🎓 Students & the curious
Every tool doubles as a lesson — the color wheel teaches harmony geometry, the Delta E calculator explains perceptual distance, and the guides go deeper. Or just play Color Match and build hex intuition daily.
Our accessibility commitment
A site with a contrast checker should pass its own test. Kolorvia is built to WCAG AA: real text contrast in both light and dark themes, keyboard-operable tools, labeled controls, and honest fallbacks when JavaScript is unavailable. If you hit something that doesn’t hold up that bar, tell us — accessibility reports jump the queue.
What’s next
Kolorvia is actively developed. High on the list: whole-palette accessibility analysis (checking every pair in a palette against color vision deficiencies at once), more export formats for design systems, newer contrast models alongside WCAG 2, and more in-depth guides. No dates promised — things ship when they meet the same bar as everything else here.
See it for yourself
The fastest way to understand Kolorvia is to use it — pick any color and follow the links between tools.