#6366f1
#6366f1 is rgb(99, 102, 241), or hsl(239, 84%, 67%). The nearest reference Tailwind v4 token is indigo-500 (#615fff), not an exact match.
Conversions
WCAG contrast
| Background | Ratio | AA text | AA large | AAA text |
|---|---|---|---|---|
| white | 4.47:1 | fail | pass | fail |
| black | 4.70:1 | pass | pass | fail |
| slate-900 | 4.00:1 | fail | pass | fail |
| gray-100 | 4.06:1 | fail | pass | fail |
Ratios use WCAG relative luminance for opaque sRGB colors. Normal text requires 4.5:1, or 7:1 at AAA. Large text requires 3:1: at least 24 CSS pixels, or about 18.67 CSS pixels when bold. Pass/fail uses the unrounded ratio. Contrast alone is not a full accessibility assessment.
Colors paired with #6366f1 in real UI palettes
These colors appear alongside #6366f1 in StyleKit's curated palettes. Co-occurrence is not a promise of text readability; each pair includes its measured contrast.
- #ec4899
Used together in Full Page Scroll, Soft UI and 2 more styles.
1.27:1
Not for normal text - #f59e0b
Used together in Dashboard Layout, Full Page Scroll and 2 more styles.
2.08:1
Not for normal text - #10b981
Used together in Dashboard Layout, Soft UI and 1 more styles.
1.76:1
Not for normal text - #ffffff
Used together in Full Page Scroll, Z-Pattern Layout.
4.47:1
Not for normal text - #000000
Used together in Full Page Scroll.
4.70:1
AA normal text - #00d4ff
Used together in Holographic.
2.52:1
Not for normal text
A readable starting point
black text on #6366f1: 4.70:1 contrast.
Design styles using this color
Tints and shades
Lightness ladder in HSL space, from the lightest tint to the darkest shade of #6366f1.
Similar colors in the library
Nearest swatches by perceptual OKLab distance across all curated style palettes.
AI prompt snippet
Use #6366f1 as the accent color, following the Dashboard Layout style: rgb(99, 102, 241), nearest Tailwind token indigo-500. Keep text contrast at least 4.5:1 (this color scores 4.47:1 on white, 4.7:1 on black).
Paste this into ChatGPT, Claude, Cursor, or v0 to use #6366f1 with correct contrast constraints. Browse all palette colors.
Questions about #6366f1
What color is #6366f1?
#6366f1 is rgb(99, 102, 241), or hsl(239, 84%, 67%). The nearest reference Tailwind v4 token is indigo-500 (#615fff), not an exact match.
What text color should I use on #6366f1?
Black (#000000) has the higher black-or-white contrast against #6366f1: 4.70:1. This calculation assumes opaque, flat sRGB colors. Normal text requires 4.5:1 and large text 3:1 under WCAG 2.2 SC 1.4.3; it is not a complete accessibility assessment.
How can I use exactly #6366f1 in Tailwind CSS?
Use bg-[#6366f1], text-[#6366f1], or a CSS custom property instead of substituting a nearby named token. The reference palette is Tailwind CSS 4.1.18, converted from OKLCH to sRGB hex; newer Tailwind versions and custom themes can differ.
Sources and calculation limits
Reference palette: Tailwind CSS 4.1.18, converted from OKLCH to sRGB hex. Named tokens are versioned approximations; use the exact hex utilities when matching an existing design. Palette pairings come from the linked StyleKit definitions, not external popularity or preference data.