#64748b
#64748b is rgb(100, 116, 139), or hsl(215, 16%, 47%). The nearest reference Tailwind v4 token is slate-500 (#62748e), not an exact match.
Conversions
WCAG contrast
| Background | Ratio | AA text | AA large | AAA text |
|---|---|---|---|---|
| white | 4.76:1 | pass | pass | fail |
| black | 4.41:1 | fail | pass | fail |
| slate-900 | 3.75:1 | fail | pass | fail |
| gray-100 | 4.32:1 | 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 #64748b in real UI palettes
These colors appear alongside #64748b in StyleKit's curated palettes. Co-occurrence is not a promise of text readability; each pair includes its measured contrast.
- #3b82f6
Used together in Corporate Clean, Data Dense.
1.29:1
Not for normal text - #f8fafc
Used together in Corporate Clean, Data Dense.
4.55:1
AA normal text - #10b981
Used together in Corporate Clean.
1.88:1
Not for normal text - #1e40af
Used together in Corporate Clean.
1.83:1
Not for normal text - #22c55e
Used together in Data Dense.
2.09:1
Not for normal text - #ef4444
Used together in Data Dense.
1.26:1
Not for normal text
A readable starting point
white text on #64748b: 4.76:1 contrast.
Design styles using this color
Tints and shades
Lightness ladder in HSL space, from the lightest tint to the darkest shade of #64748b.
Similar colors in the library
Nearest swatches by perceptual OKLab distance across all curated style palettes.
AI prompt snippet
Use #64748b as the accent color, following the Corporate Clean style: rgb(100, 116, 139), nearest Tailwind token slate-500. Keep text contrast at least 4.5:1 (this color scores 4.76:1 on white, 4.41:1 on black).
Paste this into ChatGPT, Claude, Cursor, or v0 to use #64748b with correct contrast constraints. Browse all palette colors.
Questions about #64748b
What color is #64748b?
#64748b is rgb(100, 116, 139), or hsl(215, 16%, 47%). The nearest reference Tailwind v4 token is slate-500 (#62748e), not an exact match.
What text color should I use on #64748b?
White (#ffffff) has the higher black-or-white contrast against #64748b: 4.76:1. 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 #64748b in Tailwind CSS?
Use bg-[#64748b], text-[#64748b], 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.