#0000ff
#0000ff is rgb(0, 0, 255), or hsl(240, 100%, 50%). The nearest reference Tailwind v4 token is blue-700 (#1447e6), not an exact match.
Conversions
WCAG contrast
| Background | Ratio | AA text | AA large | AAA text |
|---|---|---|---|---|
| white | 8.59:1 | pass | pass | pass |
| black | 2.44:1 | fail | fail | fail |
| slate-900 | 2.08:1 | fail | fail | fail |
| gray-100 | 7.81:1 | pass | pass | pass |
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 #0000ff in real UI palettes
These colors appear alongside #0000ff in StyleKit's curated palettes. Co-occurrence is not a promise of text readability; each pair includes its measured contrast.
- #000000
Used together in Anti-Design, Bauhaus and 2 more styles.
2.44:1
Not for normal text - #ff0000
Used together in Anti-Design, Bauhaus and 2 more styles.
2.15:1
Not for normal text - #ffffff
Used together in Anti-Design, Bauhaus and 2 more styles.
8.59:1
AA normal text - #ffff00
Used together in Anti-Design, Geometric Bold.
8.00:1
AA normal text - #008000
Used together in Brutalist Web.
1.67:1
Not for normal text - #00ff00
Used together in Anti-Design.
6.26:1
AA normal text
A readable starting point
white text on #0000ff: 8.59:1 contrast.
Design styles using this color
Tints and shades
Lightness ladder in HSL space, from the lightest tint to the darkest shade of #0000ff.
Similar colors in the library
Nearest swatches by perceptual OKLab distance across all curated style palettes.
AI prompt snippet
Use #0000ff as the accent color, following the Anti-Design style: rgb(0, 0, 255), nearest Tailwind token blue-700. Keep text contrast at least 4.5:1 (this color scores 8.59:1 on white, 2.44:1 on black).
Paste this into ChatGPT, Claude, Cursor, or v0 to use #0000ff with correct contrast constraints. Browse all palette colors.
Questions about #0000ff
What color is #0000ff?
#0000ff is rgb(0, 0, 255), or hsl(240, 100%, 50%). The nearest reference Tailwind v4 token is blue-700 (#1447e6), not an exact match.
What text color should I use on #0000ff?
White (#ffffff) has the higher black-or-white contrast against #0000ff: 8.59:1. 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 #0000ff in Tailwind CSS?
Use bg-[#0000ff], text-[#0000ff], 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.