#2451B4
Closest named color: Blue Blue (#2242C7). oklch(46.5% 0.165 263.1), rgb(36, 81, 180).
Aa
White text reads best on this color (7.21:1).
About this color
#2451B4 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.165 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.046 away. White text reads best on it, at 7.21:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.91:1 |
| White text | 7.21:1 |
Values
| HEX | #2451B4 |
| RGB | rgb(36, 81, 180) |
| HSL | hsl(221, 67%, 42%) |
| OKLCH | oklch(46.5% 0.165 263.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #2451B4 | 7.21:1 | AAA | Lc -89.4 | Fine for body text |
| Black text on #2451B4 | 2.91:1 | Fails | Lc 19.5 | Dividers and decoration only |
| #2451B4 text on white | 7.21:1 | AAA | Lc 84.5 | Fine for body text |
| #2451B4 text on black | 2.91:1 | Fails | Lc -17.5 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF7
oklch(88.5% 0.044 262.4)
-
Step 300
300
#A6C1F5
oklch(80.9% 0.08 263.3)
-
Step 400
400
#769FF0
oklch(70.7% 0.128 263.1)
-
Step 500
500
#5385EB
oklch(63.2% 0.163 262.9)
-
Step 600
600
#386CDA
oklch(55.7% 0.178 262.9)
-
Step 700
700 (this color)
#2451B4
oklch(46.5% 0.165 263.1)
-
Step 800
800
#254999
oklch(42.7% 0.138 263.5)
-
Step 900
900
#223E79
oklch(37.6% 0.106 263.2)
-
Step 950
950
#142547
oklch(27% 0.067 262.7)
#2451B4 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #005EB7 | 0.034 |
| Deuteranopia (no green cones) | #0051B2 | 0.018 |
| Tritanopia (no blue cones) | #00697A | 0.128 |
| Achromatopsia (no color) | #575757 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2451B4
#2451B4
oklch(46.5% 0.165 263.1)
- #735300
#735300
oklch(46.4% 0.095 82.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #2451B4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.046
- Sapphire #2138AB ΔE 0.062
- Cobalt #1E488F ΔE 0.064
- Dusk Blue #26538D ΔE 0.064
- Majorelle Blue #3F37C9 ΔE 0.067
- Blueberry #464196 ΔE 0.068
- Mid Blue #276AB3 ΔE 0.069
- Denim Blue #3B5B92 ΔE 0.069
Use #2451B4 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.