#51669E
Closest named color: French Blue (#436BAD). oklch(51.9% 0.093 267.5), rgb(81, 102, 158).
Aa
White text reads best on this color (5.60:1).
About this color
#51669E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.093 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.028 away. White text reads best on it, at 5.60:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.74:1 |
| White text | 5.60:1 |
Values
| HEX | #51669E |
| RGB | rgb(81, 102, 158) |
| HSL | hsl(224, 32%, 47%) |
| OKLCH | oklch(51.9% 0.093 267.5) |
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 #51669E | 5.60:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #51669E | 3.74:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #51669E text on white | 5.60:1 | AA | Lc 77.9 | Fine for body text |
| #51669E text on black | 3.74:1 | AA large text | Lc -23.8 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B4C0DE
oklch(80.8% 0.044 268.1)
-
Step 400
400
#8DA0CE
oklch(70.8% 0.071 267.1)
-
Step 500
500
#7187C1
oklch(63% 0.092 267.8)
-
Step 600
600
#5A71AE
oklch(55.7% 0.099 267.5)
-
Step 700
700 (this color)
#51669E
oklch(51.9% 0.093 267.5)
-
Step 800
800
#3C4D79
oklch(42.7% 0.077 267.1)
-
Step 900
900
#344062
oklch(37.7% 0.061 268.6)
-
Step 950
950
#1E2639
oklch(27% 0.037 266.4)
#51669E 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) | #516BA0 | 0.014 |
| Deuteranopia (no green cones) | #49649D | 0.012 |
| Tritanopia (no blue cones) | #32727A | 0.084 |
| Achromatopsia (no color) | #686868 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51669E
#51669E
oklch(51.9% 0.093 267.5)
- #7F651E
#7F651E
oklch(51.9% 0.093 87.9)
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 #51669E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.028
- Dusky Blue #475F94 ΔE 0.028
- Muted Blue #3B719F ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.040
- Denim #3B638C ΔE 0.041
- Dull Blue #49759C ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.047
- Mid Blue #276AB3 ΔE 0.049
Use #51669E 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.