#51669A
Closest named color: Dusky Blue (#475F94). oklch(51.6% 0.087 266.7), rgb(81, 102, 154).
Aa
White text reads best on this color (5.64:1).
About this color
#51669A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.087 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.026 away. White text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.71:1 |
| White text | 5.64:1 |
Values
| HEX | #51669A |
| RGB | rgb(81, 102, 154) |
| HSL | hsl(223, 31%, 46%) |
| OKLCH | oklch(51.6% 0.087 266.7) |
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 #51669A | 5.64:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #51669A | 3.71:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #51669A text on white | 5.64:1 | AA | Lc 78.2 | Fine for body text |
| #51669A text on black | 3.71:1 | AA large text | Lc -23.6 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B4C1DD
oklch(81% 0.042 265.7)
-
Step 400
400
#8DA0CB
oklch(70.7% 0.067 266.1)
-
Step 500
500
#7288BE
oklch(63.1% 0.086 266.9)
-
Step 600
600
#5A71AA
oklch(55.5% 0.093 266.7)
-
Step 700
700 (this color)
#51669A
oklch(51.6% 0.087 266.7)
-
Step 800
800
#3D4D77
oklch(42.6% 0.073 267.4)
-
Step 900
900
#344160
oklch(37.8% 0.056 266.4)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#51669A 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) | #536B9C | 0.015 |
| Deuteranopia (no green cones) | #4B6499 | 0.010 |
| Tritanopia (no blue cones) | #357179 | 0.077 |
| Achromatopsia (no color) | #676767 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51669A
#51669A
oklch(51.6% 0.087 266.7)
- #7E6425
#7E6425
oklch(51.7% 0.087 86.2)
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 #51669A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.026
- French Blue #436BAD ΔE 0.033
- Muted Blue #3B719F ΔE 0.036
- Denim #3B638C ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.041
- Dull Blue #49759C ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.045
- Metallic Blue #4F738E ΔE 0.047
Use #51669A 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.