#51689B
Closest named color: French Blue (#436BAD). oklch(52.1% 0.086 265.1), rgb(81, 104, 155).
Aa
White text reads best on this color (5.52:1).
About this color
#51689B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.086 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.031 away. White text reads best on it, at 5.52:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.80:1 |
| White text | 5.52:1 |
Values
| HEX | #51689B |
| RGB | rgb(81, 104, 155) |
| HSL | hsl(221, 31%, 46%) |
| OKLCH | oklch(52.1% 0.086 265.1) |
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 #51689B | 5.52:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #51689B | 3.80:1 | AA large text | Lc 26.6 | Dividers and decoration only |
| #51689B text on white | 5.52:1 | AA | Lc 77.5 | Fine for body text |
| #51689B text on black | 3.80:1 | AA large text | Lc -24.3 | 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
#B4C1DC
oklch(81% 0.041 265)
-
Step 400
400
#8CA0CB
oklch(70.6% 0.067 265.3)
-
Step 500
500
#7089BD
oklch(63.1% 0.084 264.4)
-
Step 600
600
#5972AA
oklch(55.7% 0.092 265.2)
-
Step 700
700 (this color)
#51689B
oklch(52.1% 0.086 265.1)
-
Step 800
800
#3C4E76
oklch(42.7% 0.071 265.1)
-
Step 900
900
#33415F
oklch(37.7% 0.055 264.7)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#51689B 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) | #556C9D | 0.013 |
| Deuteranopia (no green cones) | #4D669A | 0.008 |
| Tritanopia (no blue cones) | #34737A | 0.078 |
| Achromatopsia (no color) | #696969 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51689B
#51689B
oklch(52.1% 0.086 265.1)
- #806528
#806528
oklch(52.1% 0.086 84.9)
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 #51689B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.031
- Dusky Blue #475F94 ΔE 0.031
- Muted Blue #3B719F ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.037
- Dull Blue #49759C ΔE 0.038
- Denim #3B638C ΔE 0.039
- Metallic Blue #4F738E ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.050
Use #51689B 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.