#51659F
Closest named color: Dusky Blue (#475F94). oklch(51.7% 0.095 268.5), rgb(81, 101, 159).
Aa
White text reads best on this color (5.65:1).
About this color
#51659F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.095 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.027 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #51659F |
| RGB | rgb(81, 101, 159) |
| HSL | hsl(225, 33%, 47%) |
| OKLCH | oklch(51.7% 0.095 268.5) |
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 #51659F | 5.65:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #51659F | 3.71:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #51659F text on white | 5.65:1 | AA | Lc 78.2 | Fine for body text |
| #51659F 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EB
oklch(88.5% 0.026 268.8)
-
Step 300
300
#B4C0DF
oklch(80.9% 0.046 268.6)
-
Step 400
400
#8D9FCF
oklch(70.6% 0.073 268.5)
-
Step 500
500
#7187C3
oklch(63.1% 0.094 268.2)
-
Step 600
600
#5A70AF
oklch(55.6% 0.102 268.4)
-
Step 700
700 (this color)
#51659F
oklch(51.7% 0.095 268.5)
-
Step 800
800
#3D4D7A
oklch(42.8% 0.078 268.2)
-
Step 900
900
#344062
oklch(37.7% 0.061 268.6)
-
Step 950
950
#1E263A
oklch(27.1% 0.039 267.1)
#51659F 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) | #4F6BA1 | 0.017 |
| Deuteranopia (no green cones) | #47649E | 0.013 |
| Tritanopia (no blue cones) | #32717A | 0.085 |
| Achromatopsia (no color) | #676767 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51659F
#51659F
oklch(51.7% 0.095 268.5)
- #7E6419
#7E6419
oklch(51.5% 0.095 88.5)
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 #51659F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.027
- French Blue #436BAD ΔE 0.028
- Muted Blue #3B719F ΔE 0.039
- Flat Blue #3C73A8 ΔE 0.042
- Denim #3B638C ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.046
- Dull Blue #49759C ΔE 0.048
- Mid Blue #276AB3 ΔE 0.048
Use #51659F 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.