#51709D
Closest named color: Dull Blue (#49759C). oklch(54.1% 0.08 257.6), rgb(81, 112, 157).
Aa
White text reads best on this color (5.05:1).
About this color
#51709D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.080 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.017 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #51709D |
| RGB | rgb(81, 112, 157) |
| HSL | hsl(216, 32%, 47%) |
| OKLCH | oklch(54.1% 0.08 257.6) |
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 #51709D | 5.05:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #51709D | 4.15:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #51709D text on white | 5.05:1 | AA | Lc 74.8 | Content text, not long reading |
| #51709D text on black | 4.15:1 | AA large text | Lc -26.9 | 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 600.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D1DAE7
oklch(88.5% 0.02 257.5)
-
Step 300
300
#B2C2D8
oklch(80.9% 0.036 256.4)
-
Step 400
400
#8AA2C5
oklch(70.6% 0.058 257.7)
-
Step 500
500
#6D8BB6
oklch(63.1% 0.074 257.4)
-
Step 600
600 (this color)
#51709D
oklch(54.1% 0.08 257.6)
-
Step 700
700
#46628B
oklch(49.2% 0.074 257.8)
-
Step 800
800
#395071
oklch(42.7% 0.062 257.4)
-
Step 900
900
#31425B
oklch(37.6% 0.048 257.9)
-
Step 950
950
#1D2735
oklch(27% 0.03 256.9)
#51709D 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) | #5F739F | 0.021 |
| Deuteranopia (no green cones) | #566B9C | 0.015 |
| Tritanopia (no blue cones) | #317A80 | 0.070 |
| Achromatopsia (no color) | #6F6F6F | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51709D
#51709D
oklch(54.1% 0.08 257.6)
- #896936
#896936
oklch(54.2% 0.08 77.4)
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 #51709D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.017
- Muted Blue #3B719F ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.026
- Metallic Blue #4F738E ΔE 0.028
- Stormy Blue #507B9C ΔE 0.033
- Cerulean #457B9D ΔE 0.033
- French Blue #436BAD ΔE 0.036
- Dusky Blue #475F94 ΔE 0.052
Use #51709D 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.