#51729D
Closest named color: Dull Blue (#49759C). oklch(54.5% 0.078 255.4), rgb(81, 114, 157).
Aa
White text reads best on this color (4.94:1).
About this color
#51729D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.078 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.012 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.24:1 |
| White text | 4.94:1 |
Values
| HEX | #51729D |
| RGB | rgb(81, 114, 157) |
| HSL | hsl(214, 32%, 47%) |
| OKLCH | oklch(54.5% 0.078 255.4) |
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 #51729D | 4.94:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #51729D | 4.24:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #51729D text on white | 4.94:1 | AA | Lc 74.2 | Content text, not long reading |
| #51729D text on black | 4.24:1 | AA large text | Lc -27.5 | 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
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D1DAE6
oklch(88.5% 0.019 255.5)
-
Step 300
300
#B2C2D7
oklch(80.9% 0.035 255.2)
-
Step 400
400
#8AA3C4
oklch(70.8% 0.056 255.5)
-
Step 500
500
#6C8CB5
oklch(63.2% 0.072 254.9)
-
Step 600
600 (this color)
#51729D
oklch(54.5% 0.078 255.4)
-
Step 700
700
#446289
oklch(49% 0.072 255.3)
-
Step 800
800
#38506F
oklch(42.6% 0.06 255.2)
-
Step 900
900
#31435A
oklch(37.8% 0.046 254.9)
-
Step 950
950
#1D2735
oklch(27% 0.03 256.9)
#51729D 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) | #61749F | 0.022 |
| Deuteranopia (no green cones) | #586D9C | 0.016 |
| Tritanopia (no blue cones) | #307C81 | 0.069 |
| Achromatopsia (no color) | #707070 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51729D
#51729D
oklch(54.5% 0.078 255.4)
- #8B6A39
#8B6A39
oklch(54.7% 0.078 75.7)
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 #51729D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.012
- Muted Blue #3B719F ΔE 0.024
- Metallic Blue #4F738E ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.026
- Stormy Blue #507B9C ΔE 0.027
- Cerulean #457B9D ΔE 0.028
- French Blue #436BAD ΔE 0.040
- Steel Blue #4682B4 ΔE 0.050
Use #51729D 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.