#51789D
Closest named color: Stormy Blue (#507B9C). oklch(55.9% 0.073 248), rgb(81, 120, 157).
Aa
White text reads best on this color (4.64:1).
About this color
#51789D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.073 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.009 away. White text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.52:1 |
| White text | 4.64:1 |
Values
| HEX | #51789D |
| RGB | rgb(81, 120, 157) |
| HSL | hsl(209, 32%, 47%) |
| OKLCH | oklch(55.9% 0.073 248) |
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 #51789D | 4.64:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #51789D | 4.52:1 | AA | Lc 31.9 | Non-text elements, placeholder text |
| #51789D text on white | 4.64:1 | AA | Lc 72.2 | Content text, not long reading |
| #51789D text on black | 4.52:1 | AA | Lc -29.5 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#D0DAE5
oklch(88.4% 0.019 250.6)
-
Step 300
300
#B1C3D5
oklch(80.9% 0.032 248.2)
-
Step 400
400
#87A4C0
oklch(70.7% 0.052 247.7)
-
Step 500
500
#698DB0
oklch(63% 0.067 248.2)
-
Step 600
600 (this color)
#51789D
oklch(55.9% 0.073 248)
-
Step 700
700
#416485
oklch(49.1% 0.067 247.9)
-
Step 800
800
#36526C
oklch(42.8% 0.055 247.4)
-
Step 900
900
#2F4458
oklch(37.8% 0.043 247.8)
-
Step 950
950
#1C2833
oklch(27.1% 0.026 246.6)
#51789D 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) | #69799F | 0.031 |
| Deuteranopia (no green cones) | #5F719C | 0.024 |
| Tritanopia (no blue cones) | #2F8185 | 0.062 |
| Achromatopsia (no color) | #747474 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51789D
#51789D
oklch(55.9% 0.073 248)
- #916C44
#916C44
oklch(55.9% 0.073 67.6)
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 #51789D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.009
- Dull Blue #49759C ΔE 0.013
- Cerulean #457B9D ΔE 0.014
- Metallic Blue #4F738E ΔE 0.025
- Muted Blue #3B719F ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.034
- Grey Blue #647D8E ΔE 0.039
- Steel Blue #4682B4 ΔE 0.040
Use #51789D 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.