#51799F
Closest named color: Stormy Blue (#507B9C). oklch(56.2% 0.074 248), rgb(81, 121, 159).
Aa
Black text reads best on this color (4.58:1).
About this color
#51799F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.074 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. Black text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.58:1 |
| White text | 4.57:1 |
Values
| HEX | #51799F |
| RGB | rgb(81, 121, 159) |
| HSL | hsl(209, 33%, 47%) |
| OKLCH | oklch(56.2% 0.074 248) |
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 #51799F | 4.57:1 | AA | Lc -77.2 | Fine for body text |
| Black text on #51799F | 4.58:1 | AA | Lc 32.4 | Non-text elements, placeholder text |
| #51799F text on white | 4.57:1 | AA | Lc 71.7 | Content text, not long reading |
| #51799F text on black | 4.58:1 | AA | Lc -30.0 | 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
#D0DBE5
oklch(88.6% 0.018 245.4)
-
Step 300
300
#B0C3D6
oklch(80.9% 0.034 248.2)
-
Step 400
400
#87A4C1
oklch(70.7% 0.053 248.6)
-
Step 500
500
#688DB1
oklch(63% 0.068 248.3)
-
Step 600
600 (this color)
#51799F
oklch(56.2% 0.074 248)
-
Step 700
700
#406486
oklch(49.1% 0.069 248)
-
Step 800
800
#35526D
oklch(42.8% 0.057 247.6)
-
Step 900
900
#2E4458
oklch(37.7% 0.044 246.7)
-
Step 950
950
#1B2834
oklch(27.1% 0.029 246.9)
#51799F 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) | #6A7AA1 | 0.032 |
| Deuteranopia (no green cones) | #60729E | 0.025 |
| Tritanopia (no blue cones) | #2D8286 | 0.064 |
| Achromatopsia (no color) | #757575 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51799F
#51799F
oklch(56.2% 0.074 248)
- #926D44
#926D44
oklch(56.3% 0.074 68.2)
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 #51799F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.009
- Cerulean #457B9D ΔE 0.014
- Dull Blue #49759C ΔE 0.016
- Metallic Blue #4F738E ΔE 0.029
- Flat Blue #3C73A8 ΔE 0.034
- Muted Blue #3B719F ΔE 0.035
- Steel Blue #4682B4 ΔE 0.036
- Off Blue #5684AE ΔE 0.036
Use #51799F 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.