#133666
Closest named color: Marine Blue (#01386A). oklch(33.6% 0.093 257.3), rgb(19, 54, 102).
Aa
White text reads best on this color (12.01:1).
About this color
#133666 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.093 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.012 away. White text reads best on it, at 12.01:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.74:1 |
| White text | 12.01:1 |
Values
| HEX | #133666 |
| RGB | rgb(19, 54, 102) |
| HSL | hsl(215, 69%, 24%) |
| OKLCH | oklch(33.6% 0.093 257.3) |
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 #133666 | 12.01:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #133666 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #133666 text on white | 12.01:1 | AAA | Lc 97.2 | Preferred for body text |
| #133666 text on black | 1.74:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#C9DBF3
oklch(88.5% 0.038 255.6)
-
Step 300
300
#A4C3EE
oklch(80.9% 0.07 256.6)
-
Step 400
400
#73A2E6
oklch(70.7% 0.112 257.6)
-
Step 500
500
#4D89DF
oklch(63% 0.145 257.6)
-
Step 600
600
#2F71CC
oklch(55.5% 0.156 257.4)
-
Step 700
700
#225FB1
oklch(49.2% 0.145 257.2)
-
Step 800
800
#1E4E8F
oklch(42.8% 0.119 257.1)
-
Step 900
900 (this color)
#133666
oklch(33.6% 0.093 257.3)
-
Step 950
950
#122643
oklch(26.9% 0.06 257.7)
#133666 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) | #1D3A68 | 0.017 |
| Deuteranopia (no green cones) | #0D3365 | 0.011 |
| Tritanopia (no blue cones) | #004149 | 0.071 |
| Achromatopsia (no color) | #363636 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133666
#133666
oklch(33.6% 0.093 257.3)
- #4B3100
#4B3100
oklch(33.6% 0.07 76.6)
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 #133666, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.012
- Prussian Blue #1D3557 ΔE 0.027
- Marine #042E60 ΔE 0.030
- Twilight Blue #0A437A ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.052
- Midnight Green #073B4C ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.065
- Gunmetal #293241 ΔE 0.067
Use #133666 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.