#133578
Closest named color: Marine Blue (#01386A). oklch(34.8% 0.121 262), rgb(19, 53, 120).
Aa
White text reads best on this color (11.61:1).
About this color
#133578 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.121 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.029 away. White text reads best on it, at 11.61:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.80:1 |
| White text | 11.61:1 |
Values
| HEX | #133578 |
| RGB | rgb(19, 53, 120) |
| HSL | hsl(220, 73%, 27%) |
| OKLCH | oklch(34.8% 0.121 262) |
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 #133578 | 11.61:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #133578 | 1.80:1 | Fails | Lc 7.7 | Not readable |
| #133578 text on white | 11.61:1 | AAA | Lc 96.2 | Preferred for body text |
| #133578 text on black | 1.80:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A1C1FC
oklch(80.9% 0.091 262.4)
-
Step 400
400
#6D9FFB
oklch(70.8% 0.146 261.8)
-
Step 500
500
#4783F8
oklch(63.1% 0.186 262.1)
-
Step 600
600
#2969E7
oklch(55.6% 0.202 262)
-
Step 700
700
#1C56C9
oklch(49% 0.189 262)
-
Step 800
800
#1948A3
oklch(42.8% 0.156 261.8)
-
Step 900
900 (this color)
#133578
oklch(34.8% 0.121 262)
-
Step 950
950
#10244B
oklch(26.8% 0.077 262.1)
#133578 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) | #003D7A | 0.023 |
| Deuteranopia (no green cones) | #003477 | 0.013 |
| Tritanopia (no blue cones) | #004551 | 0.093 |
| Achromatopsia (no color) | #393939 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133578
#133578
oklch(34.8% 0.121 262)
- #4C3600
#4C3600
oklch(34.9% 0.072 83.2)
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 #133578, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.029
- Twilight Blue #0A437A ΔE 0.040
- Marine #042E60 ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.058
- Cobalt #1E488F ΔE 0.066
- Midnight Blue #191970 ΔE 0.069
- Royal #0C1793 ΔE 0.076
- Light Navy #155084 ΔE 0.080
Use #133578 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.