#133A81
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.128 261.2), rgb(19, 58, 129).
Aa
White text reads best on this color (10.76:1).
About this color
#133A81 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.128 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 10.76:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.76:1 |
Values
| HEX | #133A81 |
| RGB | rgb(19, 58, 129) |
| HSL | hsl(219, 74%, 29%) |
| OKLCH | oklch(36.7% 0.128 261.2) |
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 #133A81 | 10.76:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #133A81 | 1.94:1 | Fails | Lc 9.5 | Not readable |
| #133A81 text on white | 10.76:1 | AAA | Lc 94.4 | Preferred for body text |
| #133A81 text on black | 1.94:1 | Fails | Lc -8.1 | 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
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C6DAFD
oklch(88.5% 0.053 261.7)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699FFF
oklch(70.8% 0.152 261.1)
-
Step 500
500
#3F83FE
oklch(63.2% 0.196 261.1)
-
Step 600
600
#1E68ED
oklch(55.6% 0.213 261.2)
-
Step 700
700
#1055CE
oklch(49% 0.198 261.2)
-
Step 800
800
#1147A7
oklch(42.8% 0.164 261.1)
-
Step 900
900 (this color)
#133A81
oklch(36.7% 0.128 261.2)
-
Step 950
950
#0E244D
oklch(26.9% 0.081 261.5)
#133A81 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) | #024384 | 0.025 |
| Deuteranopia (no green cones) | #003980 | 0.011 |
| Tritanopia (no blue cones) | #004B57 | 0.098 |
| Achromatopsia (no color) | #3E3E3E | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133A81
#133A81
oklch(36.7% 0.128 261.2)
- #533A00
#533A00
oklch(36.7% 0.076 81.4)
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 #133A81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Marine Blue #01386A ΔE 0.042
- Cobalt #1E488F ΔE 0.047
- Light Navy #155084 ΔE 0.064
- Marine #042E60 ΔE 0.068
- Sapphire #2138AB ΔE 0.071
- Dark Slate Blue #483D8B ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.072
Use #133A81 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.