#133B6F
Closest named color: Marine Blue (#01386A). oklch(35.5% 0.1 256.6), rgb(19, 59, 111).
Aa
White text reads best on this color (11.15:1).
About this color
#133B6F is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.100 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.018 away. White text reads best on it, at 11.15:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.88:1 |
| White text | 11.15:1 |
Values
| HEX | #133B6F |
| RGB | rgb(19, 59, 111) |
| HSL | hsl(214, 71%, 25%) |
| OKLCH | oklch(35.5% 0.1 256.6) |
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 #133B6F | 11.15:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #133B6F | 1.88:1 | Fails | Lc 8.5 | Not readable |
| #133B6F text on white | 11.15:1 | AAA | Lc 95.4 | Preferred for body text |
| #133B6F text on black | 1.88:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A1C3F1
oklch(80.8% 0.075 256.1)
-
Step 400
400
#6EA2EB
oklch(70.6% 0.121 257)
-
Step 500
500
#4589E4
oklch(63% 0.154 256.5)
-
Step 600
600
#2471D2
oklch(55.6% 0.167 256.5)
-
Step 700
700
#165EB6
oklch(49.1% 0.155 256.5)
-
Step 800
800
#164D94
oklch(42.7% 0.13 256.9)
-
Step 900
900 (this color)
#133B6F
oklch(35.5% 0.1 256.6)
-
Step 950
950
#102645
oklch(26.9% 0.064 257.3)
#133B6F 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) | #204071 | 0.021 |
| Deuteranopia (no green cones) | #0C376E | 0.014 |
| Tritanopia (no blue cones) | #00474F | 0.076 |
| Achromatopsia (no color) | #3B3B3B | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133B6F
#133B6F
oklch(35.5% 0.1 256.6)
- #523600
#523600
oklch(35.7% 0.075 76.7)
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 #133B6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.018
- Twilight Blue #0A437A ΔE 0.028
- Prussian Blue #1D3557 ΔE 0.043
- Marine #042E60 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.060
- Midnight Green #073B4C ΔE 0.064
- Cobalt #1E488F ΔE 0.065
Use #133B6F 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.