#133C7C
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.118 259.4), rgb(19, 60, 124).
Aa
White text reads best on this color (10.68:1).
About this color
#133C7C is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.118 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.021 away. White text reads best on it, at 10.68:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.68:1 |
Values
| HEX | #133C7C |
| RGB | rgb(19, 60, 124) |
| HSL | hsl(217, 73%, 28%) |
| OKLCH | oklch(36.8% 0.118 259.4) |
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 #133C7C | 10.68:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #133C7C | 1.96:1 | Fails | Lc 9.6 | Not readable |
| #133C7C text on white | 10.68:1 | AAA | Lc 94.3 | Preferred for body text |
| #133C7C text on black | 1.96:1 | Fails | Lc -8.3 | 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
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9FC2FA
oklch(80.9% 0.088 259.7)
-
Step 400
400
#69A0F8
oklch(70.6% 0.142 259.4)
-
Step 500
500
#3F86F5
oklch(63.2% 0.181 259.2)
-
Step 600
600
#1C6CE4
oklch(55.6% 0.197 259.4)
-
Step 700
700
#0E59C6
oklch(49.1% 0.184 259.5)
-
Step 800
800
#104AA0
oklch(42.8% 0.151 259.2)
-
Step 900
900 (this color)
#133C7C
oklch(36.8% 0.118 259.4)
-
Step 950
950
#0E254A
oklch(26.9% 0.075 259.5)
#133C7C 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) | #15437E | 0.021 |
| Deuteranopia (no green cones) | #003A7B | 0.013 |
| Tritanopia (no blue cones) | #004B56 | 0.089 |
| Achromatopsia (no color) | #3E3E3E | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133C7C
#133C7C
oklch(36.8% 0.118 259.4)
- #543A00
#543A00
oklch(36.9% 0.076 80.3)
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 #133C7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.021
- Marine Blue #01386A ΔE 0.035
- Cobalt #1E488F ΔE 0.047
- Light Navy #155084 ΔE 0.059
- Marine #042E60 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.073
Use #133C7C 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.