#133E7C
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.115 258.3), rgb(19, 62, 124).
Aa
White text reads best on this color (10.45:1).
About this color
#133E7C is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.115 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.015 away. White text reads best on it, at 10.45:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #133E7C |
| RGB | rgb(19, 62, 124) |
| HSL | hsl(215, 73%, 28%) |
| OKLCH | oklch(37.2% 0.115 258.3) |
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 #133E7C | 10.45:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #133E7C | 2.00:1 | Fails | Lc 10.1 | Not readable |
| #133E7C text on white | 10.45:1 | AAA | Lc 93.8 | Preferred for body text |
| #133E7C text on black | 2.00:1 | Fails | Lc -8.7 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9EC3F9
oklch(81% 0.087 257.7)
-
Step 400
400
#69A1F6
oklch(70.7% 0.139 258.5)
-
Step 500
500
#3E87F2
oklch(63.2% 0.176 258.2)
-
Step 600
600
#186DE1
oklch(55.6% 0.193 258.4)
-
Step 700
700
#085AC3
oklch(49% 0.179 258.4)
-
Step 800
800
#0D4B9E
oklch(42.8% 0.148 258.2)
-
Step 900
900 (this color)
#133E7C
oklch(37.2% 0.115 258.3)
-
Step 950
950
#0D2649
oklch(27.1% 0.072 257.4)
#133E7C 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) | #1A447E | 0.019 |
| Deuteranopia (no green cones) | #003B7B | 0.015 |
| Tritanopia (no blue cones) | #004D57 | 0.088 |
| Achromatopsia (no color) | #3F3F3F | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133E7C
#133E7C
oklch(37.2% 0.115 258.3)
- #563A00
#563A00
oklch(37.1% 0.077 78.3)
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 #133E7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.015
- Marine Blue #01386A ΔE 0.038
- Cobalt #1E488F ΔE 0.043
- Light Navy #155084 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.064
- Prussian Blue #1D3557 ΔE 0.065
- Marine #042E60 ΔE 0.068
- Dusk Blue #26538D ΔE 0.069
Use #133E7C 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.