#133D7E
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.12 259.3), rgb(19, 61, 126).
Aa
White text reads best on this color (10.51:1).
About this color
#133D7E is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.120 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.019 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #133D7E |
| RGB | rgb(19, 61, 126) |
| HSL | hsl(216, 74%, 28%) |
| OKLCH | oklch(37.2% 0.12 259.3) |
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 #133D7E | 10.51:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #133D7E | 1.99:1 | Fails | Lc 10.0 | Not readable |
| #133D7E text on white | 10.51:1 | AAA | Lc 93.9 | Preferred for body text |
| #133D7E text on black | 1.99:1 | Fails | Lc -8.6 | 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
#C6DBFB
oklch(88.6% 0.05 258.7)
-
Step 300
300
#9EC2FB
oklch(80.9% 0.09 259.4)
-
Step 400
400
#68A0F9
oklch(70.6% 0.144 259.3)
-
Step 500
500
#3E85F6
oklch(63% 0.184 259.4)
-
Step 600
600
#196CE5
oklch(55.7% 0.199 259.2)
-
Step 700
700
#0A59C7
oklch(49.1% 0.185 259.3)
-
Step 800
800
#0E49A1
oklch(42.6% 0.154 259.4)
-
Step 900
900 (this color)
#133D7E
oklch(37.2% 0.12 259.3)
-
Step 950
950
#0D254B
oklch(27% 0.077 259.3)
#133D7E 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) | #154480 | 0.021 |
| Deuteranopia (no green cones) | #003B7D | 0.013 |
| Tritanopia (no blue cones) | #004D57 | 0.093 |
| Achromatopsia (no color) | #3F3F3F | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133D7E
#133D7E
oklch(37.2% 0.12 259.3)
- #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 #133D7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.019
- Marine Blue #01386A ΔE 0.039
- Cobalt #1E488F ΔE 0.043
- Light Navy #155084 ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.067
- Prussian Blue #1D3557 ΔE 0.068
- Marine #042E60 ΔE 0.068
- Dusk Blue #26538D ΔE 0.071
Use #133D7E 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.