#133C7F
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.122 260), rgb(19, 60, 127).
Aa
White text reads best on this color (10.60:1).
About this color
#133C7F is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.122 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.60:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.60:1 |
Values
| HEX | #133C7F |
| RGB | rgb(19, 60, 127) |
| HSL | hsl(217, 74%, 29%) |
| OKLCH | oklch(37% 0.122 260) |
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 #133C7F | 10.60:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #133C7F | 1.98:1 | Fails | Lc 9.8 | Not readable |
| #133C7F text on white | 10.60:1 | AAA | Lc 94.1 | Preferred for body text |
| #133C7F text on black | 1.98:1 | Fails | Lc -8.4 | 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
#C6DAFC
oklch(88.4% 0.052 261.1)
-
Step 300
300
#9EC2FC
oklch(80.9% 0.091 259.8)
-
Step 400
400
#68A0FB
oklch(70.7% 0.146 259.7)
-
Step 500
500
#3E84F9
oklch(63% 0.189 260.1)
-
Step 600
600
#1B6AE8
oklch(55.5% 0.205 260.1)
-
Step 700
700
#0C58C9
oklch(49.1% 0.189 259.8)
-
Step 800
800
#0F49A3
oklch(42.8% 0.157 259.8)
-
Step 900
900 (this color)
#133C7F
oklch(37% 0.122 260)
-
Step 950
950
#0E254C
oklch(27.1% 0.078 260.3)
#133C7F 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) | #104481 | 0.023 |
| Deuteranopia (no green cones) | #003A7E | 0.013 |
| Tritanopia (no blue cones) | #004C57 | 0.094 |
| Achromatopsia (no color) | #3F3F3F | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #133C7F
#133C7F
oklch(37% 0.122 260)
- #553A00
#553A00
oklch(37% 0.077 79.3)
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 #133C7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.040
- Cobalt #1E488F ΔE 0.044
- Light Navy #155084 ΔE 0.059
- Marine #042E60 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.069
- Deep Sea Blue #015482 ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.071
Use #133C7F 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.