#003D80
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.126 256.1), rgb(0, 61, 128).
Aa
White text reads best on this color (10.61:1).
About this color
#003D80 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.126 and its hue 256°. 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 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #003D80 |
| RGB | rgb(0, 61, 128) |
| HSL | hsl(211, 100%, 25%) |
| OKLCH | oklch(36.9% 0.126 256.1) |
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 #003D80 | 10.61:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #003D80 | 1.97:1 | Fails | Lc 10.0 | Not readable |
| #003D80 text on white | 10.61:1 | AAA | Lc 93.9 | Preferred for body text |
| #003D80 text on black | 1.97:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFD
oklch(93.6% 0.028 256.5)
-
Step 200
200
#C3DBFC
oklch(88.4% 0.052 256.4)
-
Step 300
300
#98C3FE
oklch(80.8% 0.096 256.4)
-
Step 400
400
#5DA2FD
oklch(70.8% 0.151 256)
-
Step 500
500
#2687FB
oklch(63.1% 0.194 256)
-
Step 600
600
#006FDF
oklch(55.6% 0.191 256.1)
-
Step 700
700
#005DBD
oklch(49.1% 0.169 256.1)
-
Step 800
800
#004C9C
oklch(42.7% 0.146 256)
-
Step 900
900 (this color)
#003D80
oklch(36.9% 0.126 256.1)
-
Step 950
950
#07264C
oklch(27.1% 0.079 255.8)
#003D80 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) | #0F4482 | 0.023 |
| Deuteranopia (no green cones) | #003A7F | 0.009 |
| Tritanopia (no blue cones) | #004E58 | 0.096 |
| Achromatopsia (no color) | #3F3F3F | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003D80
#003D80
oklch(36.9% 0.126 256.1)
- #573900
#573900
oklch(37% 0.078 75.9)
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 #003D80, 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 0.039
- Cobalt #1E488F ΔE 0.046
- Light Navy #155084 ΔE 0.059
- Marine #042E60 ΔE 0.068
- Deep Sea Blue #015482 ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.072
- Dusk Blue #26538D ΔE 0.075
Use #003D80 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.