#003D7C
Closest named color: Twilight Blue (#0A437A). oklch(36.6% 0.121 255.1), rgb(0, 61, 124).
Aa
White text reads best on this color (10.72:1).
About this color
#003D7C is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.121 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.020 away. White text reads best on it, at 10.72:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #003D7C |
| RGB | rgb(0, 61, 124) |
| HSL | hsl(210, 100%, 24%) |
| OKLCH | oklch(36.6% 0.121 255.1) |
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 #003D7C | 10.72:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #003D7C | 1.95:1 | Fails | Lc 9.7 | Not readable |
| #003D7C text on white | 10.72:1 | AAA | Lc 94.2 | Preferred for body text |
| #003D7C text on black | 1.95:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C3DBFB
oklch(88.4% 0.051 255.7)
-
Step 300
300
#99C4FB
oklch(81% 0.091 254.9)
-
Step 400
400
#5EA3F9
oklch(70.8% 0.145 254.9)
-
Step 500
500
#2888F6
oklch(63.1% 0.186 255.2)
-
Step 600
600
#0071DB
oklch(55.7% 0.183 255)
-
Step 700
700
#005EB9
oklch(49% 0.162 255.1)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900 (this color)
#003D7C
oklch(36.6% 0.121 255.1)
-
Step 950
950
#07264B
oklch(27% 0.077 255.4)
#003D7C 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) | #16437E | 0.023 |
| Deuteranopia (no green cones) | #00397B | 0.012 |
| Tritanopia (no blue cones) | #004C56 | 0.089 |
| Achromatopsia (no color) | #3E3E3E | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003D7C
#003D7C
oklch(36.6% 0.121 255.1)
- #563800
#563800
oklch(36.7% 0.077 75.5)
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 #003D7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.020
- Marine Blue #01386A ΔE 0.033
- Cobalt #1E488F ΔE 0.050
- Light Navy #155084 ΔE 0.060
- Marine #042E60 ΔE 0.063
- Prussian Blue #1D3557 ΔE 0.065
- Deep Sea Blue #015482 ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.075
Use #003D7C 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.