#003E73
Closest named color: Twilight Blue (#0A437A). oklch(36.1% 0.107 251.6), rgb(0, 62, 115).
Aa
White text reads best on this color (10.84:1).
About this color
#003E73 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.107 and its hue 252°. 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 10.84:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.93:1 |
| White text | 10.84:1 |
Values
| HEX | #003E73 |
| RGB | rgb(0, 62, 115) |
| HSL | hsl(208, 100%, 23%) |
| OKLCH | oklch(36.1% 0.107 251.6) |
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 #003E73 | 10.84:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #003E73 | 1.93:1 | Fails | Lc 9.4 | Not readable |
| #003E73 text on white | 10.84:1 | AAA | Lc 94.5 | Preferred for body text |
| #003E73 text on black | 1.93:1 | Fails | Lc -8.1 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF6
oklch(88.5% 0.044 250.4)
-
Step 300
300
#9BC5F3
oklch(81% 0.079 251.1)
-
Step 400
400
#61A5EE
oklch(70.8% 0.128 251.6)
-
Step 500
500
#2C8CE8
oklch(63.1% 0.163 251.5)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900 (this color)
#003E73
oklch(36.1% 0.107 251.6)
-
Step 950
950
#082746
oklch(26.9% 0.068 251.9)
#003E73 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) | #214275 | 0.027 |
| Deuteranopia (no green cones) | #083972 | 0.014 |
| Tritanopia (no blue cones) | #004B52 | 0.079 |
| Achromatopsia (no color) | #3D3D3D | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003E73
#003E73
oklch(36.1% 0.107 251.6)
- #563500
#563500
oklch(36% 0.077 71.3)
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 #003E73, 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 0.023
- Prussian Blue #1D3557 ΔE 0.052
- Marine #042E60 ΔE 0.056
- Cobalt #1E488F ΔE 0.059
- Light Navy #155084 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.066
Use #003E73 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.