#003F7D
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.12 254.3), rgb(0, 63, 125).
Aa
White text reads best on this color (10.46:1).
About this color
#003F7D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.120 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.015 away. White text reads best on it, at 10.46:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.46:1 |
Values
| HEX | #003F7D |
| RGB | rgb(0, 63, 125) |
| HSL | hsl(210, 100%, 25%) |
| OKLCH | oklch(37.2% 0.12 254.3) |
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 #003F7D | 10.46:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #003F7D | 2.00:1 | Fails | Lc 10.3 | Not readable |
| #003F7D text on white | 10.46:1 | AAA | Lc 93.6 | Preferred for body text |
| #003F7D text on black | 2.00:1 | Fails | Lc -8.9 | 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
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C3DCFA
oklch(88.6% 0.049 253.1)
-
Step 300
300
#99C4FA
oklch(80.9% 0.09 254.4)
-
Step 400
400
#5DA3F8
oklch(70.7% 0.144 254.4)
-
Step 500
500
#2589F4
oklch(63.1% 0.183 254.2)
-
Step 600
600
#0071D8
oklch(55.5% 0.179 254.5)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800
#004E97
oklch(42.8% 0.136 254.1)
-
Step 900
900 (this color)
#003F7D
oklch(37.2% 0.12 254.3)
-
Step 950
950
#06264A
oklch(26.9% 0.076 254.4)
#003F7D 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) | #1A457F | 0.025 |
| Deuteranopia (no green cones) | #003B7C | 0.012 |
| Tritanopia (no blue cones) | #004E58 | 0.088 |
| Achromatopsia (no color) | #3F3F3F | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003F7D
#003F7D
oklch(37.2% 0.12 254.3)
- #583900
#583900
oklch(37.2% 0.078 75)
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 #003F7D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.015
- Marine Blue #01386A ΔE 0.037
- Cobalt #1E488F ΔE 0.045
- Light Navy #155084 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.063
- Marine #042E60 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.068
- Dusk Blue #26538D ΔE 0.071
Use #003F7D 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.