#003F5C
Closest named color: Midnight Green (#073B4C). oklch(34.8% 0.076 236.7), rgb(0, 63, 92).
Aa
White text reads best on this color (11.25:1).
About this color
#003F5C is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.076 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.028 away. White text reads best on it, at 11.25:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.86:1 |
| White text | 11.25:1 |
Values
| HEX | #003F5C |
| RGB | rgb(0, 63, 92) |
| HSL | hsl(199, 100%, 18%) |
| OKLCH | oklch(34.8% 0.076 236.7) |
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 #003F5C | 11.25:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #003F5C | 1.86:1 | Fails | Lc 8.4 | Not readable |
| #003F5C text on white | 11.25:1 | AAA | Lc 95.5 | Preferred for body text |
| #003F5C text on black | 1.86:1 | Fails | Lc 0.0 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C6DDEC
oklch(88.5% 0.032 236.4)
-
Step 300
300
#9EC7E1
oklch(80.9% 0.057 236.2)
-
Step 400
400
#66A9D2
oklch(70.6% 0.091 236.9)
-
Step 500
500
#3493C6
oklch(63.1% 0.116 236.6)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900 (this color)
#003F5C
oklch(34.8% 0.076 236.7)
-
Step 950
950
#0B2A3B
oklch(27.1% 0.048 236.5)
#003F5C 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) | #313F5D | 0.043 |
| Deuteranopia (no green cones) | #25375C | 0.035 |
| Tritanopia (no blue cones) | #004649 | 0.047 |
| Achromatopsia (no color) | #3B3B3B | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003F5C
#003F5C
oklch(34.8% 0.076 236.7)
- #572E0B
#572E0B
oklch(34.8% 0.076 56.2)
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 #003F5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.034
- Marine Blue #01386A ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.042
- Charcoal #264653 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.053
- Marine #042E60 ΔE 0.056
Use #003F5C 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.