#003F59
Closest named color: Midnight Green (#073B4C). oklch(34.6% 0.072 233.7), rgb(0, 63, 89).
Aa
White text reads best on this color (11.31:1).
About this color
#003F59 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.072 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.024 away. White text reads best on it, at 11.31:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.85:1 |
| White text | 11.31:1 |
Values
| HEX | #003F59 |
| RGB | rgb(0, 63, 89) |
| HSL | hsl(198, 100%, 17%) |
| OKLCH | oklch(34.6% 0.072 233.7) |
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 #003F59 | 11.31:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #003F59 | 1.85:1 | Fails | Lc 8.3 | Not readable |
| #003F59 text on white | 11.31:1 | AAA | Lc 95.6 | Preferred for body text |
| #003F59 text on black | 1.85:1 | 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
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C7DDEA
oklch(88.5% 0.03 233.6)
-
Step 300
300
#9FC7DF
oklch(80.9% 0.054 234.7)
-
Step 400
400
#67AACE
oklch(70.7% 0.086 233.3)
-
Step 500
500
#3594C2
oklch(63.1% 0.111 233.7)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900 (this color)
#003F59
oklch(34.6% 0.072 233.7)
-
Step 950
950
#0B2A39
oklch(27% 0.045 233.1)
#003F59 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) | #323F5A | 0.045 |
| Deuteranopia (no green cones) | #273759 | 0.037 |
| Tritanopia (no blue cones) | #004648 | 0.044 |
| Achromatopsia (no color) | #3A3A3A | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003F59
#003F59
oklch(34.6% 0.072 233.7)
- #562E10
#562E10
oklch(34.7% 0.072 54.2)
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 #003F59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.024
- Dark Blue Grey #1F3B4D ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.034
- Marine Blue #01386A ΔE 0.041
- Charcoal #264653 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.042
- Dark Teal #014D4E ΔE 0.056
- Gunmetal #293241 ΔE 0.057
Use #003F59 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.