#003F4B
Closest named color: Midnight Green (#073B4C). oklch(33.9% 0.06 215.5), rgb(0, 63, 75).
Aa
White text reads best on this color (11.58:1).
About this color
#003F4B is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.060 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.014 away. White text reads best on it, at 11.58:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.81:1 |
| White text | 11.58:1 |
Values
| HEX | #003F4B |
| RGB | rgb(0, 63, 75) |
| HSL | hsl(190, 100%, 15%) |
| OKLCH | oklch(33.9% 0.06 215.5) |
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 #003F4B | 11.58:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #003F4B | 1.81:1 | Fails | Lc 7.7 | Not readable |
| #003F4B text on white | 11.58:1 | AAA | Lc 96.2 | Preferred for body text |
| #003F4B text on black | 1.81:1 | 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
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECEF
oklch(93.6% 0.012 215.8)
-
Step 200
200
#C8DEE4
oklch(88.6% 0.025 215.9)
-
Step 300
300
#A0C9D3
oklch(81% 0.046 214.2)
-
Step 400
400
#6AACBD
oklch(70.7% 0.072 216)
-
Step 500
500
#3997AC
oklch(63% 0.092 215.3)
-
Step 600
600
#008197
oklch(55.5% 0.098 215.2)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900 (this color)
#003F4B
oklch(33.9% 0.06 215.5)
-
Step 950
950
#0C2B32
oklch(27% 0.038 215.2)
#003F4B 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) | #373D4C | 0.053 |
| Deuteranopia (no green cones) | #2D364B | 0.047 |
| Tritanopia (no blue cones) | #004343 | 0.023 |
| Achromatopsia (no color) | #393939 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003F4B
#003F4B
oklch(33.9% 0.06 215.5)
- #522B21
#522B21
oklch(33.8% 0.061 35.3)
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 #003F4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.014
- Dark Blue Grey #1F3B4D ΔE 0.025
- Charcoal #264653 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.047
- Dark Teal #014D4E ΔE 0.048
- Onyx #343A40 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.050
- Gunmetal #293241 ΔE 0.050
Use #003F4B 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.