#003F42
Closest named color: Midnight Green (#073B4C). oklch(33.4% 0.057 200.1), rgb(0, 63, 66).
Aa
White text reads best on this color (11.73:1).
About this color
#003F42 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.057 and its hue 200°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.026 away. White text reads best on it, at 11.73:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.78:1 |
| White text | 11.73:1 |
Values
| HEX | #003F42 |
| RGB | rgb(0, 63, 66) |
| HSL | hsl(183, 100%, 13%) |
| OKLCH | oklch(33.4% 0.057 200.1) |
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 #003F42 | 11.73:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #003F42 | 1.78:1 | Fails | Lc 7.4 | Not readable |
| #003F42 text on white | 11.73:1 | AAA | Lc 96.5 | Preferred for body text |
| #003F42 text on black | 1.78:1 | 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
#F1F7F7
oklch(97.2% 0.006 197.1)
-
Step 100
100
#E1ECED
oklch(93.5% 0.012 203.5)
-
Step 200
200
#C8DEDF
oklch(88.5% 0.024 200.1)
-
Step 300
300
#A1C9CB
oklch(80.8% 0.042 200.1)
-
Step 400
400
#6BAEB1
oklch(70.7% 0.068 199.4)
-
Step 500
500
#3C999E
oklch(63% 0.087 200.2)
-
Step 600
600
#008389
oklch(55.5% 0.094 200.5)
-
Step 700
700
#006F73
oklch(49.2% 0.084 199.2)
-
Step 800
800
#005B5F
oklch(42.8% 0.073 200)
-
Step 900
900 (this color)
#003F42
oklch(33.4% 0.057 200.1)
-
Step 950
950
#0D2C2D
oklch(27.1% 0.036 198.2)
#003F42 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) | #393C42 | 0.057 |
| Deuteranopia (no green cones) | #313542 | 0.054 |
| Tritanopia (no blue cones) | #004240 | 0.012 |
| Achromatopsia (no color) | #383838 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003F42
#003F42
oklch(33.4% 0.057 200.1)
- #502A2A
#502A2A
oklch(33.5% 0.057 20.5)
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 #003F42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.036
- Dark Teal #014D4E ΔE 0.048
- Charcoal #264653 ΔE 0.049
- Onyx #343A40 ΔE 0.050
- Gunmetal #293241 ΔE 0.053
- Evergreen #05472A ΔE 0.057
- Dark Grey Blue #29465B ΔE 0.060
Use #003F42 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.