#042F3E
Closest named color: Oxford Blue (#1B263B). oklch(28.5% 0.052 227), rgb(4, 47, 62).
Aa
White text reads best on this color (14.17:1).
About this color
#042F3E is a dark, muted teal or cyan. In OKLCH its lightness is 29%, its chroma 0.052 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.034 away. White text reads best on it, at 14.17:1.
| Hue family | Teals and cyans |
| Lightness | dark (29%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.48:1 |
| White text | 14.17:1 |
Values
| HEX | #042F3E |
| RGB | rgb(4, 47, 62) |
| HSL | hsl(196, 88%, 13%) |
| OKLCH | oklch(28.5% 0.052 227) |
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 #042F3E | 14.17:1 | AAA | Lc -103.6 | Preferred for body text |
| Black text on #042F3E | 1.48:1 | Fails | Lc 0.0 | Not readable |
| #042F3E text on white | 14.17:1 | AAA | Lc 100.6 | Preferred for body text |
| #042F3E text on black | 1.48:1 | 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 950.
-
Step 50
50
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DEEDF3
oklch(93.7% 0.018 223.6)
-
Step 200
200
#C3DEEB
oklch(88.5% 0.034 228.4)
-
Step 300
300
#97C9E0
oklch(80.9% 0.061 228)
-
Step 400
400
#55ADD0
oklch(70.7% 0.098 226.8)
-
Step 500
500
#0097C2
oklch(63.1% 0.122 226.9)
-
Step 600
600
#007FA4
oklch(55.6% 0.108 227.1)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
Step 800
800
#005772
oklch(42.6% 0.083 227.6)
-
Step 900
900
#00495F
oklch(37.8% 0.072 226.2)
-
Step 950
950 (this color)
#042F3E
oklch(28.5% 0.052 227)
#042F3E 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) | #272E3F | 0.038 |
| Deuteranopia (no green cones) | #1F293E | 0.032 |
| Tritanopia (no blue cones) | #003334 | 0.027 |
| Achromatopsia (no color) | #2B2B2B | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042F3E
#042F3E
oklch(28.5% 0.052 227)
- #3F2112
#3F2112
oklch(28.4% 0.053 46.4)
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 #042F3E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.034
- Dark #1B2431 ΔE 0.042
- Gunmetal #293241 ΔE 0.044
- Midnight Green #073B4C ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.046
- Jet #212529 ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.055
Use #042F3E 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.