#043138
Closest named color: Oxford Blue (#1B263B). oklch(28.8% 0.047 210.7), rgb(4, 49, 56).
Aa
White text reads best on this color (13.98:1).
About this color
#043138 is a dark, muted teal or cyan. In OKLCH its lightness is 29%, its chroma 0.047 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.044 away. White text reads best on it, at 13.98:1.
| Hue family | Teals and cyans |
| Lightness | dark (29%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.50:1 |
| White text | 13.98:1 |
Values
| HEX | #043138 |
| RGB | rgb(4, 49, 56) |
| HSL | hsl(188, 87%, 12%) |
| OKLCH | oklch(28.8% 0.047 210.7) |
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 #043138 | 13.98:1 | AAA | Lc -103.4 | Preferred for body text |
| Black text on #043138 | 1.50:1 | Fails | Lc 0.0 | Not readable |
| #043138 text on white | 13.98:1 | AAA | Lc 100.4 | Preferred for body text |
| #043138 text on black | 1.50:1 | 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
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DEEDF0
oklch(93.6% 0.016 211)
-
Step 200
200
#C3DFE5
oklch(88.5% 0.031 212.1)
-
Step 300
300
#97CBD5
oklch(80.9% 0.056 210.7)
-
Step 400
400
#55B0C0
oklch(70.8% 0.089 210.5)
-
Step 500
500
#009BAE
oklch(63.2% 0.109 210)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005966
oklch(42.6% 0.074 211.8)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950 (this color)
#043138
oklch(28.8% 0.047 210.7)
#043138 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) | #2B2F38 | 0.044 |
| Deuteranopia (no green cones) | #242A38 | 0.039 |
| Tritanopia (no blue cones) | #003433 | 0.017 |
| Achromatopsia (no color) | #2C2C2C | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043138
#043138
oklch(28.8% 0.047 210.7)
- #3F211C
#3F211C
oklch(28.7% 0.048 30.3)
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 #043138, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.044
- Midnight Green #073B4C ΔE 0.045
- Gunmetal #293241 ΔE 0.045
- Dark #1B2431 ΔE 0.046
- Jet #212529 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.052
- Dark Blue Grey #1F3B4D ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.063
Use #043138 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.