#123E40
Closest named color: Midnight Green (#073B4C). oklch(33.5% 0.047 199.4), rgb(18, 62, 64).
Aa
White text reads best on this color (11.73:1).
About this color
#123E40 is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.047 and its hue 199°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.027 away. White text reads best on it, at 11.73:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.78:1 |
| White text | 11.73:1 |
Values
| HEX | #123E40 |
| RGB | rgb(18, 62, 64) |
| HSL | hsl(183, 56%, 16%) |
| OKLCH | oklch(33.5% 0.047 199.4) |
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 #123E40 | 11.73:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #123E40 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #123E40 text on white | 11.73:1 | AAA | Lc 96.8 | Preferred for body text |
| #123E40 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#CBDDDE
oklch(88.4% 0.019 200.8)
-
Step 300
300
#A7C8C9
oklch(80.9% 0.035 198.7)
-
Step 400
400
#76ACAE
oklch(70.8% 0.057 198.9)
-
Step 500
500
#4F979A
oklch(63.1% 0.072 199)
-
Step 600
600
#2E8185
oklch(55.6% 0.078 199.7)
-
Step 700
700
#1F6D71
oklch(49.1% 0.073 200.1)
-
Step 800
800
#1D595C
oklch(42.7% 0.061 199.8)
-
Step 900
900 (this color)
#123E40
oklch(33.5% 0.047 199.4)
-
Step 950
950
#132B2C
oklch(27% 0.03 199.1)
#123E40 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) | #393B40 | 0.048 |
| Deuteranopia (no green cones) | #323640 | 0.044 |
| Tritanopia (no blue cones) | #00403E | 0.013 |
| Achromatopsia (no color) | #383838 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123E40
#123E40
oklch(33.5% 0.047 199.4)
- #4C2C2D
#4C2C2D
oklch(33.4% 0.048 17.9)
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 #123E40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.032
- Onyx #343A40 ΔE 0.041
- Charcoal #264653 ΔE 0.046
- Gunmetal #293241 ΔE 0.046
- Dark Teal #014D4E ΔE 0.049
- Charcoal Grey #3C4142 ΔE 0.054
- Evergreen #05472A ΔE 0.057
Use #123E40 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.