#123D43
Closest named color: Midnight Green (#073B4C). oklch(33.4% 0.047 208.1), rgb(18, 61, 67).
Aa
White text reads best on this color (11.83:1).
About this color
#123D43 is a dark, muted teal or cyan. In OKLCH its lightness is 33%, its chroma 0.047 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.020 away. White text reads best on it, at 11.83:1.
| Hue family | Teals and cyans |
| Lightness | dark (33%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.77:1 |
| White text | 11.83:1 |
Values
| HEX | #123D43 |
| RGB | rgb(18, 61, 67) |
| HSL | hsl(187, 58%, 17%) |
| OKLCH | oklch(33.4% 0.047 208.1) |
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 #123D43 | 11.83:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #123D43 | 1.77:1 | Fails | Lc 0.0 | Not readable |
| #123D43 text on white | 11.83:1 | AAA | Lc 96.9 | Preferred for body text |
| #123D43 text on black | 1.77:1 | 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
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CBDDE0
oklch(88.5% 0.02 208.8)
-
Step 300
300
#A7C7CD
oklch(80.8% 0.035 210.2)
-
Step 400
400
#76ABB3
oklch(70.7% 0.057 207.8)
-
Step 500
500
#4F96A0
oklch(63.1% 0.073 207.4)
-
Step 600
600
#2F808B
oklch(55.6% 0.079 207.7)
-
Step 700
700
#206C76
oklch(49% 0.073 207.7)
-
Step 800
800
#1D5860
oklch(42.6% 0.061 207.8)
-
Step 900
900 (this color)
#123D43
oklch(33.4% 0.047 208.1)
-
Step 950
950
#132B2E
oklch(27.1% 0.03 206.1)
#123D43 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) | #373A43 | 0.045 |
| Deuteranopia (no green cones) | #303543 | 0.042 |
| Tritanopia (no blue cones) | #00403F | 0.017 |
| Achromatopsia (no color) | #373737 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123D43
#123D43
oklch(33.4% 0.047 208.1)
- #4C2D28
#4C2D28
oklch(33.4% 0.047 29.7)
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 #123D43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.020
- Dark Blue Grey #1F3B4D ΔE 0.025
- Onyx #343A40 ΔE 0.040
- Gunmetal #293241 ΔE 0.042
- Charcoal #264653 ΔE 0.044
- Prussian Blue #1D3557 ΔE 0.052
- Dark Teal #014D4E ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.055
Use #123D43 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.