#123D4F
Closest named color: Midnight Green (#073B4C). oklch(34% 0.056 229.6), rgb(18, 61, 79).
Aa
White text reads best on this color (11.62:1).
About this color
#123D4F is a dark, muted teal or cyan. In OKLCH its lightness is 34%, its chroma 0.056 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.011 away. White text reads best on it, at 11.62:1.
| Hue family | Teals and cyans |
| Lightness | dark (34%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.80:1 |
| White text | 11.62:1 |
Values
| HEX | #123D4F |
| RGB | rgb(18, 61, 79) |
| HSL | hsl(198, 63%, 19%) |
| OKLCH | oklch(34% 0.056 229.6) |
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 #123D4F | 11.62:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #123D4F | 1.80:1 | Fails | Lc 7.4 | Not readable |
| #123D4F text on white | 11.62:1 | AAA | Lc 96.5 | Preferred for body text |
| #123D4F text on black | 1.80:1 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADCE6
oklch(88.4% 0.024 231.9)
-
Step 300
300
#A6C6D7
oklch(80.9% 0.042 231.1)
-
Step 400
400
#74A9C2
oklch(70.7% 0.067 229.1)
-
Step 500
500
#4D93B3
oklch(63.1% 0.085 229.9)
-
Step 600
600
#2B7D9F
oklch(55.6% 0.093 229.7)
-
Step 700
700
#1C6988
oklch(49% 0.087 229.9)
-
Step 800
800
#1B566E
oklch(42.7% 0.071 229.2)
-
Step 900
900 (this color)
#123D4F
oklch(34% 0.056 229.6)
-
Step 950
950
#122A34
oklch(27.1% 0.035 227.4)
#123D4F 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) | #343C50 | 0.040 |
| Deuteranopia (no green cones) | #2B364F | 0.033 |
| Tritanopia (no blue cones) | #004243 | 0.033 |
| Achromatopsia (no color) | #393939 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123D4F
#123D4F
oklch(34% 0.056 229.6)
- #4F2F1C
#4F2F1C
oklch(34% 0.056 50.7)
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 #123D4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.011
- Dark Blue Grey #1F3B4D ΔE 0.012
- Prussian Blue #1D3557 ΔE 0.034
- Charcoal #264653 ΔE 0.038
- Gunmetal #293241 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.043
- Onyx #343A40 ΔE 0.044
- Marine Blue #01386A ΔE 0.054
Use #123D4F 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.