#123B63
Closest named color: Marine Blue (#01386A). oklch(34.6% 0.083 251.1), rgb(18, 59, 99).
Aa
White text reads best on this color (11.46:1).
About this color
#123B63 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.083 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.020 away. White text reads best on it, at 11.46:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.83:1 |
| White text | 11.46:1 |
Values
| HEX | #123B63 |
| RGB | rgb(18, 59, 99) |
| HSL | hsl(210, 69%, 23%) |
| OKLCH | oklch(34.6% 0.083 251.1) |
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 #123B63 | 11.46:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #123B63 | 1.83:1 | Fails | Lc 7.8 | Not readable |
| #123B63 text on white | 11.46:1 | AAA | Lc 96.1 | Preferred for body text |
| #123B63 text on black | 1.83:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A3C4E8
oklch(80.8% 0.062 250.8)
-
Step 400
400
#71A5DD
oklch(70.8% 0.099 251.1)
-
Step 500
500
#498DD4
oklch(63.1% 0.128 251.4)
-
Step 600
600
#2776C1
oklch(55.7% 0.139 251)
-
Step 700
700
#1963A7
oklch(49.2% 0.129 251.1)
-
Step 800
800
#185187
oklch(42.8% 0.107 251)
-
Step 900
900 (this color)
#123B63
oklch(34.6% 0.083 251.1)
-
Step 950
950
#11283F
oklch(27.1% 0.052 250.3)
#123B63 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) | #283E65 | 0.026 |
| Deuteranopia (no green cones) | #1C3662 | 0.016 |
| Tritanopia (no blue cones) | #00444A | 0.061 |
| Achromatopsia (no color) | #393939 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123B63
#123B63
oklch(34.6% 0.083 251.1)
- #513200
#513200
oklch(34.6% 0.074 71.8)
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 #123B63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.020
- Prussian Blue #1D3557 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.040
- Twilight Blue #0A437A ΔE 0.043
- Midnight Green #073B4C ΔE 0.043
- Marine #042E60 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.049
- Charcoal #264653 ΔE 0.055
Use #123B63 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.