#123B6B
Closest named color: Marine Blue (#01386A). oklch(35.2% 0.095 254.8), rgb(18, 59, 107).
Aa
White text reads best on this color (11.26:1).
About this color
#123B6B is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.095 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.015 away. White text reads best on it, at 11.26:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #123B6B |
| RGB | rgb(18, 59, 107) |
| HSL | hsl(212, 71%, 25%) |
| OKLCH | oklch(35.2% 0.095 254.8) |
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 #123B6B | 11.26:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #123B6B | 1.86:1 | Fails | Lc 8.2 | Not readable |
| #123B6B text on white | 11.26:1 | AAA | Lc 95.7 | Preferred for body text |
| #123B6B text on black | 1.86:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3EE
oklch(80.8% 0.071 255.2)
-
Step 400
400
#6EA3E6
oklch(70.6% 0.114 254.8)
-
Step 500
500
#468BDF
oklch(63.2% 0.145 254.7)
-
Step 600
600
#2473CD
oklch(55.7% 0.158 254.8)
-
Step 700
700
#1560B1
oklch(49.1% 0.146 254.6)
-
Step 800
800
#154F8F
oklch(42.8% 0.121 254.3)
-
Step 900
900 (this color)
#123B6B
oklch(35.2% 0.095 254.8)
-
Step 950
950
#102743
oklch(27% 0.06 254.6)
#123B6B 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) | #233F6D | 0.022 |
| Deuteranopia (no green cones) | #13376A | 0.012 |
| Tritanopia (no blue cones) | #00464D | 0.072 |
| Achromatopsia (no color) | #3B3B3B | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123B6B
#123B6B
oklch(35.2% 0.095 254.8)
- #513400
#513400
oklch(35.1% 0.074 74.8)
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 #123B6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.015
- Twilight Blue #0A437A ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.037
- Marine #042E60 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.056
- Midnight Green #073B4C ΔE 0.057
- Charcoal #264653 ΔE 0.065
Use #123B6B 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.