#123C70
Closest named color: Marine Blue (#01386A). oklch(35.8% 0.101 255.9), rgb(18, 60, 112).
Aa
White text reads best on this color (11.01:1).
About this color
#123C70 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.101 and its hue 256°. 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 11.01:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.01:1 |
Values
| HEX | #123C70 |
| RGB | rgb(18, 60, 112) |
| HSL | hsl(213, 72%, 25%) |
| OKLCH | oklch(35.8% 0.101 255.9) |
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 #123C70 | 11.01:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #123C70 | 1.90:1 | Fails | Lc 8.8 | Not readable |
| #123C70 text on white | 11.01:1 | AAA | Lc 95.1 | Preferred for body text |
| #123C70 text on black | 1.90:1 | Fails | Lc -7.5 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A1C3F2
oklch(80.9% 0.076 256.6)
-
Step 400
400
#6CA3EB
oklch(70.7% 0.121 255.6)
-
Step 500
500
#438AE5
oklch(63.2% 0.155 255.8)
-
Step 600
600
#2071D3
oklch(55.5% 0.169 256.1)
-
Step 700
700
#115EB7
oklch(49.1% 0.157 256.1)
-
Step 800
800
#134E94
oklch(42.8% 0.129 255.8)
-
Step 900
900 (this color)
#123C70
oklch(35.8% 0.101 255.9)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#123C70 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) | #214172 | 0.022 |
| Deuteranopia (no green cones) | #0D386F | 0.013 |
| Tritanopia (no blue cones) | #004850 | 0.076 |
| Achromatopsia (no color) | #3C3C3C | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123C70
#123C70
oklch(35.8% 0.101 255.9)
- #533600
#533600
oklch(35.8% 0.075 75.7)
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 #123C70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.020
- Twilight Blue #0A437A ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.045
- Marine #042E60 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.061
- Cobalt #1E488F ΔE 0.062
- Midnight Green #073B4C ΔE 0.065
Use #123C70 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.