#123D71
Closest named color: Twilight Blue (#0A437A). oklch(36.1% 0.101 255.5), rgb(18, 61, 113).
Aa
White text reads best on this color (10.87:1).
About this color
#123D71 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 Twilight Blue (#0A437A), ΔE 0.021 away. White text reads best on it, at 10.87:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #123D71 |
| RGB | rgb(18, 61, 113) |
| HSL | hsl(213, 73%, 26%) |
| OKLCH | oklch(36.1% 0.101 255.5) |
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 #123D71 | 10.87:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #123D71 | 1.93:1 | Fails | Lc 9.1 | Not readable |
| #123D71 text on white | 10.87:1 | AAA | Lc 94.8 | Preferred for body text |
| #123D71 text on black | 1.93:1 | Fails | Lc -7.8 | 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
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C3F2
oklch(80.8% 0.077 255.9)
-
Step 400
400
#6CA3EB
oklch(70.7% 0.121 255.6)
-
Step 500
500
#428AE5
oklch(63.2% 0.155 255.6)
-
Step 600
600
#1D72D3
oklch(55.7% 0.168 255.4)
-
Step 700
700
#0E5FB7
oklch(49.2% 0.157 255.5)
-
Step 800
800
#114E94
oklch(42.8% 0.13 255.5)
-
Step 900
900 (this color)
#123D71
oklch(36.1% 0.101 255.5)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#123D71 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) | #224273 | 0.023 |
| Deuteranopia (no green cones) | #0F3970 | 0.013 |
| Tritanopia (no blue cones) | #004951 | 0.076 |
| Achromatopsia (no color) | #3D3D3D | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123D71
#123D71
oklch(36.1% 0.101 255.5)
- #543700
#543700
oklch(36.2% 0.076 76.1)
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 #123D71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.021
- Marine Blue #01386A ΔE 0.023
- Prussian Blue #1D3557 ΔE 0.047
- Marine #042E60 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.057
- Cobalt #1E488F ΔE 0.059
- Light Navy #155084 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.063
Use #123D71 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.