#123B81
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.127 260.5), rgb(18, 59, 129).
Aa
White text reads best on this color (10.66:1).
About this color
#123B81 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.127 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.66:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.66:1 |
Values
| HEX | #123B81 |
| RGB | rgb(18, 59, 129) |
| HSL | hsl(218, 76%, 29%) |
| OKLCH | oklch(36.9% 0.127 260.5) |
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 #123B81 | 10.66:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #123B81 | 1.96:1 | Fails | Lc 9.7 | Not readable |
| #123B81 text on white | 10.66:1 | AAA | Lc 94.2 | Preferred for body text |
| #123B81 text on black | 1.96:1 | Fails | Lc -8.3 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFD
oklch(93.7% 0.027 260.3)
-
Step 200
200
#C5DAFD
oklch(88.4% 0.054 260.6)
-
Step 300
300
#9DC2FE
oklch(80.9% 0.094 259.9)
-
Step 400
400
#679FFE
oklch(70.6% 0.152 260.4)
-
Step 500
500
#3D83FD
oklch(63.1% 0.195 260.6)
-
Step 600
600
#1A69EC
oklch(55.6% 0.211 260.5)
-
Step 700
700
#0B56CD
oklch(49% 0.197 260.6)
-
Step 800
800
#0E47A6
oklch(42.6% 0.164 260.6)
-
Step 900
900 (this color)
#123B81
oklch(36.9% 0.127 260.5)
-
Step 950
950
#0D254D
oklch(27.1% 0.08 260.1)
#123B81 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) | #074383 | 0.022 |
| Deuteranopia (no green cones) | #003980 | 0.012 |
| Tritanopia (no blue cones) | #004C58 | 0.097 |
| Achromatopsia (no color) | #3E3E3E | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123B81
#123B81
oklch(36.9% 0.127 260.5)
- #543A00
#543A00
oklch(36.9% 0.076 80.3)
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 #123B81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.042
- Cobalt #1E488F ΔE 0.045
- Light Navy #155084 ΔE 0.062
- Marine #042E60 ΔE 0.069
- Sapphire #2138AB ΔE 0.071
- Dark Slate Blue #483D8B ΔE 0.072
- Prussian Blue #1D3557 ΔE 0.072
Use #123B81 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.