#123E79
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.111 257.3), rgb(18, 62, 121).
Aa
White text reads best on this color (10.54:1).
About this color
#123E79 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.111 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.014 away. White text reads best on it, at 10.54:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.54:1 |
Values
| HEX | #123E79 |
| RGB | rgb(18, 62, 121) |
| HSL | hsl(214, 74%, 27%) |
| OKLCH | oklch(37% 0.111 257.3) |
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 #123E79 | 10.54:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #123E79 | 1.99:1 | Fails | Lc 9.9 | Not readable |
| #123E79 text on white | 10.54:1 | AAA | Lc 94.0 | Preferred for body text |
| #123E79 text on black | 1.99:1 | Fails | Lc -8.5 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF8
oklch(88.5% 0.046 256.5)
-
Step 300
300
#9FC3F7
oklch(81% 0.084 257.5)
-
Step 400
400
#69A2F3
oklch(70.8% 0.134 257.3)
-
Step 500
500
#3E88EE
oklch(63.1% 0.17 257.2)
-
Step 600
600
#176FDD
oklch(55.7% 0.186 257.3)
-
Step 700
700
#065CC0
oklch(49.2% 0.173 257.3)
-
Step 800
800
#0C4C9B
oklch(42.8% 0.143 257.1)
-
Step 900
900 (this color)
#123E79
oklch(37% 0.111 257.3)
-
Step 950
950
#0D2648
oklch(27% 0.07 257)
#123E79 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) | #1D447B | 0.021 |
| Deuteranopia (no green cones) | #003B78 | 0.014 |
| Tritanopia (no blue cones) | #004C55 | 0.085 |
| Achromatopsia (no color) | #3F3F3F | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123E79
#123E79
oklch(37% 0.111 257.3)
- #563900
#563900
oklch(36.9% 0.077 76.9)
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 #123E79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.014
- Marine Blue #01386A ΔE 0.033
- Cobalt #1E488F ΔE 0.047
- Light Navy #155084 ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.061
- Marine #042E60 ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.066
Use #123E79 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.