#123D79
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.113 257.9), rgb(18, 61, 121).
Aa
White text reads best on this color (10.66:1).
About this color
#123D79 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.113 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.017 away. White text reads best on it, at 10.66:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.66:1 |
Values
| HEX | #123D79 |
| RGB | rgb(18, 61, 121) |
| HSL | hsl(215, 74%, 27%) |
| OKLCH | oklch(36.7% 0.113 257.9) |
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 #123D79 | 10.66:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #123D79 | 1.96:1 | Fails | Lc 9.6 | Not readable |
| #123D79 text on white | 10.66:1 | AAA | Lc 94.3 | Preferred for body text |
| #123D79 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9FC3F7
oklch(81% 0.084 257.5)
-
Step 400
400
#69A1F4
oklch(70.6% 0.136 258.1)
-
Step 500
500
#3F87F0
oklch(63.1% 0.174 258.1)
-
Step 600
600
#196EDE
oklch(55.6% 0.188 257.9)
-
Step 700
700
#095BC1
oklch(49.1% 0.175 258)
-
Step 800
800
#0E4B9C
oklch(42.7% 0.145 258)
-
Step 900
900 (this color)
#123D79
oklch(36.7% 0.113 257.9)
-
Step 950
950
#0E2649
oklch(27.1% 0.072 258)
#123D79 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) | #1B437B | 0.020 |
| Deuteranopia (no green cones) | #003A78 | 0.014 |
| Tritanopia (no blue cones) | #004B55 | 0.085 |
| Achromatopsia (no color) | #3E3E3E | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123D79
#123D79
oklch(36.7% 0.113 257.9)
- #553900
#553900
oklch(36.8% 0.077 77.9)
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 #123D79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.017
- Marine Blue #01386A ΔE 0.032
- Cobalt #1E488F ΔE 0.049
- Light Navy #155084 ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.060
- Marine #042E60 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.068
- Deep Sea Blue #015482 ΔE 0.068
Use #123D79 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.