#123B79
Closest named color: Twilight Blue (#0A437A). oklch(36.3% 0.115 259), rgb(18, 59, 121).
Aa
White text reads best on this color (10.89:1).
About this color
#123B79 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.115 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.023 away. White text reads best on it, at 10.89:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.92:1 |
| White text | 10.89:1 |
Values
| HEX | #123B79 |
| RGB | rgb(18, 59, 121) |
| HSL | hsl(216, 74%, 27%) |
| OKLCH | oklch(36.3% 0.115 259) |
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 #123B79 | 10.89:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #123B79 | 1.92:1 | Fails | Lc 9.1 | Not readable |
| #123B79 text on white | 10.89:1 | AAA | Lc 94.8 | Preferred for body text |
| #123B79 text on black | 1.92:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBFA
oklch(88.6% 0.048 258)
-
Step 300
300
#9FC2F9
oklch(80.8% 0.087 259.3)
-
Step 400
400
#6AA1F6
oklch(70.8% 0.138 258.8)
-
Step 500
500
#4086F2
oklch(63% 0.177 259)
-
Step 600
600
#1D6DE1
oklch(55.6% 0.192 258.9)
-
Step 700
700
#0F5AC3
oklch(49.1% 0.178 259)
-
Step 800
800
#114A9E
oklch(42.7% 0.148 259.1)
-
Step 900
900 (this color)
#123B79
oklch(36.3% 0.115 259)
-
Step 950
950
#0E2549
oklch(26.8% 0.073 259.1)
#123B79 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) | #16427B | 0.021 |
| Deuteranopia (no green cones) | #003878 | 0.015 |
| Tritanopia (no blue cones) | #004A54 | 0.088 |
| Achromatopsia (no color) | #3D3D3D | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123B79
#123B79
oklch(36.3% 0.115 259)
- #533800
#533800
oklch(36.3% 0.075 78.5)
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 #123B79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.023
- Marine Blue #01386A ΔE 0.030
- Cobalt #1E488F ΔE 0.053
- Marine #042E60 ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.059
- Light Navy #155084 ΔE 0.063
- Dark Grey Blue #29465B ΔE 0.072
- Deep Sea Blue #015482 ΔE 0.073
Use #123B79 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.