#123F6D
Closest named color: Twilight Blue (#0A437A). oklch(36.4% 0.093 252.4), rgb(18, 63, 109).
Aa
White text reads best on this color (10.72:1).
About this color
#123F6D is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.093 and its hue 252°. 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 10.72:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.72:1 |
Values
| HEX | #123F6D |
| RGB | rgb(18, 63, 109) |
| HSL | hsl(210, 72%, 25%) |
| OKLCH | oklch(36.4% 0.093 252.4) |
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 #123F6D | 10.72:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #123F6D | 1.95:1 | Fails | Lc 9.4 | Not readable |
| #123F6D text on white | 10.72:1 | AAA | Lc 94.5 | Preferred for body text |
| #123F6D text on black | 1.95:1 | Fails | Lc -8.1 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#A1C4ED
oklch(80.9% 0.069 252.7)
-
Step 400
400
#6CA4E4
oklch(70.6% 0.111 252.6)
-
Step 500
500
#418CDC
oklch(63% 0.142 252.3)
-
Step 600
600
#1B74CA
oklch(55.5% 0.155 252.5)
-
Step 700
700
#0961AF
oklch(49.1% 0.144 252.5)
-
Step 800
800
#0F508E
oklch(42.8% 0.119 252.4)
-
Step 900
900 (this color)
#123F6D
oklch(36.4% 0.093 252.4)
-
Step 950
950
#0F2742
oklch(26.9% 0.059 253.1)
#123F6D 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) | #29426F | 0.025 |
| Deuteranopia (no green cones) | #1A3A6C | 0.015 |
| Tritanopia (no blue cones) | #004A50 | 0.070 |
| Achromatopsia (no color) | #3E3E3E | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123F6D
#123F6D
oklch(36.4% 0.093 252.4)
- #573600
#573600
oklch(36.4% 0.078 71.8)
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 #123F6D, 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 0.026
- Prussian Blue #1D3557 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.055
- Marine #042E60 ΔE 0.057
- Charcoal #264653 ΔE 0.058
- Midnight Green #073B4C ΔE 0.059
Use #123F6D 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.