#123756
Closest named color: Prussian Blue (#1D3557). oklch(32.7% 0.069 247.3), rgb(18, 55, 86).
Aa
White text reads best on this color (12.30:1).
About this color
#123756 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.069 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.012 away. White text reads best on it, at 12.30:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.70:1 |
| White text | 12.30:1 |
Values
| HEX | #123756 |
| RGB | rgb(18, 55, 86) |
| HSL | hsl(207, 65%, 20%) |
| OKLCH | oklch(32.7% 0.069 247.3) |
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 #123756 | 12.30:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #123756 | 1.70:1 | Fails | Lc 0.0 | Not readable |
| #123756 text on white | 12.30:1 | AAA | Lc 97.8 | Preferred for body text |
| #123756 text on black | 1.70:1 | Fails | Lc 0.0 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CBDBEC
oklch(88.5% 0.029 249.8)
-
Step 300
300
#A7C4E1
oklch(80.8% 0.052 248.5)
-
Step 400
400
#76A6D2
oklch(70.8% 0.083 246.9)
-
Step 500
500
#518FC6
oklch(63.2% 0.105 247.1)
-
Step 600
600
#3278B3
oklch(55.6% 0.115 247.3)
-
Step 700
700
#24659A
oklch(49.2% 0.107 247.1)
-
Step 800
800
#20527D
oklch(42.7% 0.089 247.7)
-
Step 900
900 (this color)
#123756
oklch(32.7% 0.069 247.3)
-
Step 950
950
#14283B
oklch(27% 0.044 248.6)
#123756 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) | #293857 | 0.026 |
| Deuteranopia (no green cones) | #1F3255 | 0.019 |
| Tritanopia (no blue cones) | #003E42 | 0.050 |
| Achromatopsia (no color) | #353535 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123756
#123756
oklch(32.7% 0.069 247.3)
- #4C2D03
#4C2D03
oklch(32.9% 0.07 67.9)
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 #123756, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.012
- Midnight Green #073B4C ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.027
- Marine Blue #01386A ΔE 0.035
- Marine #042E60 ΔE 0.039
- Gunmetal #293241 ΔE 0.042
- Space Cadet #2B2D42 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.057
Use #123756 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.