#123156
Closest named color: Prussian Blue (#1D3557). oklch(31.1% 0.076 254.6), rgb(18, 49, 86).
Aa
White text reads best on this color (13.12:1).
About this color
#123156 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.076 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.019 away. White text reads best on it, at 13.12:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.59:1 |
| White text | 13.12:1 |
Values
| HEX | #123156 |
| RGB | rgb(18, 49, 86) |
| HSL | hsl(213, 65%, 20%) |
| OKLCH | oklch(31.1% 0.076 254.6) |
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 #123156 | 13.12:1 | AAA | Lc -102.5 | Preferred for body text |
| Black text on #123156 | 1.59:1 | Fails | Lc 0.0 | Not readable |
| #123156 text on white | 13.12:1 | AAA | Lc 99.2 | Preferred for body text |
| #123156 text on black | 1.59:1 | 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 950.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DEEBFC
oklch(93.5% 0.027 255.1)
-
Step 200
200
#C3DBFA
oklch(88.4% 0.05 254.9)
-
Step 300
300
#99C4FA
oklch(80.9% 0.09 254.4)
-
Step 400
400
#5EA3F8
oklch(70.8% 0.144 254.6)
-
Step 500
500
#2689F5
oklch(63.2% 0.184 254.5)
-
Step 600
600
#0071D9
oklch(55.6% 0.181 254.6)
-
Step 700
700
#005FB8
oklch(49.1% 0.16 254.6)
-
Step 800
800
#004D98
oklch(42.6% 0.139 254.8)
-
Step 900
900
#03407F
oklch(37.6% 0.121 254.9)
-
Step 950
950 (this color)
#123156
oklch(31.1% 0.076 254.6)
#123156 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) | #203457 | 0.019 |
| Deuteranopia (no green cones) | #152D55 | 0.012 |
| Tritanopia (no blue cones) | #003A3F | 0.059 |
| Achromatopsia (no color) | #303030 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #123156
#123156
oklch(31.1% 0.076 254.6)
- #442B00
#442B00
oklch(31.2% 0.066 74.8)
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 #123156, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.019
- Marine #042E60 ΔE 0.024
- Marine Blue #01386A ΔE 0.038
- Midnight Green #073B4C ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.045
- Gunmetal #293241 ΔE 0.047
- Oxford Blue #1B263B ΔE 0.055
Use #123156 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.