#12255B
Closest named color: Marine (#042E60). oklch(28.6% 0.1 265.7), rgb(18, 37, 91).
Aa
White text reads best on this color (14.56:1).
About this color
#12255B is a dark, moderately saturated blue. In OKLCH its lightness is 29%, its chroma 0.100 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.027 away. White text reads best on it, at 14.56:1.
| Hue family | Blues |
| Lightness | dark (29%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.44:1 |
| White text | 14.56:1 |
Values
| HEX | #12255B |
| RGB | rgb(18, 37, 91) |
| HSL | hsl(224, 67%, 21%) |
| OKLCH | oklch(28.6% 0.1 265.7) |
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 #12255B | 14.56:1 | AAA | Lc -104.0 | Preferred for body text |
| Black text on #12255B | 1.44:1 | Fails | Lc 0.0 | Not readable |
| #12255B text on white | 14.56:1 | AAA | Lc 101.0 | Preferred for body text |
| #12255B text on black | 1.44:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#2E5EFF
oklch(55.7% 0.244 265.6)
-
Step 700
700
#1E46E8
oklch(49% 0.245 265.7)
-
Step 800
800
#193CBB
oklch(42.7% 0.202 265.5)
-
Step 900
900
#193694
oklch(37.8% 0.158 265.7)
-
Step 950
950 (this color)
#12255B
oklch(28.6% 0.1 265.7)
#12255B 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) | #002C5D | 0.022 |
| Deuteranopia (no green cones) | #00265A | 0.015 |
| Tritanopia (no blue cones) | #00323C | 0.078 |
| Achromatopsia (no color) | #292929 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12255B
#12255B
oklch(28.6% 0.1 265.7)
- #372800
#372800
oklch(28.7% 0.059 86.8)
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 #12255B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.027
- Midnight Blue #191970 ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.054
- Marine Blue #01386A ΔE 0.059
- Oxford Blue #1B263B ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.065
- Space Cadet #2B2D42 ΔE 0.067
- Darkblue #030764 ΔE 0.070
Use #12255B 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.