#12436F
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.091 249.9), rgb(18, 67, 111).
Aa
White text reads best on this color (10.20:1).
About this color
#12436F is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.091 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.019 away. White text reads best on it, at 10.20:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.05:1 |
| White text | 10.20:1 |
Values
| HEX | #12436F |
| RGB | rgb(18, 67, 111) |
| HSL | hsl(208, 72%, 25%) |
| OKLCH | oklch(37.5% 0.091 249.9) |
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 #12436F | 10.20:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #12436F | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #12436F text on white | 10.20:1 | AAA | Lc 93.3 | Preferred for body text |
| #12436F text on black | 2.05:1 | Fails | Lc -9.2 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#9FC5EC
oklch(80.9% 0.069 249.4)
-
Step 400
400
#69A5E2
oklch(70.6% 0.11 250)
-
Step 500
500
#3C8EDA
oklch(63.2% 0.139 249.6)
-
Step 600
600
#0E76C8
oklch(55.6% 0.152 250)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#06518C
oklch(42.8% 0.117 249.9)
-
Step 900
900 (this color)
#12436F
oklch(37.5% 0.091 249.9)
-
Step 950
950
#0D2841
oklch(27% 0.057 249.3)
#12436F 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) | #2E4671 | 0.030 |
| Deuteranopia (no green cones) | #203D6E | 0.019 |
| Tritanopia (no blue cones) | #004E53 | 0.068 |
| Achromatopsia (no color) | #414141 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12436F
#12436F
oklch(37.5% 0.091 249.9)
- #5C3800
#5C3800
oklch(37.5% 0.081 70)
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 #12436F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.019
- Marine Blue #01386A ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.043
- Light Navy #155084 ΔE 0.049
- Prussian Blue #1D3557 ΔE 0.054
- Charcoal #264653 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.055
- Cobalt #1E488F ΔE 0.056
Use #12436F 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.